JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III MECHANICAL WORKING OF METALS Previous Question Paper (February - 2022 - R18)
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Main
Draw the stress strain diagram for a ductile material and explain the following terminology.
Answer
The Proportional limit is the maximum stress up to which the stress is directly proportional to strain, following Hooke's Law. In the stress-strain diagram, this corresponds to the point where the curve remains a straight line starting from the origin.
Answer
The Elastic limit is the maximum stress that a material can withstand without undergoing permanent deformation. Once the stress exceeds this limit, the material will not return to its original shape upon unloading, resulting in permanent set.
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Explain the Mohr’s circle of stress in three dimensions.
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Explain Von-Mises distortion energy criterion.
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Explain octahedral shear stress and shear strain.
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Explain the closed-die forging process with the help of a neat sketch. Also mention its advantages and limitations.
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Explain the mechanics of metal working for slab method.
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Explain various defects in rolled products and their remedies.
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Explain the wire drawing and deep drawing operations with the help of neat sketches.
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