An engineer is to determine 1) the strain hardening exponent, 2) the strain hardening coefficient and 3) the ductility in %EL for a 0.505 inch diameter high strength 4140 steel alloy. During the tensile test, measurement were taken and at an ‘engineering’ load of 19,028 lb the steel alloy started to experience large number of dislocation motion resulting in a 0.004 strain on the steel bar. The peak ‘engineering’ load measured on the bar during the tensile test was recorded at 29,643 lb where the resulting strain was 0.0724, fracture occurred at a strain of .1770. Hint: to perform the strain hardening computations you need to compute true stress/true strain I

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