Discussion
Assertion (A): A crack accelerates markedly as it approaches critical length.
Reason (R): Stress intensity grows with the square root of crack length.
Select the correct answer from the options below.
Answer: D
Both are true and the second explains the first. With the Paris exponent typically around three, a rising stress intensity feeds a rapidly rising growth rate, so most of the crack growth life is spent while the crack is still small.
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