GATE PI concept:flow-stress PYQs & Answers

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 1–3 of 3. Imported answers require independent review unless marked reviewed.

Topic practice 3 questionsPage 1 of 1

In a wire drawing of a perfectly-plastic material with flow stress of 300 MPa, the back tension is zero and front tension is 200 MPa. Assuming ideal deformation with zero friction, the percentage reduction of the cross-sectional area of the wire is________. (Rounded off to one decimal place)

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A workpiece of 30 mm diameter and 40 mm height is compressed between two plates in an open die forging process. Assume a perfectly plastic material with a flow stress of 300 MPa. The ideal forging load (in kN) at 30% reduction (in height) is____________. [round off to nearest integer]

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A cylindrical billet of 90 mm diameter is extruded to produce an I-section as shown in the figure (all dimensions in mm).

Diagram for Production and Industrial Engineering question 44

The total extrusion pressure (

) in MPa required for the above process is given by

where,

is the mean flow stress of the material, and

and

are the initial and the final cross-sectional areas, respectively. If the mean flow stress of the extruded material is 80 MPa, the force required for the above extrusion (rounded off to one decimal place) in kN is __________.

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GATE PI concept:flow-stress PYQs

How to practice concept:flow-stress

Question 45

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Question 44