United States Department of Transportation
i
Finite element analysis of unnotched charpy impact tests
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2008-10-01
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[PDF-282.67 KB]
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Abstract:This paper describes nonlinear finite element analysis (FEA) to examine the energy to
fracture unnotched Charpy specimens under pendulum impact loading. An oversized,
nonstandard pendulum impactor, called the Bulk Fracture Charpy Machine (BFCM), was
constructed to conduct studies to assess the fracture behavior of various tank car steels.
Comparisons between measured and calculated impact energies are presented. The effect of
various factors on impact energy is demonstrated through the test data and FEA results. These
factors include striker size and shape, specimen thickness, and specimen material. Moreover,
calculations of fracture energy are carried out using FEA in conjunction with different material
failure criteria. The FEA results using a failure initiation criterion based on the general state of
stress in terms of stress triaxiality and a failure progression model based on linear strain
softening are shown to provide excellent agreement with the experimental data.
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