Download JNTUA M.Tech 2nd Sem Supply 2018 Feb 9D15205 Theory of Plasticity Question Paper

Code: 9D15205

M.Tech II Semester Supplementary Examinations February 2018

THEORY OF PLASTICITY (Machine Design)

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(For students admitted in 2012, 2013, 2014, 2015 & 2016 only)

Time: 3 hours Max. Marks: 60

Answer any FIVE questions

All questions carry equal marks

1. Discuss about Mohr’s representation of stress in 2&3 dimensions.

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2. Explain about strain displacement relationships.
3. Explain about incremental stress strain relations.
4. A thick cylinder of internal radius 15 cm and external radius 25 cm is subjected to an internal pressure ‘p’ MPa. If the yield stress for the cylinder material is 220 N/mm², determine:
   1. The pressure at which the cylinder will start yielding just at the inner radius.
   2. The stresses in the cylinder when the cylinder has a plastic front radius of 20 cm.
   3. The stresses when the whole of the cylinder has yielded. Assume Von-Mises yield condition and a state of plane strain.

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5. Discuss about Drucker Prager material and general isotropic material.
6. Explain about deformation theory of plasticity.
7. Discuss about numerical algorithms for solving non linear equations.
8. Explain about upper and lower bound theorems.

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