Estimate the endurance strength for a 3in diameter rod of AI

Estimate the endurance strength for a 3-in diameter rod of AISI 1040 steel having a machined finish and heat-treated to a tensile strength of 120 kpsi, under axial loading.

Solution

Typically, Endurance strength is half of the Ultimate tensile strength (UTS) when the UTS is less than 200ksi

Ultimate tensile strength is the strength where material will fracture or breaks. It is nothing Tensile strength

Here for given material, Tensile strength is 120kpsi i.e., 120 ksi

So the Endurance strength = half of tensile strength i.e., 120/2 = 60ksi