Fatigue Crack Closure and Delay Effects Under Mode I Spectrum Loading: An Efficient Elastic–plastic Analysis Procedure

Abstract

Abstract-Results of an elastic-plastic finite element analysis of crack closure effects under mode I Spectrum loading are presented. Various factors that cause crack growth acceleration or retardation under low-to-high, high-to-low, and single overload cyclic loadings are discussed.

Fatigue Damage, Crack Growth and Life Prediction

“…[127][128][129][130][131][132] and finite element models [133][134][135][136][137][138][139][140][141][142][143][144], among others. They can be grouped into two categories, namely analytical models, e.g.…”

“…[133][134][135][136][137][138][139][140][141][142][143][144]. [133][134][135][136][137][138][139][140][141][142][143][144].…”

Strip yield modelling of fatigue crack under variable amplitude loading

“…No special cracktip elements were employed, as the nature of the near-tip field singularity at the tip of a propagating fatigue crack with closure is not well understood [42,45,46]. While singular elements for ductile fracture problems are reported to predict stresses which are too large and strains which are too small [47], some researchers [48][49][50] have attempted to capture neartip field using special singular elements; however, this approach is inappropriate as the closure phenomenon itself changes the form of crack-tip field [51]. The requirement for crack propagation with retention of prior deformation further constrains the choice of crack tip elements in this work.…”

A short summary on finite element modelling of fatigue crack closure

“…[10] critical strain criterion, Ref. [13] critical crack opening stress, and the critical energy rate criterion of Ref. [71].…”