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Hello All, Greetings!! I am using mm, kg, ms units system in HyperCrash and using Mat Law 36 or PLAS_TAB for different parts. Therefore I have taken strain rate unit as 1/ms. But general standard unit for the strain rate is 1/sec. Therefore I ran simulation with units as 1/sec as well. Results: Simulation results of Strain rate with 1/sec units are closer to experimental results as compare to 1/ms simulation results. Above screen shot is from Radioss_10.0_Reference_Guide2. Please guide me what unit (1/sec or 1/ms) to use for accurate material modelling in Radioss. Thanks and Regards Nitin Jain