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Study guide- Chapter 9

# Study guide- Chapter 9 - E MA 3010 Study guide Chapter 9...

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EMA 3010 Study guide Chapter 9 Know and understand the following things for Chapter 9: 1. The appearances, to the eye and microscopic, of ductile and brittle (both transgranular and intergranular) fracture. 2. Understand why stress concentration can cause failure at applied stresses lower than the expected failure stress, be able to compute stress concentration using eqn. 9.2. 3. Understand the concept of fracture toughness and the computations involving it. That is, be able to compute the crack size that will cause failure at a given applied stress for a material of a given fracture toughness, or the failure stress for a given crack size and toughness, or the fracture toughness needed to avoid failure at a given applied stress and crack size, etc…. all just different arrangements of the same equation (see eqns.9.4-9.7). 4. Know the definition of “a” for an external or internal crack.

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