HW 10 SA1 206 HWsolvers
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Transcript of HW 10 SA1 206 HWsolvers
HW-10-SA1-206-HWsolvers Release Notes
HW-10-SA1-206-HWsolvers provides updates to the HyperWorks solver suite. This update replaces the HW-10-
SA1-205-HWsolvers update.
RADIOSS Finite element solver for linear and non-linear problems
MotionSolve Multi-body dynamics solver
OptiStruct Design and optimization software using finite elements and multi-body dynamics
HyperXtrude An hp-adaptive finite element for material flow and heat transfer problems in
extrusion and rolling applications
RADIOSS
RADIOSS is a state-of-the-art finite element solver uniting implicit and explicit integration schemes for the solution
of a wide variety of engineering problems, from linear statics and linear dynamics to complex nonlinear transient
dynamics and mechanical systems. This robust, multidisciplinary solver enables designers to maximize
performance related to durability, NVH, crash, safety, manufacturability, and fluid-structure interaction, in order to
bring innovative products to market faster.
RADIOSS 10-SA1-206 again brings much advancement over previous versions, with emphasis in the areas of
performance, frequency response analysis, acoustic response analysis, fatigue analysis, and contact modeling.
RADIOSS Bulk Data Format
New Features
Complex Eigenvalue analysis - The modal method of complex eigenvalue analysis is now available.
- K2PP, CMETHOD and EIGC entries have been added to facilitate this
solution type.
- The presence of the CMETHOD and METHOD data selectors within a
subcase indicate the modal complex eigenvalue solution is required.
Memory trim for AMLS
eigenvalue solution - Memory is released back to the operating system while invoking
AMLS for eigenvalue analysis.
This feature is termed ―Memory Trim‖ and may be deactivated using
PARAM,MEMTRIM,NO.
- AMLS is an external program that requires its own memory and disk
space to perform eigenvalue analysis. Without memory trim, the total
memory requirement (T) to perform eigenvalue analysis using AMLS
was the sum of the memory required by RADIOSS (R), the memory
exclusively allocated for AMLS (A) and other miscellaneous memory
requirements; e.g. MIO library requirement, (M). Thus:
T = R + A + M.
With memory trim enabled, the total memory requirement is reduced
to:
T = max(R,A) + M.
- Memory trim is available only on Windows, LINUX and AIX operating
systems.
Hash-table based assembly
method - An alternative method for assembling global matrices in FEA analyses
is now available. This alternative method lowers the memory
requirement for matrix assembly and may be activated by
PARAM,HASHASSM,YES.
- The hash-table based assembly method reduces the memory
requirement of the assembly module by about a factor of 3 for linear
static analyses, by about a factor of 5 for eigenvalue analyses, and by
about a factor of 7 for frequency response analyses involving material
damping.
- The reduction in the overall memory requirement is problem-
dependant. For problems where modules other than the assembly
module are dictating the overall memory requirement, using this
alternative assembly method will not result in a reduction in the overall
memory requirement.
- Using the hash-table based assembly method while possibly reducing
memory requirements may result in longer run times.
Automatic filtering of results
output for acoustic simulation - A new output control, PEAKOUT, has been added that will
automatically filter results output for acoustic simulations. Through
PEAKOUT a frequency output set is automatically generated based
on a user-defined number of peaks.
Enforced displacements
supported with AMLS solver - Enforced displacements, velocities and accelerations, defined through
the SPCD input definition, are now fully compatible with the AMLS
eigenvalue solver.
Powerflow calculation - This is a post-processing option for FRF analysis, tracking the flow of
vibrational energy that travels in dynamically loaded structures. It
helps with identifying energy transmission paths, vibration sources,
and energy sinks.
- Both powerflow and structural intensity (defined as powerflow per unit
area) results are available as output to the H3D file.
- The I/O Option, POWERFLOW, is used to activate this feature.
Directional mass for bushing
elements - Directional mass may now be defined on the PBUSH and PBUSHT
bushing property definitions.
- This behaves in a similar manner to directional stiffness and damping
options.
