FEMAP Structural Analysis Toolkit for NASTRAN … 2006... · 1 FEMAP Structural Analysis Toolkit...

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FEMAP Structural Analysis

Toolkit for NASTRAN

Carl PoplawskyMaya Simulation Technologies

© 2006, MAYA HTT Ltd.2

Who is Maya Simulation Technologies?

� American subsidiary of Maya Heat Transfer

Technologies (Montreal)

� Offices in Boston, Dallas, and Phoenix

� MAYA is a UGS Foundation Partner (1984)

� Fully integrated software solutions for NX, I-

deas, and FEMAP

� MAYA-authored products are sold by UGS

and Maya worldwide

• NX Thermal / NX Flow

• I-deas TMG / I-deas ESC

• Laminates Module (I-deas & NX)

• FEMAP TMG / FEMAP Flow

• Structural Analysis Toolkit

• I-deas & NX ECAD/MCAD and FE

Translators

� Platinum Value-Added Reseller of UGS

� Engineering Consulting Services worldwide


Femap SA-Toolkit for NASTRAN

� Developed and sold directly by Maya

� Efficient post-processing of NASTRAN results� Ranking, sorting, enveloping, filtering� Summaries by groups, subcases� Margins of safety � Random and harmonic solutions from

NASTRAN normal modes results� Direct manipulation of .op2 file data from NX

NASTRAN and MSC.NASTRAN

� Extremely efficient for large models

� Automatic Report Generation� HTML, MS Excel®, Ascii


Femap SA-Toolkit suite

� Mass processor

� Stress processor

� Grid point force processor

� Element force processor

� Energy Processor

� Modal processor

� Sine processor

� Random processor


OS Support Summary

� Uses NASTRAN data directly from binary results file (op2)

• UNIX/WINDOWS/LINUX cross-platform binary file reading capability

� Toolkit OS platforms• Windows (from Femap APIs directly)

• Linux - 32/64 bit (standalone)


MS Excel report writer

�All processors write data directly to MS Excel• Automatic creation of sort keys to allow efficient manipulation

of data and analysis

• Special fonts and shadings to highlight key results like

negative margins

• Line, pie and bar graphs

M O D E S U M M A R Y

E ffec tive M ass F ilte r 1 .10%

R esp o n se F ilte r 30 .00 G S

M o d e F req (H z) M x(% ) M y(% ) M z(% ) R esp o n se L o ad C ase N o d e G ro u p N am e

1 10 .185 60 .40% 0 .00% 0 .00% 38 .27 1 6 A LL N O D E S

2 20 .372 0 .00% 0 .00% 60 .45% 38 .26 3 6 A LL N O D E S

3 61 .032 18 .95% 0 .00% 0 .00% 19 .31 1 6 A LL N O D E S

4 121 .308 0 .00% 0 .00% 19 .03% 19 .31 3 6 A LL N O D E S

5 164 .067 6 .45% 0 .00% 0 .00% 8 .97 1 6 A LL N O D E S

6 304 .130 3 .08% 0 .00% 0 .00% 6 .33 1 2 A LL N O D E S

7 322 .451 0 .00% 0 .00% 6 .46% 8 .97 3 6 A LL N O D E S

8 442 .152 1 .12% 0 .00% 0 .00% 3 .43 1 3 A LL N O D E S

9 586 .438 0 .00% 0 .00% 3 .02% 7 .37 2 6 A LL N O D E S

10 640 .168 0 .00% 79 .73% 0 .00% 31 .58 2 6 A LL N O D E S

11 835 .330 0 .00% 0 .00% 1 .03% 3 .30 3 3 A LL N O D E S

12 1857 .840 0 .00% 7 .70% 0 .00% 9 .79 2 6 A LL N O D E S

13 2893 .656 0 .00% 2 .00% 0 .00% 5 .83 2 2 A LL N O D E S

14 3646 .219 0 .00% 0 .52% 0 .00% 3 .67 2 6 A LL N O D E S

15 4041 .859 0 .00% 0 .05% 0 .00% 1 .27 2 6 A LL N O D E S

beam.inp

0.0%

10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

MODE

PE

RC

EN

T E

FF

EC

TIV

E M

AS

S

Mx (%)

My (%)

Mz (%)


Mass processor

�Best practice purpose: To efficiently alter the mass properties of large FE models to bring them back to actual mass levels

�Typically used to simulate the effects of non-structural mass

• Mass properties given by physical property and optionally by user-defined element groups

