Question

Define Threshold stress regarding stress-corrosion cracking.

(a) The maximum stress at which the specimen ruptures

(b) The maximum stress required to prevent cracking

(c) The minimum stress required to prevent cracking

(d) The minimum stress at which cracking starts

This question was addressed to me during an interview for a job.

The origin of the question is Eight Forms topic in chapter Eight Forms of Corrosion of Corrosion Engineering

Answer 1

Right choice is (c) The minimum stress required to prevent cracking

Explanation: Increasing stress decreases the time before cracking occurs. Threshold stress is the minimum stress required to prevent cracking. It depends on temperature, alloy composition, and environment composition.