Elastic Plastic Fracture Mechanics: J-Integral Theory

In this video I will drive the J-integral equation from scratch. I will then present 2 alternative ways to write the J-integral. Finally, I will present the stress field around a crack according to the HRR fields solution.
0:00 Introduction
1:20 J-Integral
8:21 Stress Field
10:25 Summary

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I understand nothing