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HW_6_Solutions

# HW_6_Solutions - I E 215 HOMEWORK CHAPTER 18 18.1 The...

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IE 215 HOMEWORK CHAPTER 18 18.1. The strength coefficient = 550 MPa and strain-hardening exponent = 0.22 for a certain metal. During a forming operation, the final true strain that the metal experiences = 0.85. Determine the flow stress at this strain and the average flow stress that the metal experienced during the operation. Solution : Flow stress Y f = 550(0.85) 0.22 = 531 MPa. 6. For a certain metal, the strength coefficient = 700 MPa and strain- hardening exponent = 0.27. Determine the average flow stress that the metal experiences if it is subjected to a stress that is equal to its strength coefficient K . Solution : Y f = K = 700 = K ε n = 700 . 27 must be equal to 1.0. = 700(1.0) .27 /1.27 = 700/1.27 = 551.2 MPa 10. The following stress and strain values were measured in the plastic region during a tensile test carried out on a new experimental metal: (1) true stress = 43,608 lb/in 2 and true strain = 0.27 in/in, and (2) true stress = 52,048 lb/in 2 and true strain = 0.85 in/in. Based on these data points,

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HW_6_Solutions - I E 215 HOMEWORK CHAPTER 18 18.1 The...

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