Acoustic sources - A new bulk data input, ACSRCE, is now available, allowing acoustic
sources to be represented by scalar loading functions. This removes
the need to model the structural details of devices such as audio
speakers.
Static element deformation - New functionality allowing for enforced axial deformation of one-
dimensional elements for static analysis is now available.
- The functionality is activated by including a new subcase information
entry (DEFORM) in the subcase definition. This subcase information
entry references a bulk data entry of the same name (DEFORM).
Element energy output - The output of Element Kinetic Energy (EKE) and Element Energy
Loss per Cycle (EDE) has been added.
A dmig option allows energies for external superelements to be written
to the .out file.
MATT1 in heat transfer
analysis - Added support for MATT1 for heat transfer solution sequence.
Enhancements
Binary output of grid
participation factors - PFGRID will now output grid participation factors to the H3D file.
Previously, these results were output to the punch file.
Output generalized mass and
stiffness - These are output for each eigenvalue to both .out and .op2 files. In
the .out file, two extra columns have been added to the
eigenvalue/frequency table providing the generalized mass and
stiffness.
Grid point stress for shells
output to MNF file - Grid point stresses are output for both solid and shell elements when
GPSTRESS output request is present in addition to the .mnf file
creation request (OUTPUT, ADAMSMNF).
Changed defaults for MODEL
output - Default for MODEL is NONE when CBN method is used for CMS run.
Output strain energy for
external superelements - Added dmig argument to ESE output request. Energies for external
superelements are written to the .out file.
Review unconnected
structures in HyperMesh - When AMLS fails to run due to unconnected structure in the model.
We will output HyperMesh command files allowing the user to review
the unconnected structures.
*.amls_unconnected.cmf for unconnected structure
*.amls_singularity.cmf for singular grids
Performance improvements
for DMIG generation runs - Several H3D DMIG output improvements have been implemented,
improving the speed and memory usage.
Performance improvements
for MIO on AIX - Several changes were made to the invoke script that will improve
performance with MIO on AIX operating system.
Performance improvements
for acoustic analysis - Adjustments were made to the solution process for acoustic analysis
problems resulting in reduced run-times.
Performance improvements
when using frequency
dependant bushings
- Adjustments were made to the look-up procedure for frequency
dependent bushings resulting in reduced run-times for problems using
PBUSHT input definitions.
Resolved Issues
Fatigue analysis - In version 10.0, if MAT1 cards with MATFAT extensions were not
listed in the input file, in ascending order, by MID, and were not listed
before all other MAT1 cards without MATFAT extensions, an error
termination occurred. This problem no longer occurs.
- The issue related to the processing of stress results for fatigue
analysis has been resolved. This issue was observed in problems
where insufficient RAM allocation required stress data to be stored in
scratch files.
- The repeat number for fatigue sequences now correctly takes effect
when linear super-positioning exists.
Modal participation and AMLS - Modal participation results are now correct when using the third party
AMLS eigenvalue solver.
SDISP output request - Modal participation displacement output (SDISP) to the PUNCH and
OUTPUT2 formats is now correct when the PHASE option is selected.
Structural modal participation
with AMLS - Previously, when running with AMLS, it was necessary to request
displacement output (DISPLACEMENT) for the same grid set for
which modal participation output is requested (PFMODE). This is no
longer necessary.
Limit number of viscous
resvec’s calculated - Too many viscous resvec's can slow down the solution time. A default
limit of 1000 is now established. This limit can be adjusted using
PARAM,MAXDAMP (default=1000). A WARNING message is issued
if MAXDAMP is exceeded and no viscous resvec's are calculated.
Large number of residual
vectors calculated for RBE3
elements when running with
AMLS
- Previously, when running with AMLS, if there was a need to calculate
a residual vector for the dependent degree-of-freedom of an RBE3,
we used to create a residual vector for each independent degree-of-
freedom. This issue was resolved by creating only one residual vector
at the dependent degree-of-freedom.
