GATE MT 2020 Q46. Crack growth is being continuously measured in a test specimen subjected to constant amplitude cyclic stress with a mean stress of zero. The crack growth rate is related to the stress intensity range, delta(K) as, da/dN is proportional to (delta k)^3 where, a is the crack length and N is the number of cycles. When the crack length increases by a factor of two, the crack growth rate will increase by a factor of ________ (round off to one decimal place).

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Î”K = Kmax - Kmin But compressive stresses tend to close the crack so, here Kmin =0 because cyclic stress of constant amplitude are being applied. K = sigma *âˆš(Ï€*a) Where a is the crack length .

Î”K = Kmax – Kmin

But compressive stresses tend to close the crack so, here Kmin =0 because cyclic stress of constant amplitude are being applied.

K = sigma *âˆš(Ï€*a)

Where a is the crack length .

See lessCorrect answer is 2.8 @Digbijaya igit described it best. Thank you. Some peripheral lines related to this topic: delta(k)= sigma*square root(pie*a)

Correct answer is 2.8 digbijaya igit igit described it best. Thank you.

Some peripheral lines related to this topic:2.81

2.81

See less2.8284

2.8284

See less2.8

2.8

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