15 A cylindrical workpiece is forged in an open die. The workpiece is 60 mm in diameter and 30 mmhigh. The height after forging is 15 mm. The coefficient of friction at the die-work interface is0.20. The flow curve equation for the workpiece is defined as,0 = 800 80.2where o is in MPa. The forging force (in MN) at the end of the stroke is closest to

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ndrical workpiece is forged in an open die. The workpiece The height after forging is 15 mm. The coefficient of frict The flow curve equation for the workpiece is defined as, 00 €0.2

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

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15 A cylindrical workpiece is forged in an open die. The workpiece is 60 mm in diameter and 30 mm
high. The height after forging is 15 mm. The coefficient of friction at the die-work interface is
0.20. The flow curve equation for the workpiece is defined as,
0 = 800 80.2
where o is in MPa. The forging force (in MN) at the end of the stroke is closest to

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A 250 mm diameter circle is etched on a 400 mm x 400 mm x 12 mm piece of sheet metal. The elastic modulus is 190 GPa and Poisson's ratio is 0.3 for the material If stresses of 40 MPa and 75 MPa are applied in the x and y directions respectively, calculate the following: a) Change in sheet thickness, i.e. find At. Hint engineering and true strain are equal in the elastic regime. b) Sketch the shape of the circle after deformation on the figure below c) What is the elastic strain energy in the thickness direction only?
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