A Review of Fatigue Crack Growth Characterisation by Linear Elastic Fracture Mechanics (Lefm). Part Ii—advisory Documents and Applications Within National Standards

Abstract

This paper presents a review of the application of LEFM to the characterisation of fatigue crack growth. This part covers national standards and other documents of comparable status that (a) offer explicit advice on the use of fatigue crack growth data, and (b) in which crack growth considerations are implicit. Documents falling into the first category were noted to have many features in common, differences occurring only in areas where the current understanding of the subject is far from complete (e.g. variable amplitude loading, long life, etc.). Documents implicitly addressing fatigue crack growth comprise three distinct groups: (i) those which aim to simplify fracture mechanics analyses for the user, (ii) those in which fracture mechanics has influenced design criteria, and (iii) those which aim to provide inspection and/or acceptance criteria. As with the "explicit documents", a degree of commonality was observed within each group of "implicit documents", the exception being the military aircraft specifications of the U.K. and the U.S.A.

Effects of CFRP bond locations on the Mode I stress intensity factor of centre‐cracked tensile steel plates

“…As mentioned earlier, several international standards have incorporated defect-tolerant design principles. [16][17][18][19][20] The SIF expressions are similar and all converge to Eq. (3) for through-thickness cracks.…”

“…through‐thickness crack, embedded elliptical crack, semi‐elliptical surface crack) 12,13 . Defect‐tolerant design principles and crack growth analyses (mostly based on the Paris Power law 14,15 ) have been incorporated in international standards 16–20 . However, few studies have attempted a simplified quantification of the CFRP strengthening effects on the SIFs of CCT steel plates.…”

“…12,13 Defecttolerant design principles and crack growth analyses (mostly based on the Paris Power law 14,15 ) have been incorporated in international standards. [16][17][18][19][20] However, few studies have attempted a simplified quantification of the CFRP strengthening effects on the SIFs of CCT steel plates. Shen and Hou 21 proposed a SIF formula for CCT aluminium plates strengthened with single-sided CFRP composite.…”

An Approximate Method for Fatigue‐life Prediction of Framed Structures

“…Indicative or conservative values of Kth and/or A&, and bounds relevant to these quantities, can be found in most national standards, see e.g. [7].…”

Fatigue crack growth of multiple interacting cracks: Analytical models and experimental validation

“…A simple and reliable tool that can be used for this kind of analysis is the Linear Elastic Fracture Mechanics . Many laws for fatigue crack propagation are available (e.g.…”