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Question: please show full working for my understanding given answer is...

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Please show full working for my understanding.

Given answer is: 3.08

Use the fracture mechanics approach to calculate the safety factor against failure (crack growth) of a plate 500 mm wide, 1000 mm long and 20 mm thick subject to a tensile load of 360 kN along its length material is 4340 steel the crack is on the edge and penetrates in 150 mm(10)
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