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6. A very wide plate has a crack of 2mm. Aluminum 2024-T3 is subjected to 9MPa vm under zero-to-tension conditions under plane stress. (Part

6. A very wide plate has a crack of 2mm. Aluminum 2024-T3 is subjected to 9MPa vm under zero-to-tension conditions under plane stress. (Part A) Provide the crack growth history of the material through the end of its life. (Part B) At a crack length of 4mm, it is overloaded by 60% for one cycle, then returned to regular cycling. Provide the crack growth history of the material through the end of its life.

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