Question

A materials proof stress is the highest stress possible for it to tolerate without causing a permanent set of more than ___________ inch per inch the length of gage, after the total release of stress.

(a) 5.1

(b) 0.002

(c) 0.0001

(d) 0.1

I got this question during an online interview.

Query is from Aircraft Materials topic in division Testing Aircraft Materials of Aerospace Materials & Processes

Answer 1

The correct choice is (c) 0.0001

For explanation: The highest possible stress a material can, without causing a permanent set of more than 0.00001 inch per inch of the gage length is called proof stress. This is after the total release of the stress.