Browse Publications Technical Papers 2019-26-0284
2019-01-19

Procedure for Material Failure Characterisation Through GISSMO 2019-26-0284

Vehicle crashworthiness is an important aspect of Vehicle development. Vehicle structural performance in crash plays a critical role in controlling the occupant injuries. During a crash event, vehicle energy management governs the structural performance and passenger compartment integrity. However, these parameters are dependent on material properties such as yield/UTS strength, work hardening effects, strain rate dependency, material elongations and material fracture strains. Appropriate representation of these material properties in CAE environment is very critical for reliable prediction of vehicle structural performance during development phase. Among all material properties, material fracture strain is the complex one and requires detailed material characterization approach for failure definitions. Conventional approach is based on failure strain obtained through uniaxial tensile test as per ASTM E8 standard. This approach however limits ability to predict failure under dynamic loading conditions wherein material experiences variable state of stress (non-proportional loading) like combination of tensile, shear and compressive loading in considerably shorter period of time. This limitation of conventional failure prediction approach is effectively addressed through GISSMO, which inherently accommodates effect of variable state of stress continuously during dynamic loading conditions; making it suitable for crash simulations much better than existing method. Presented work includes GISSMO material model development process; which involves coupon testing under different types of loading, corresponding CAE analysis, development of failure curve, element size & strain rate regularization and finally defining GISSMO card in LS-DYNA environment for steel material. This work is explained through example of dual phase steel DP590. Keywords: Material failure. GISSMO. Damage.

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