P 1145 - Evaluation of different tests for failure characterisation of high-strength sheet steel materials using finite element simulation
Simulation (P 1145) The research project, which was initiated and technically and partly financially supported by the working group "Characteristics for failure modelling" of the Materials Committee of the VDEh Steel …
Content
- Publication
- 2016
- Authors
- B.A. Behrens, I. Peshekhodov
Simulation (P 1145) The research project, which was initiated and technically and partly financially supported by the working group "Characteristics for failure modelling" of the Materials Committee of the VDEh Steel Institute, dealt with the evaluation of common tests for the failure characterisation of high-strength sheet steel materials using finite element simulation. The tests included the shear test on theASTM-like specimen, shear test on the Miyauchi-like specimen with groove and shear test on the butterfly-like specimen with loft for plane shear, three-point bending test on the flanged specimen and tensile test on the perforated specimen for uniaxial tension, Three-point bending test on the full specimen and tensile test on the waisted specimen for plane strain, as well as cupping tests on circular specimens with punches of Ø 20 mm and Ø 100 mm for equiaxial tension.
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A dual-phase steel of 600 MPa, a complex-phase steel of 1000 MPa and a press-hardenable steel of 1500 MPa, each 0.8 mm, 1.5 mm and 3.0 mm thick, were used to evaluate the tests. The flow behaviour was described using the Hill'48 criterion and isotropic strain-rate-dependent hardening. The failure behaviour was described using the CrachFEM models for ductile shear failure and ductile separation failure. It should be noted at this point that the failure behaviour of the test materials for the project was described by various test bodies using different test methods and evaluation approaches. For this reason, the materials should not be compared with each other on the basis of the failure descriptions used here. The sometimes contradictory differences in the deformation behaviour of the materials in no way affect the test assessments made here. Rather, they provide a good opportunity to point out that a standardisation of the test methods and their evaluations is absolutely essential for the correct application of the approaches used here to describe the failure behaviour in industrial practice. The samples were discretised with sufficiently small volume elements to allow for the localisation of field sizes and 3D stress states. The evaluation was performed based on the spatial distribution of the comparative deformation degree and the damage variable at the time of crack initiation as well as time variation of the stress and strain state at the location of crack initiation. The results show that it is not possible for any of the analysed stress states to apply a specific test to the entire variety of high-strength sheet steel materials and their thicknesses without reservations. and their thicknesses without reservations. However, for each of the stress states investigated, a test can be proposed that represents an acceptable compromise between its advantages and disadvantages and can therefore contribute to a suitable test selection for failure characterisation. For a good characterisation accuracy, however, some aspects remain, such as the exact determination of the degree of failure deformation or suitable assumption of the characteristic stress state at the location of crack initiation, remain open. Furthermore, the results reveal the need for suitable additional tests that enable the determination of deformation limits at stress states between plane shear and uniaxial tension. The research project P 1145 of FOSTA - Forschungsvereinigung Stahlanwendung e.V., Düsseldorf was carried out by the Institute of Forming Technology and Machines, University of Hanover with technical support and financial assistance from the Forschungsvereinigung Stahlanwendung e. V., Düsseldorf.
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P 1145 - Evaluation of different tests for failure characterisation of high-strength sheet steel materials using finite element simulation—
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