cracking caused by the combined actions of (i) mechanical stress and (ii) chemical agents or radiation or both.
Source:
PAC, 1996, 68, 2313. 'Definitions of terms relating to degradation, aging, and related chemical transformations of polymers (IUPAC Recommendations 1996)' on page 2318 (https://doi.org/10.1351/pac199668122313)