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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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16 Sep 1975
TL;DR: In this article, the authors investigated the cracks in a silica particle-filled epoxy resin composite system in air as a function of volume fraction of particles for volume fractions ranging from 0 to 0.52.
Abstract: The mechanical properties of a silica particle-filled epoxy resin composite system have been investigated in air as a function of volume fraction of particles for volume fractions ranging from 0 to 0.52. The Young's modulus and the compressive yield stress both increase as the volume fraction of silica particles is increased and various models of particle strengthening have been used to explain this behaviour. Slow crack growth in the various particulate composites has been studied using a fracture mechanics approach. The variation of crack velocity (V) with stress intensity factor (KI) has been measured for each of the compositions investigated. In each case, a unique relationship between V and KI has been found with KI increasing with volume fraction of particles at a given value of V. The failure mechanisms and the variation of other fracture mechanics parameters, for example, crack opening displacement and plastic zone size with increasing particle volume fraction have been discussed.

116 citations

Journal ArticleDOI
TL;DR: In this article, the authors used the optical method of reflected caustics combined with high speed photography to investigate the dynamic fracture initiation and propagation in 4340 steel. And they found that the crack tip velocity and stress intensity factor time records varied smoothly and repeatably allowing for a straightforward interpretation of the data.
Abstract: Dynamic fracture initiation and propagation in 4340 steel was investigated experimentally using the optical method of reflected caustics combined with high speed photography. A new crack propagation testing configuration consisting of a three point bend specimen loaded in a drop weight tower was used. It was found that prior to crack initiation the stress intensity factor time record calculated using the dynamic tup load and a static formula disagrees with the actual stress intensity factor measured by caustics. During crack propagation, the crack tip velocity and stress intensity factor time records varied smoothly and repeatably allowing for a straightforward interpretation of the data. The experiments show that for the particular heat treatment of 4340 steel used, the dynamic fracture propagation toughness depends on crack tip velocity through a relation that is a material property.

116 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of compositional and microstructural gradation on crack-tip stress fields, stress intensity factors and crack extension direction are summarised for cracks initially oriented both parallel and perpendicular to the gradient direction.

116 citations

Book
05 Oct 2012
TL;DR: In this article, the authors present a compendium of stress-intensity factors solutions for fatigue crack propagation and fracture mechanics approach to stress corrosion, and Linear Elastic Fracture Mechanics.
Abstract: Introduction.- Nature and phenomenology of fatigue.- Morphological aspects of fatigue crack formation and growth.- Factors that affect S-N fatigue curves.- Data scatter and statistical considerations.- Stress-based fatigue analysis. High cycle fatigue.- Strain-based fatigue analysis. Low cycle fatigue.- Notch effect.- Cumulative damage. Cycle counting and Life prediction. Fourier analysis. Impact fatigue. - Fracture Mechanics approach to fatigue crack propagation.- Crack tip plastic zone effect on fatigue crack propagation.- Fatigue in welded structures.- Corrosion.- Hydrogen embrittlement and sensitization cracking.- Fracture mechanics approach to stress corrosion.- Corrosion fatigue.- Linear Elastic Fracture Mechanics. Compendium of Stress Intensity Factors Solutions.

116 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined the fracture toughness and fracture growth rate of Boron-containing molybdenum intermetallics and found that they exhibited a relatively high intrinsic (crack-initiation) toughness at 800 up to 1200 � C( � 10 MPa p m), but only limited extrinsic R-curve toughness.

116 citations


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