11hw6-25feb - It is reduced to a height of 100 mm. Assume...

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EML 4321 --- HW #6 --- Due start of class 25 February 1. A rectangular piece of metal has a 2” x 2” cross-section and is 8 feet long. It is made of a material which has a linear strain-hardening behavior where Y 0 = 20 ksi and K = 5 ksi. It is to be forged to a 1” x 4” cross-section. a. What are the peak pressure, average pressure, and forging force at the start of the forging process if i. the coefficient of friction is 0.1 ii. the coefficient of friction is 0.3 iii. there is sticking friction b. What are the peak pressure, average pressure, and forging force at the end of the forging process if i. the coefficient of friction is 0.1 ii. the coefficient of friction is 0.3 iii. there is sticking friction 2. Are the assumptions of no sticking valid for the Coulomb friction cases in the previous problem? 3. A cylinder has a diameter of 300 mm and a height of 200 mm.
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Unformatted text preview: It is reduced to a height of 100 mm. Assume the material has a linear strain-hardening behavior where Y = 160 MPa and K = 40 MPa. a. What are the peak pressure, average pressure, and forging force at the start of the forging process if i. the coefficient of friction is 0.1 ii. the coefficient of friction is 0.3 iii. there is sticking friction b. What are the peak pressure, average pressure, and forging force at the end of the forging process if i. the coefficient of friction is 0.1 ii. the coefficient of friction is 0.3 iii. there is sticking friction 4. Using my method (not Tlustys) calculate the force to simultaneously punch five rounded-rectangular holes 3 x 6 with 0.5 radii in 16 gage grade 30 US Steel 1008. (Hint: remember problem 1 of HW #3.)...
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