Metallurgical Engineering
GATE MT concept:fracture-toughness PYQs
Build your understanding with focused practice from past exam papers.
How to practice concept:fracture-toughness
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 1–4 of 4. Imported answers require independent review unless marked reviewed.
Question 51
Open questionMTNAT2 marksNeeds review
For plane strain fracture toughness (K
) test of Maraging steel, the minimum thickness to achieve valid K
is (answer in integer) ____________ mm.
(Given: K
= 90 MPa√m and yield stress = 900 MPa)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 58
Open questionMTNAT2 marksNeeds review
For a component fabricated from an alloy A with plane strain fracture toughness,
MPa m
, fracture was observed to take place at a crack length of 0.4 mm at a tensile service stress of σ.If the same component is instead fabricated from alloy B with
MPa m
, the crack length at which a similar crack geometry will result in fracture (under identical tensile service stress of σ) is _____ mm (rounded off to one decimal place).Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 49
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An infinite metal plate has a central through-thickness crack of length
mm. The maximum applied stress (in MPa) that the plate can sustain in mode I is: __________ (round off to nearest integer).
Assume: Linear elastic fracture mechanics is valid
Given: Fracture toughness,
MPa m
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 22
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A component subjected to tensile stress in a mechanical device is monitored periodically for cracks by NDT. The NDT technique can only detect cracks (both surface and internal) which are larger than 1 mm. Keeping a 10% margin of safety, the maximum allowed tensile stress on the component will be _____ MPa (round off to the nearest integer).
Given, fracture toughness
and assume crack geometry factor of unity.Log in to check the answer
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