AMLS generic files written to
and read from AMLSDIR - Previously, the AMLS generic files were written to and read from the
current working directory, often resulting in poor i/o performance. This
issue is resolved and these files are now written to and read from the
AMLSDIR.
Temperature dependent
materials for CTRIA elements - Previously, the determination of the temperature dependent material
properties for CTRIA elements was incorrect. This issue is resolved
and the appropriate material properties are used.
Convection for tetra elements - Previously, there was an issue when convection was applied to side 2
of a tetra element. This issue is resolved.
Flexible body generation - Flexh3d and ADAMS mnf formats do not support local coordinate
systems.
Therefore CMS vectors are now output to these formats with
reference to the basic coordinate system only, instead of the grid’s
output coordinate system.
Requested in-core solution
running as min-core - Corrected undesired behavior where, for large models, a requested in-
core eigenvalue analysis was being run with min-core settings.
Internally generated inertia
relief MPCs being incorrectly
used with other subcases.
- In previous versions, if multiple subcases existed, without MPC
references, and where one subcase was using inertia relief; internally
generated MPCs (used for inertia relief) were incorrectly used in those
subcases that didn’t have an MPC reference.
Output - Numeric labels are now output correctly.
Complex eigenvalue analysis - Error message generated when CMETHOD is not referencing a valid
EIGC entry.
File compression - When performing input file compression (running RADIOSS with –
compress command line option) PCOMP definitions were being
written with negative material ids in previous versions.
CBAR - Gravity and centrifugal loading on CBARs with pin flags was incorrect
in previous versions.
New I/O Option Entries
K2PP - K2PP matrix selector has been added. Selects direct input stiffness
matrices, which are not included in normal modes.
POWERFLOW - POWERFLOW activates powerflow calculation and output.
PEAKOUT - The PEAKOUT command can be used in the I/O Options section to
create an automatic frequency set for output based on the number of
user-defined peaks.
New Subcase Information Entries
CMETHOD - Complex eigenvalue extraction data selector has been added. This
data selector references a EIGC bulk data entry.
DEFORM - Static element deformation data selector has been added. This data
selector references a DEFORM bulk data entry.
New Bulk Data Entries
EIGC - Complex eigenvalue extraction definition has been added.
ACSRCE - Acoustic source definition has been added. Only SLOAD references
are supported.
DEFORM - Static element deformation definition for 1D elements has been
added.
PARAM, MAXDAMP - Limits the number of viscous resvec’s calculated.
PARAM, AMLSASPC - Defines when AUTOSPC is performed when running with the external
eigenvalue solver, AMLS.
PARAM, AMLSUCON - Defines whether or not to automatically constrain out all unconnected
grids when running with the external eigenvalue solver, AMLS.
PARAM, FRIC - Defines a multiplier for K2PP matrix references.
PARAM, MEMTRIM - Activate/Deactivate memory trim when running with the external
eigenvalue solver, AMLS.
PARAM, NEGMASS - Defines whether or not to error out for negative diagonal mass or
inertia terms.
PARAM, HASHASSM - Defines whether or not to use hash-table based assembly method.
Enhanced I/O Option Entries
ESE - Added type and dmig arguments for ESE output control.
Enhanced Bulk Data Entries
PBUSH - Fields for directional masses have been added.
PBUSHT - Fields for mass vs. frequency table references have been added.
Known Issues
DTI,UNITS and superelement
generation - DTI,UNITS input is not supported with CMS nodal formulation.
An error message is generated when DTI,UNITS is present in an input
file requesting generation of CMS superelements.
Conversion factors used for
length, when generating
flexh3d output, are incorrect
- Flexh3d output is only valid with the length unit mm. Therefore we will
error out when units of length other than mm are defined.
PARAM,FLXHW10,YES may be added to the input to avoid this error
termination, but then the resulting flexh3d output is only valid when
used with other HyperWorks 10.0 products where the selected units of
length are the same.
RADIOSS Block Format
New Features
Couplings - RADIOSS to RADIOSS: Multi-domain. Allows you to couple two or
more RADIOSS runs; significant time savings could be obtained, in
case the domains have different time-steps.
