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Question: i need more understanding for these statements this is a...

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Explain the following statements: The ability of a material to resist crack growth depends on many factors: Larger flaws reduce permitted stress. Ductile materials have higher Kcfracture toughness Thicker samples have lower Kc fracture toughness Increasing temperature increases Kc fracture toughness Smaller grain sizes increase Kc fracture toughness

I need more understanding for these statements. This is a particular question inside my Materials Science and Engineering class. I could not find the appropriate subject to post the question. Please provide any help. Thank you!

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