Question

2. A ¼ in. diameter rod must be machined on a lathe to a smaller diameter for use as a specimen in a tension test. The rod material is expected to break at a normal stress of 63,750 psi. If the tensile testing machine can apply no more than 925 lb of force to the specimen, calculate the maximum rod diameter that should be used for the specimen. (precision of 0.000)\

Answer 1

Answer:

we use

$sigma=force /area\\A=\pi r^2\\D=2*r$