- RADIOSS toMadymo MPP – indirect coupling improves scalability.
Elements - Spotweld with HEXA formulation with automatic time step adjustment;
specific material law and failure model is available.
- Spring with tabulated loading/unloading functions.
Contacts - General type20 contact: solves surface to surface, node to surface
and includes edge treatment. It is recommended for solids as it allows
zero-gap contact. It has a softer behavior than type7, which is
designed to solve particular situations where type7 was dropping time-
step or adding mass on nodes. It is available for explicit solution only.
For Non-Linear implicit solution type5 contact is available.
Kinematic conditions - RBE2 element – allows direct mapping of equivalent element in Bulk
Data format.
Materials and failure models - LAW59 (CONNECT) – Connection Material to model spotwelds,
welding lines, etc.
- LAW66 – Visco Elastic Plastic Piecewise Linear Material; allows
separate input for tension and compression; includes strain rate based
on plastic strain rate; it is compatible with /VISC (Prony series).
- LAW72 (HILL_MMC) – Anistropic Hill material law with a modified
Mohr fracture criteria.
- LAW76 – Semi Analytical Model for Polymers (SAMP) with user-
defined functions for the work-hardening portion for tension,
compression and shear (i.e. plastic strain vs. stress).
- LAW82 – Hyper elastic material law. It is compatible with solid
elements only and in can be used to model polymers and elastomers.
- VISC – Viscosity
- TH output for element group
Input/Output
Implicit - Direct data conversion from Bulk Data to Block for RBE2 and RBE3
elements
- New convergence criteria: displacement, force and energy
combination
- Improved performance: new line search method (for analysis W/O
contacts)
- Improved time step control:
1. Fix Points input
2. Divergence Criterion input
Enhancements
Contacts - /INTER/TYPE21 + Thermal conduction
- /INTER/TYPE7: new gap option (lgap=3) enabling gap to be defined
as a function of the mesh size
- /INTER/TYPE20: new flag (Fpenmax) enables releasing the contact if
the penetration is higher than user defined value.
- Improved performance.
/INTER/TYPE11 + /SURF/PART EXT + TETRA10
Materials and failure models - Fabric material (LAW58): initial time step is computed on reference
mesh instead of initial mesh.
- Viscosity (Prony series) is now available in hyper-elastic material
/MAT/OGDEN.
- /MAT/LAW5 + /FAIL/TENSSTRAIN
Input/Output - Reaction force on nodes submitted to BCs
- Pressure (/ANIM/VECT/PCONT) for Type18 Contact Interface
- Number of failed layers in ANIM file for solids
- Stress and strain tensors output for tetra4 and Irot=1
Airbags - Total strain formulation for shells allows you to obtain smoother and
more regular shape for deployed airbags when using Reference
Metrics and Small Strain (LAW19).
- /LAW58 + reference metrics + inflation time > 0 - The new flag ―Isens‖
allows to activate both reference metrics and inflation at a given time,
using the same sensor.
Implicit - Easier data conversion from Bulk Data to Block: RBE2 and RBE3 are
now available (both for implicit and explicit).
- New convergence criteria: Displacement, force and energy
combination
- Improved performance: New line search method
- Improved time step control: Fix point and divergence criterion
- Improved accuracy for buckling analysis: Pressure loading
- Scratch files management for BCS Solver.
- NLimplicit: Improved convergence using multi RBE2 with the same
master node + hierarchy.
Improved error messages.
Elements - Drilling DOF in QEPH shell element.
Performances - Advanced Mass Scaling: alternative solution to standard mass scaling
to reduce elapsed time
- XFEM for cracks propagation: performance improvements (CPU cost
significantly reduced)
- Improved Starter performances, especially for huge models (several
million elements).
Documentation - Input deck examples for material laws
New Starter Keywords
- /INTER/TYPE20 – general contact for single surface, surface to
surface, node to surface treatment, including edge treatment. Zero
gap is allowed; recommended for solids.
