PSI - Issue 60

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Vaibhav Gangwar et al. / Procedia Structural Integrity 60 (2024) 123–135 Vaibhav Gangwar / StructuralIntegrityProcedia00(2024)000 – 000

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High strain rate tensile tests are simulated in ABAQUS standard CAE software. Fig.(14) shows a typical quarter tensile sample with boundary conditions. The specimens are modeled with C3D8 elements with a total number of 360 elements and 666 nodes. The material model is implemented through a user-defined material code UMAT into ABAQUS software. For FE simulation two sets of material inputs for the MJC model aretaken from Table. 1 and Table. 2. FE simulated results from the first set are shown as MJC and the results from the second set are shown as MJC_NP. The results from both sets for different strain rates (velocities) are obtained and compared with experimental results as shown in Fig.15 (a-d). At all the given strain rates (velocities) the material parameters extracted by experimental data including INSTRON CEAST 9350 test system show better matching with experiments. It suggests that the inclusion of test data from drop-weight machine enhances the quality of material parameters. For further verification of the validity of test results Chapy impact test simulation has been performed by using the parameters extracted from both the experimental results and compared with experimental results.

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Fig. 15. Comparison of true stress vs. true plastic strain experimental data of servohyraulic with DIC and Impact testing machine with strain gauge with simulated results