Material Parameter Identification of Concrete by an Impact (Combination of RADIOSS & HyperStudy)
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Transcript of Material Parameter Identification of Concrete by an Impact (Combination of RADIOSS & HyperStudy)
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Material parameter identification of concrete by an impact
(Combination of Radioss & HyperStudy)
by
Vitali Almendinger
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Agenda
• Company/ Product introduction
• Hammer description
• Measurement/ Simulation principle
• Mesh Size/ Properties
• DOE
• Definition of design variables/ Specifications
• Definition of the responses: characteristic measures of test curve
• DOE results
• Optimization and results
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Company/ Product introduction
Today DEWALT is a leading brand of professional power tools in the world and
in the last 5 years the fastest growing power tool brand in the world.
Compact Hammers Mid Size Hammers Demolition Hammers
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Hammer description
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Initial Velocity
Gravity
Measurement Points
Measurement/ Simulation principle
BCS mid Nodes
DOF (0,0,1)
Equivalent
Nodes
BCS Block
DOF (0,0,0)
Ram
Drill
Concrete
Core
Concrete
Block
/MAT/LAW1
/MAT/LAW24
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Measurement/ Simulation principle V
elo
cit
y o
f R
am
[m
/s]
Velo
cit
y o
f D
rill [
m/s
]
Time [ms]
Time [ms]
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Measurement/ Simulation principle
Statistical
Reference
Curve Measurement
Curves
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Mesh Size/ Properties
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Mesh Size/ Properties
Mesh parameters
• Concrete parts only HEX-Mesh
• Concrete Core constant Mesh size of ̴ 0.3 mm
Properties
• Steel parts Isolid=24
(with Isolid=1, to much Hourglassenergy)
• Concrete parts must have Isolid=1
(with Isolid=24, to much damping)
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Definition of design variables/ Specifications
7 Design variables
• fc (Concrete uniaxial compression strength)
• ft/fc (Concrete tensile strength ratio)
• ν (Poisson’s ratio)
• Ht (Concrete data tensile tangent modulus)
• ky (Concrete plasticity initial value of
hardening parameter)
• Stfac Type20 Ram and Tool (Interface
stiffness scale factor)
• Stfac Type20 Tool Tip and Concrete Core
(Interface stiffness scale factor)
DOE Specifications
• Hammersley
• Number of runs: choose by default (36 runs)
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Definition of the responses: characteristic
measures of test curve
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Max. D
ista
nce
Curvature Length
Pen
e_m
ax
Slope
Response
• Maximum Penetration
• Curvature Length (at a node displacement of 0.15mm)
• Slope
• Max. Distance (of the time axis 6e-4s until 9e-4s)
• Ram velocity at the end
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DOE Results
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Max. D
ista
nce
Curvature Length
Pen
e_m
ax
Slope
Curvature
Length
Slope
Max.
Distance
Ram V_end
Pene_Max C
urv
atu
re
Len
gth
Stf
ac
_R
am
_To
ol
Ma
x.
Dis
tan
ce
Ram
V_
en
d
Pe
ne_
Ma
x
Ht
f c
Stf
ac
_T
ip_
Co
re
f t/f
c
ky
Po
iss
on
’s
rati
o
Slo
pe
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DOE Results /
Optimization
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Optimization
Design variables
• fc (Concrete uniaxial compression strength)
• ft/fc (Concrete tensile strength ratio)
•Stfac Type20 Ram and Tool (Interface stiffness scale factor)
• Stfac Type20 Tool Tip and Concrete Core (Interface stiffness scale factor)
Optimization Specification
• Genetic Algorithm
Statistical
Reference
Curve Start Values For
Optimization
DOE Result
Curves
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Optimization Result
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Thanks for Your Attention!