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Concepts covered in this lecture : Empirical relations of Newman and Raju - continued, Triaxiality at the crack-tip - pictorial explanation, Selection of fracture toughness for various types of cracks, Insights of SIF for various cracks, Principal stresses at the crack-tip, Triaxiality - mathematical definition, Simplistic model to get plastic zone length and shape for Mode-I using Tresca and von Mises yield criteria.

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