- /MAT/LAW59 (CONNECT) – Connection material that can be used to
model spotweld, welding line, glue or to model laminate plane for
composite material.
- /MAT/LAW66 – Visco Elastic Plastic Piecewise Linear Material
- /MAT/LAW72 (HILL_MMC) – Anistropic Hill material law with a
modified Mohr fracture criteria.
- /MAT/LAW76 – Semi Analytical Model for Polymers
- /MAT/LAW82 – Hyperelastic material law (modified Ogden law)
New Engine Keywords
- /ANIM/NODA – Generates animation files containing nodal scalar
data
- /IMPL/DIVERG/n – Divergence criterion input for better time step
control.
- /IMPL/DT/3 - Implicit Time Step Control based on Riks Method
- /IMPL/DT/FIXPOINT – Fix point user input for better time step control
- /IMPL/LSEARCH/n – Line search method improves performances
(analysis w/o contacts)
- /IMPL/LSEARCH/OFF – Deactivates line search for non linear implicit
analysis
- /IMPL/PSTIF/OFF – Deactivating load (pressure) stiffness matrix.
- /IMPL/SBCS/OUTCORE – Forces BCS (Boeing solver) to use
minimum in-core memory.
- /IMPL/SBCS/MSGLV – Specifies message level for BCS (Boeing
solver)
- /IMPL/SBCS/ORDER – Reordering method for BCS (Boeing solver)
- /IMPL/SHPON – Improves the convergence of implicit nonlinear
analysis with warped shell elements (QEPH)
- /IMPL/SHPOFF – Improves implicit nonlinear analysis performances
with warped shell elements (QEPH), if rigid rotations are small
- /QEPH/V11: QEPH bug fix (otherwise fixed in v11 only).
Other Keywords
- Multidomain
Modified Starter Keywords
- /MAT/LAW42 (OGDEN) – New flag for viscosity
- /SUBMODEL – Additional keywords supported
- /TH – Updated documentation to include the improved composites
post-treatment plus additional variables for output in /TH/ACCEL
- /INISHE/ORTHO or /INISH3/ORTHO - Describes the initialization of
orthotropy direction for shells element per element.
Modified Engine Keywords
- /ANIM/VECT/CONT2 – Tied contact forces output
- /DT/Eltyp/Keyword3/Iflag – Defines the Engine input for Advanced
Mass Scaling
- /IMPL/NONLIN/N – Non linear implicit solution
Resolved Issues
Contacts - Thermics + adaptivity + dynamic condensation
- Interface TYPE2 with master curvature (Spotflag=30)
- Interface TYPE20: automatic segment edges adjustment in case of
impact with solid element.
- Interface TYPE11 + TETRA10 + /SURF/PART/EXT
- TYPE7 and TYPE11 + Inact=6: non-zero initial contact forces
Elements - Solids with 16 and 20 nodes: possible Engine error
- /PROP/SPR_BEAM: error if 3
rd node is aligned with the spring.
Airbags - LAW19 + zero stress flag + reference metrics + SPMD: initial stress
was remaining even if the zero stress flag was activated. This could
lead to premature bag unfolding (before injector activation).
- The function defined in the vent holes were not time shifted when the
flag lttf was activated.
- FVMBAG + CPB,CPC different from zero.
Output - Plastic strain output for brick20, H8C, HSEPH, PA6 (thick
shell)+smstr>0
- Tensor output for Ishell=12 and MAT25
- Temperature and density for FVM
- Stress and strain TH output for solids (composites).
Rigid wall energy output.
- Too large size of Starter output file with Ipri=0
- Incomplete TH output with SPMD + SPH
Materials and failure models - /LAW58: low initial time step (it is now computed on reference mesh
instead of initial mesh)
- /LAW59 (hexa spotwelds) + failure
- /LAW65: corrections to prevent possible core dumps in RADIOSS
Engine
SOL_ORTH + SKEW/FRAME
- /LAW70: improved stability
- /XFEM: improved stability for fracture propogation
- /LAW38 + cutoff stress + Ismstr=10
- /LAW25 + Gamma_INI, Gamma_Max (delamination values).
