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Valimat

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VALIMAT® is a software solution that guides you from test data to a validated material card for finite element simulations in a highly automated way.

Main characteristics

  • your solution to gain material cards for dynamic as well as static applications
  • stand-alone software or in combination with IMPETUS®
  • intuitive GUI
  • test and model database system (efficient organization of your tests)
  • test data
    • import of external measurement results
    • evaluation and filter possibilities
    • semi-automated evaluation for different load cases
  • modeling
    • integrated optimization process (LS-Opt©) – AutoFit process
    • integrated interfaces to FE-solvers (Abaqus©, LS-DYNA©, Pam-Crash©)
4a engineering Valimat

VALIMAT®

measured signals

  • acceleration signal shows the deceleration of the pendulum head because of the impact with the test specimen
  • angle signal is used for determination of the position of the pendulum arm resp. the test specimen
  • acceleration sensor on the support gives feedback of the impact time

evaluation

  • acceleration signal → force, velocity and displacement
  • angle signal → displacement

various filters can be used for evaluation

4a engineering Valimat

VALIMAT® can be run local or in a network cluster and supports the following FE solvers at the moment:

  • LS-Dyna® implicit / explicit
  • Abaqus® implicit / explicit
  • PAM-Crash® explicit

Automatic model setup for the following load cases is available:

  • Free 3-point-bending
  • Tension bending
  • Compression test
  • Puncture test
  • Free bending T-specimen
  • Component test
  • Tensile test
  • Shear Test

Further features:

  • consideration of symmetries (from full model down to 1-element-tests)
  • idealization in shell (quads) or solid (tet or hexa)
  • arbitrary but reasonable element size
  • selection of the most popular element types (under or fully integrated)
4a engineering Valimat

A wide range of common material models for all solvers are implemented in VALIMAT®. Of course all material models can be implemented by a user defined material card.

LS-DYNA©:
  • MAT_ELASTIC (*MAT_001)
  • MAT_PIECEWISE_LINEAR_PLASTICITY (*MAT_024)
  • MAT_PLASTICITY_COMPRESSION_TENSION (*MAT_124)
  • MAT_SAMP-1 (*MAT_187)
  • MAT_FU_CHANG_FOAM (*MAT_083)
  • MAT_COMPOSITE_DAMAGE(*MAT_022)
  • MAT_ENHANCED_COMPOSITE_DAMAGE (*MAT_054)
  • MAT_LAMINATED_COMPOSITE_FABRIC (*MAT_058)
  • MAT_RATE_SENSITIVE_COMPOSITE_FABRIC (*MAT_158)
  • MAT_LAMINATED_FRACTURE_DAIMLER_PINHO (*MAT_261)
  • MAT_LAMINATED_FRACTURE_DAIMLER_CAMANHO (*MAT_262)
  • MAT_ANISOTROPIC_ELASTIC_PLASTIC (*MAT_157)
  • MAT_MICROMEC (*MAT_215)
  • MAT_MICROMEC (*MAT_215)+Carbon
  • MAT_SIMPLIFIED_RUBBER/FOAM (*MAT_181)
  • MAT_SAMP_LIGHT (*MAT_187L)
ABAQUS©:
  • ELASTIC *PLASTIC
  • DRUCKER PRAGER
  • ABQ_MOLDED_PLASTIC (in progress)
  • ELASTIC, TYPE=ENGINEERING CONSTANTS
  • PLASTIC *POTENTIAL
  • ABQ_PLY_FABRIC *LOW DENSITY FOAM
PAM-CRASH©:
  • MATER_101
  • MATER_103
  • MMM user material (VW research)
  • MMM anisotropic user material (VW research)
  • Composite Plydata
  • MATER_1
  • MATER_45
  • MMATER

The determination of the parameters in the material card is done by reverse engineering which is fully automatically accessible in VALIMAT®. As example the validated results for a PC/ABS is shown. Detailed information for the process of material parameter identification by reverse engineering can be found in the corresponding references section.

4a engineering Valimat

MICROMEC®

By default composite materials are anisotropic. Therefore a lot of parameters are necessary to describe the properties of the composites. MICROMEC® enables a fast and easy determination of the material parameters for such composites. Also, a virtual material design is possible. By default, base of the calculation of the 3D thermo-elastic properties is the Mean-Field-Theory of Mori-Tanaka. In addition, the calculation can be done by 3D- laminate theory.

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Characteristics of MICROMEC®

  • Usage for SFRT, LFRT, CFRP, GFRP, ….
  • Calculation of the 3D elastic tensor as well as the thermal expansion tensor
  • Data bases for matrix materials, reinforcement orientation and shape (endless, long or short fibers, plate, sphere, …)
  • Consideration of fiber length distributions
  • Fibers can be isotropic or transversal-isotropic
  • Arbitrary combination of components and distributions
  • 3D and 2D graphical display of the Young’s Modulus and thermal expansion
  • 2D graphical comparison of materials
  • Export of material cards for LS-Dyna®, Simulia Abaqus® or Nastran
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