Download PTU M.Tech. Civil Engg 2nd Semester 74302 INTRODUCTION TO THE THEORY OF PLASTICITY Question Paper

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M.Tech. Civil Engg (2016 Batch) EL-I (Sem.-2)

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INTRODUCTION TO THE THEORY OF PLASTICITY

Subject Code : MTEC-209 M.Code: 74302

Time : 3 Hrs. Max. Marks : 100

INSTRUCTIONS TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.

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2. Each question carries TWENTY marks.

1. 1. What is Bauschinger effect on steel? (8)
   2. Write in detail about 1D plasticity and viscoplasticity. (12)
2. Differentiate between Tresca and Von-Mises yield criteria. Explain in detail. (20)

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3. Derive the expression for tension of a circular bar in elastic-perfectly-plastic materials under incipient yielding, elastic-plastic and fully plastic cases. (20)
4. 1. Explain in detail true stress- strain diagram. (10)
   2. Write a short note on following : (10)
      1. Concept of plastic potential.
      2. State assumptions in yield criteria.

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5. A walled tube of mean radius 100mm and wall thickness 4mm is subjected to a torque of 10 N-m. If the yield strength of the tube materials is 120N/mm², determine the value of axial load applied to the tube so that the tube starts yielding according to Von-Mises criteria. (20)
6. Derive the associated flow rule and plastic dissipation for the Drucker-Prager yield criteria. (20)
7. Describe in detail the slip line field theory. Also write the assumptions in plasticity. (20)
8. Write short notes on following : (20)
   1. Shake down analysis

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   2. Drucker's Postulate
   3. Visco-plastic potentials

NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any page of Answer Sheet will lead to UMC against the Student.

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