- /LAW51: improved stability
- /LAW2 + Eps_Max: not active for /PROP/TYPE18
- /LAW72: incorrect strain values
Kinematic conditions - /DT/NODA/AMS + RBODY with imposed velocity or displacement
- /PROP/TYPE33 (KJOINT) + functions associated to translational
stiffness and viscosity coefficients
Initial state - Tetra4R (parabolic tetra)
Implicit - BSC solver does not run if scratch area is not defined: it now has the
same I/O as RADIOSS Bulk Data format.
- Error messages improved: incompatibility with /ADMESH, etc.
- Resolved convergence issue:
with spring-back after trimming
QEPH + orthotropic laws
SPMD + /TYPE2 + Ispot=1
- NLimplicit: /RWALL + mix solver (engine error)
- Beams + large rotations: incorrect stress
- Incorrect contact force (TYPE7, 10 and 11) in Anim output.
- Improved stability on WIN7.
Stamping analysis - The memory issue related to adapted meshes used in stamping
analysis that occasionally resulted in a core dump on WinXP 32-bit
and 64-bit platforms has been resolved.
MotionSolve
New Features/Enhancements
Script Usub Support - Matlab script
- Python script
Enhanced co-simulation - Robustness and performance were enhanced.
- Co-Sim API added for RTW and 3
rd party solver co-simulation.
- Higher order (up to 2
nd order hold) co-sim were added for enhanced
security.
Enhanced command support - Almost all model elements can be used as command.
Rigidified flexible body - Flexible body can be modeled as rigid by setting rigidified=‖TRUE‖.
- Rigidified flexible body can be turned to flexible body in subsequent
analysis (but not vice versa).
Adjustable global properties
for flexible body - Mass and inertia can be adjusted for flexible body in the XML file.
- Accessible from usub via MODSET function
Improved HSTIFF/NSTIFF
solution - Robustness and performance were enhanced.
Nodal velocity/ acceleration
support in H3D
Different units in FE and MBD
models are now supported - Different units can now be specified in the OS FE and MS MBD
model.
New Force_StateEqn or
YFORCE/YFOSUB element
Speed enhancement in the
solver - Quasi-static and transient analysis performance has been enhanced.
Resolved Issues
Initial velocity solution - Initial velocity solution has been upgraded and now outputs to log file.
IF expression - The problem when IF expression executing all three branches failed
when a non-execution branch evaluated an invalid expression at that
instant has been resolved. The issue was related to a case where IF
failed when evaluating failure on LOG(0), which is part of a branch
that is not supposed to be executed based on the IF values.
Single input single output
entities - The problem that occurred when multiple Single Input Single Output
entities existed in the model has been resolved.
DAE solver statistics - The issue related to DAE solver statistics resets after solver attempts
to restart an integration has been corrected.
SYSFNC(‘JOINT’) - SYSFNC('JOINT') called from usersub yielding 2x the joint reaction
force issue has been corrected.
Comma separated values - Differences no longer exist between 32 and 64 bit solutions when a
user sub utilizes a file with comma separated values.
Co-simulation - Co-simulation with MotionSolve has been significantly enhanced.
Improved IV solution - In a few cases, previous IV solution can produce spurious results. This
has been fixed.
- VM/WM support for models in ADM format is now available.
SYSFNC(‘FORCE’) called from
CONSUB or REQSUB without
- This was giving incorrect results and has been fixed.
iflag=1
RSPDP deactivate issue - Deactivate is not deactivate before since the action was not
deactivated.
PITCH angle sign issue fixed
Writing and translating large
files - There was a crash issue when writing huge MRF files (over 2 GB) and
translating to ABF and PLT files. This has been fixed.
OptiStruct
Altair OptiStruct is a finite element and multi-body dynamics software that can be used to design and optimize structures
and mechanical systems. OptiStruct uses the analysis capabilities of RADIOSS and MotionSolve to compute responses
for optimization.
