Question

2. (1O pts) A flat bar of an annealed metal, whose strain-hardening behavior is expressed by σ 800 (10) es N m2, originally 25 mm in thickness. By a series of tw o consecutive reductions the initial thickness is reduced to 20 and 15 mm respectively under plane strain condition (the width of the bar , wis not changed). What is the new yield strength of the material? What is the temperature rise in this adiabatic deformation process? The pertinent data are: Density 7.87 (10)3 kg/m3, Mass heat capacity-0.46 (10)3 J/kg °C. Assum e that 95 % ofenergy is converted into heat. 25 20 15

Answer 1

Ghen deta cenus aen second Stkp3 Ism) 25 220 Calewati the strain 2

- 96 Calealea the totdl stoein SET= SEjf SE2 onegy Calculate the total hual pda Calculate the