This term is defined in ECSS-E-ST-32C Rev. 1 as
rupture, collapse, degradation, excessive wear or any other phenomenon resulting in an inability to sustain design limit loads, pressures (e.g. MDP) and environments

This term is defined in ECSS-Q-ST-70-45C as
condition generally caused by break or collapse so that a structural element can no longer fulfil its purpose

This term is defined in ECSS-S-ST-00-01C as
the event resulting in an item being no longer able to perform its required function