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Crack closure

About: Crack closure is a research topic. Over the lifetime, 28157 publications have been published within this topic receiving 588158 citations.


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Journal ArticleDOI
TL;DR: In this paper, the authors present a method of analyzing transverse crack initiation and multiplication in symmetric cross-ply laminates based on the concept of a through-the-thickness inherent flaw and the energy balance principle.

143 citations

Journal ArticleDOI
TL;DR: In this paper, two-dimensional, elastic-perfectly plastic finite element analyses of middle-crack tension (MT) and compact tension (CT) geometries were conducted to study fatigue crack closure and to calculate the crack-opening values under plane-strain and plane-stress conditions.

143 citations

Journal ArticleDOI
TL;DR: In this article, the influence of strain ratio and strain rate on cyclic deformation characteristics and fatigue life of an AZ31 extruded alloy was investigated. And the residual twins acting as barriers to dislocation slip and pile-up were considered to be the main cause for the occurrence of cyclic hardening.
Abstract: Magnesium alloys are increasingly used in automotive and aerospace industries for weight reduction and fuel economy improvement. Low cycle fatigue (LCF) behavior of these alloys is an important consideration for the structural applications. The objective of the present investigation was to identify influences of strain ratio and strain rate on cyclic deformation characteristics and fatigue life of an AZ31 extruded alloy. As the strain ratio decreased, stronger cyclic hardening rate, more asymmetric hysteresis loop, smaller stress amplitude, lower mean stress, and higher initial plastic strain amplitude were observed due to increasing compressive stresses. This was considered to be associated with the twinning during cyclic deformation in the compressive phase, and detwinning in the tensile phase. The residual twins acting as barriers to dislocation slip and pile-up were considered to be the main cause for the occurrence of cyclic hardening. Fatigue life increased with decreasing strain ratio and increasing strain rate. Fatigue crack initiation occurred at the specimen surface due to the presence of larger grains near the surface, and fatigue crack propagation was characterized by a mixture of striations and dimple-like ductile fracture features.

143 citations

Journal ArticleDOI
TL;DR: In this article, the effect of shot peening on the reverse bending fatigue behavior of Al-7075-T651 was investigated by means of X-ray diffraction (XRD) measurements.

143 citations

Journal ArticleDOI
TL;DR: In this article, the variations of the amplitude of the stress field, the triaxiality of stress and the crack tip opening displacement against the Triaxial stress constraint T = are analyzed in detail based on the work of Part I and Part II of this study.

142 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023219
2022536
2021143
2020154
2019172
2018244