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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 12
SUMMARY:Systematic calibration and validation of failure models for crash simulation of advanced high strength steel sheets (AHSS) 
DESCRIPTION:AHSS are widely used in crashrelevant components of automotive structures. Because of their low ductility an accurate failure prediction is mandatory for this class of materials. Hence, in the past different complex failure models have been developed. The calibration of those failure models is usually based on experiments with defined stress states, partly at different strain rates. Though, there is still a lack of suitable experiments for the validation of those calibrated failure models from quasi-static up to crash relevant strain rates cover-ing different complex loading situations. These validation experiments should be suitable for a wide range of test speeds, lead to nearly plane stress states from compression/shear to multiaxial tension and should show characteristic damage. 
In this contribution experimental validation concepts were developed and applied to a DP1000 steel sheet and a ZStE 340 steel sheet. These validation experiments are appropriate for quasi-static and highspeed testing. The key of these validation tests is to develop specimens with different potential critical areas. De-pending on the failure behavior of the material, failure occurs in the shear or in the nearly plane strain re-gion. Especially the safety-critical negative strain rate effect concerning the shear failure strain of advanced high strength steel sheets can be validated by the proposed new material dependent shear-tensile validation test. The specimen geometries are designed depending on the ductility of the material and the manufactur-ing is performed without any joining procedure. Local failure initiation on the surface of the specimens is observed by highspeed video recording and verified by FE-simulations. With these experimental concepts the validation procedure of failure models can be performed cost-efficient and reliable over a wide range of stress states and strain rates. This leads to an improvement in failure prediction and utilization of the light-weight construction potential of AHSS sheets in automotive applications.
 
CLASS:PUBLIC
DTSTART:20230614T094000
DTEND:20230614T100000
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