Enhancements
Constraint screenings - When buckling responses are considered in an optimization problem, the
default for DOPTPRM, MAX_BUCK is now set at 15; a warning is issued
when DOPTPRM, MAX_BUCK is less than 15.
- When buckling responses are considered in an optimization problem, a
warning is issued when GBUCK is not defined and auto constraint screening
is active.
Design variable references
supported for MAT4 and MAT5 - Thermal materials MAT4 and MAT5 may now be referenced on DVMREL#
cards.
Resolved Issues
PSHELL material Optimization - MID1 is allowed to be not designed while MID2, MID3, and MID4 are.
Maximum Constraint Violation - Composite manufacturing constraints are now included for sizing
optimization.
Ply-based composite material
definition - For laminates of more than 9 plies, ply orientations are now correctly
identified as ply thicknesses by all output routines. Improper printing and
crashes when using OUTPUT, SZTOSH no longer occur.
- The mechanism used to detect designable properties whose values changed
during an optimization no longer fails for negative values (noticeably negative
orientations). The output of updated properties to the .prop file is no longer
affected.
- EXCLUDE option now works for elements referencing ply-based composite
material definitions.
Sensitivities - Minor correction made in the calculation of pressure sensitivities with direct
method.
- Corrected sizing sensitvity for thermal loading.
- Corrected gravity and centrifugal loading sensitivities on CBARs with pin
flags.
Material Sizing - Corrected behavior of DVMREL
DOPTPRM,SHAPEOPT,2 - Corrected behavior, related to alternative shape optimization algorithm, that
was, in some instances, causing the software to crash.
DLINK2 - Corrected behavior, related to DLINK2, that was causing the software to
crash on HP-UX ia64 platform.
HyperXtrude
New Features and Enhancements
Metal Extrusion
Bearing friction model - Updates to the bearing friction model to improve friction behavior at the die—
bearing region based on extrusion data of twenty five different profiles.
Flow stress plots - The H3D result file exported by the solver includes the flow stress data.
Loads on tool surfaces - It is no longer required to include a tool mesh in the analysis to get the loads
on the workpiece—tool interface for purpose of doing stress analysis using
RADIOSS. Even for models with just workpiece, HX will now export the
pressure loads on the workpiece—tool boundary faces. This file can be used
to map the loads on the tool mesh in the HyperXtrude user profile and to do
tool stress analysis using RADIOSS.
Strain computation - Modifications to strain computation to account for dead metal zone to
eliminate spurious high values in this region.
Viscoplastic friction model - Changes to the viscoplastic friction model improve the accuracy.
Bearing profile - Improvements to bearing profile friction computations improve the accuracy
of stick/slip behavior.
Weld strength - Exported H3D results file will include ―weld strength‖. The HyperXtrude solver
compares the pressure and flow stress data to predict this measure.
Nose cone prediction - Profile deformation analysis predicts the nose cone under steady state
analysis. However, the standard free surface analysis will be performed for
the transient analysis.
Improvements to temperature
prediction - Changes were implemented to avoid excessive heating due to stress work in
the bearing and profile region.
Files for automatic report
generation - The HyperXtrude solver automatically writes a file (*.rpt), which is used by
the HyperXtrude user profile for report generation.
Polymer Processing
Roller surface BC - A new boundary condition to model the extruded profile moving on a roller
surface moving/rotating at a specified speed has been introduced.
Viscosity plots - The H3D result file exported by the solver now includes the viscosity data.
Residence time - Results computed now include residence time.
Viscoelastic model - Criminale-Ericksen-Filbey model, which uses first and second normal stress
coefficients to consider effects of viscoelasticity, has been implemented. This
model is well suited for polymer extrusion.
General
Pressure prediction - A pressure smoothing step has been added to improve the quality of
pressure prediction in models made of non-hexahedral meshes.
Resolved Issues
Numerical instability - Numerical instability in solving the energy equation in advection dominated
flows is now removed.
Unit conversion error - Unit conversion error in the force balance table has been fixed.