Metallurgical Engineering
GATE MT concept:crack-growth PYQs
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How to practice concept:crack-growth
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–2 of 2. Imported answers require independent review unless marked reviewed.
Question 64
Open questionMTNAT2 marksNeeds review
A specimen containing maximum initial surface crack of size 1.5 mm is subjected to cyclic loading with
and
. Assuming specimen geometric factor of 1, and referring to the given figure, the crack growth rate in
m cycle
is __________ (round off to nearest integer).
Given: N = number of cycles
a = crack length
R = stress ratio
= stress intensity rangeLog in to check the answer
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Open questionMTNAT2 marksNeeds review
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, ΔK as
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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