1. The problem statement, all variables and given/known data Given two wires of guage length 100mm and 200mm They are loaded to fracture in tension The 100mm sample extends by 15mm The 200mm sample extends by 25mm. I need to use this information to calculate the nominal strain at which necking commences in the wires 2. Relevant equations These are the relavent equations i can find in my notes relating to necking, stress/strain, true stress/strain we are also told, the true stress/strain curve generally represented by, where n is the work-hardening exponent "necking" in a sample started when the value of the true strain is equal to the work hardening exponent, i.e., 3. The attempt at a solution Im not so sure where to start with this as there are no forces given or areas. I assume we have to use the two sets of data to equated these terms and cancel them out.