• Mass properties separated into structural and non structural

masses

• Accounts for lumped masses, 1-d, 2-d, 3-d and laminate

elements


Mass Processor


Stress processor

�Best practice purpose: To summarize margins of safety for many element groups, several subcases and different safety factors

� Supported failure theories:

• Von Mises, Laminates, Honeycomb Sandwich

� For each each group one can specify:• Factor of safety, Allowable Stress, MS threshold, Failure criteria

� Dynamic stresses are combined in a phase consistentfashion

� Resulting margins of safety can be graphically displayed in Femap


Stress processor – Different failure cases


Stress Processor

� Summary Worksheet– Summarize margins of safety for many element

groups, several Nastran subcases and different safety factors


Stress Processor

• Detailed MS Excel

Worksheets

– As many worksheets as there are combinations of subcases and user-defined stress cases


Composites and Sandwiches

• First ply failure, margins of safety using NASTRAN PCOMP output

• Facesheet instability (ref. NASA CR1457)

• Wrinkling

• Intracell buckling

• Shear crimping

• Facesheet Stresses

Stress Processor

Margins of Safety in Femap


Grid point force processor

�Best practice purpose: To synthesize forces on groups of elements in complex geometries, for several subcases

• Typically used for bolt and joints detailed hand calculations

• Also used for laminate/composite joint analyses

• Extract resulting forces at a grid point resulting from a user specified group of elements

• MPC, SPC forces and applied loads optionally considered

• Complex grid point forces are accounted for in frequency response analyses (SOL 108 and 111)

• Resulting forces may be in a coordinate system other then the grid displacement coordinate system


Grid Point Force / Joints


Element Force processor

�Best practice purpose: To efficiently summarize forces on elements for many element groups and several subcases, component by component

• Force output varies depending on element type

• Summaries make it easy to identify critical component and element

•Forces in material coordinate system


Element Force processor (springs)

123

=+ RaRs

• MS Excel output of spring forces

• Example of bolt margin

calculation in MS

Excel using

spring force data


Element Force processor (laminate shells)

• Uses modified NASTRAN solution sequence

• Query element forces in material coordinate system

• Important for laminates applications

• Core shear analysis


Modal processor

� Best practice purpose: To provide all information required in preparation of modal forced response analysis� For each mode

• Effective mass

• Maximum acceleration response estimation for excitation in all 3translational directions, for user-selected node groups

• Given a 1g base excitation over a bandwidth coincident with the modes

� Summary of all the modes that pass the following criteria:

• User-defined minimum effective mass

• User-defined minimum dynamic response

� Processes multiple load cases


Modal Processor


Energy processor

�Best practice purpose: To efficiently identify groups with high energy in complex models, on a mode by mode basis

• Compute both kinetic and strain energy


Random processor

�Best practice purpose: To efficiently analyze a structure subjected to random-type base excitation

• Provides a wizard type capability to perform a NASTRAN base excitation random analysis

• Uses the results from a NASTRAN eigenvalue analysis

• Simplified data entry compared to standard NASTRAN analysis

• PSD specified using typical power spectrum quantities

• Elements/nodes specified using groups

• All stress/force components processed for a given element

• Exact Von Mises stress calculation from Monte Carlo or Segalmanapproach


Random processor

• Corrects for modal truncation by considering residual flexibility

• Powerful Gauss-Kronrod numerical integration scheme

• Automatically picks integration points

• Alternate analytical integration approach

• Margins of safety calculated on groups of elements similar to the stress processor

• Resulting margins of safety can be displayed in Femap for graphical display

• Generate RMS and peak Von Mises stresses

• Html PSD plots generated for selected quantities

• PSD plots can be imported into excel or Femap for further processing


� Traditional Von Mises stress recovery

• Typical workaround of combining stress components can

result in overestimation of Von Mises stress

• Phasing is lost in this type of calculation

• Time consuming for large models

� SAToolkit computes exact Von Mises stress using

� Monte Carlo method

� Segalman method (default)

Random Processor


Random Processor User Interface


Random Processor

MS Excel output


Random Processor

HTML output

ASCII output


Sine processor

�Best practice purpose: To efficiently analyze a structure subjected to harmonic base excitation

• Similar to random processor

• Uses efficient modal approach with option to account for

modal truncation

• Phase-consistent Von Mises Stresses

• Stress tensor is complex

• Von Mises stress is a real value

• Maximum possible Von Mises stress is computed for any

phasing of the stress tensor components

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Thank You!www.mayasim.com

[email protected]

Booth 5005 (Design Expo)

FEMAP Structural Analysis Toolkit for NASTRAN … 2006... · 1 FEMAP Structural Analysis Toolkit...

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