PSI - Issue 28

B.W. Williams et al. / Procedia Structural Integrity 28 (2020) 1024–1038 Author name / Structural Integrity Procedia 00 (2019) 000–000

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simulations. Further testing would be needed to determine the exact Weibull modulus for TC128B. Representative distributions of the brittle fracture stress are also depicted in Figure 13. The effective strain to failure in the MMC damage model is a function of stress triaxiality, Lode angle, temperature, and strain-rate. The current work indicates that the brittle fracture stress is a function of temperature, as was also shown by Moattari et al. (2016). Dependency of the brittle fracture stress on strain-rate, stress triaxiality, and Lode angle was not considered.

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Figure 12: Predicted vs. measured dynamic Charpy responses of TC128B at various temperatures using coupled ductile-brittle fracture model