End of Life Limiting Defect Size 

ELLDSEnd of Life Limiting Defect Size is the calculated maximum defect size that a component can tolerate before failing. The ELLDS is calculated to give a fracture driving force equal to an end-of-life fracture toughness criterion. This fracture toughness criterion is a lower bound to the true fracture toughness of the component and, hence, has an in-built safety margin. ‘Limiting defect size’ is used in preference to the term ‘critical defect size’, as ‘critical’ implies the size at which the component will actually fail. However, the two terms are often used interchangeably.

For more information on fracture mechanics assessment see: http://s538600174.onlinehome.fr/nugenia/wp-content/uploads/2014/07/FM-Position-Paper_Draft4_10Junel15.pdf

What the hec?! articles are not intended to be the definitive account on the topic or acronym in question. Readers’ comments and contributions are welcomed. Email: ndtnews@bindt.org