Growth of cracks under far-field cyclic compressive loads: Numerical and experimental results

Holm, D.; Blom, A.F.; Suresh, S.

doi:10.1016/0013-7944(86)90150-5

Cited by 55 publications

(21 citation statements)

References 7 publications

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“…K max 6 0 , fatigue crack growth has been observed and this has been explained in terms of a zone of residual tensile stresses that develop at the crack-tip (Holm et al, 1986;Suresh, 1991). As the length of the fatigue crack increases in such conditions, the fraction of the loading cycle during which the crack remains open progressively diminishes, and this causes the crack to arrest completely after growth over a certain distance.…”

Section: Discussionmentioning

confidence: 95%

On fatigue crack growth in ductile materials by crack–tip blunting

Tvergaard

2004

Journal of the Mechanics and Physics of Solids

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Section: Discussionmentioning

confidence: 95%

On fatigue crack growth in ductile materials by crack–tip blunting

Tvergaard

2004

Journal of the Mechanics and Physics of Solids

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“…Even, micro-plasticity seems to have an effect on the variation of residual stress distribution along the bore, the onset of stress decay coincides after some numbers fatigue cycles when it causes a detectable short crack initiation. Thus, a substantially faster crack initiation rate and later a greater crack growth distance are promoted in plane-stress than in plane-strain [78]. The plane-strain condition causes a large crack closure load than plane-stress.…”

Section: Redistribution Of Residual Stress Fields During Fatiguementioning

confidence: 99%

Experimental assessment of the redistribution of 3-D residual stresses during early fatigue at split-sleeve cold expanded reamed A/C fastener holes

Özdemir

2017

Scientia Iranica

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Abstract.Cold expansion is an effective technique of inducing favorable compressive residual stresses around fastener holes essentially vital for improving fatigue performances of aircrafts. The benefit is caused by the magnitude and distribution of the compressive stress field. Stress gradients are entirely contingent on type of the cold expansion, local geometry of the hole and characteristics of the metallic structure. During cyclic loading however, initial residual stresses do not remain stable. In the present work, specimens with 4% split-sleeve cold expanded and reamed holes were cycled at the fatigue limit for short periods. Recent method of Combined Step Drilling-Fourier Series Solution 'ATÖzdemir Method' was employed to appraise the continual redistributions of residual hoop stresses at the side of the hole subjected to cyclic load. Some results were compared with that of diffraction methods and Artificial Neural Network (ANN) modeling where, close similarities in stress distributions were confirmed. It is clear that during early fatigue, material nearby the hole is dynamically hardening; in response compressive residual stresses along the bore are gradually increasing till the onset of cracking. Short fatigue cracks mostly initiate from the mandrel entrance side, where subsequently residual hoop stresses begin to relax considerably.

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“…[16] calculated numerically the length of the arrested cracks, with the condition that the maximum value of the cyclic load is equal to the closure load. The measured and the calculated fwere in good agreement [16].…”

Section: The Length Of the Arrested Cracksmentioning

confidence: 99%

“…Suresh [6] investigated also the length of arrested cracks on notched specimens (notch angle 60") in cyclic compression (R = lo), and Holm el al. [16] calculated numerically the length of the arrested cracks, with the condition that the maximum value of the cyclic load is equal to the closure load. The measured and the calculated fwere in good agreement [16].…”

Section: The Length Of the Arrested Cracksmentioning

confidence: 99%

The Growth of Short Cracks Under Cyclic Compression

Pippan

1987

Fatigue Fract Eng Mat Struct

107

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The fatigue crack growth behaviour, the length of the arrested cracks and the shape of the crack front were investigated for cyclic compression. Specimens with deep sharp notches were used. The experiments were performed for different load amplitudes and load ratios under conditions of small scale yielding. The material used was ARMCO-iron. The growth rate and length of the arrested cracks were estimated and compared with the experimental results. The crack growth rate of very short cracks is determined by the stress intensity and is independent of the stress ratio. The length of the arrested cracks depends on the stress ratio and is bounded by the size of the cyclic and the monotonic plastic zones. NOMENCLATURE a = crack length ( = uo + I ) a, = notch depth K = stress intensity factor AK = stress intensity factor range K,,, = maximum stress intensity factor K,,, = minimum stress intensity factor K,, = closure stress intensity factor AK,,,, = effective threshold stress intensity factor range I =crack length measured from the notch root r= length of the arrested crack measured from the notch root dljdN = crack growth rate ( = dajdN) N = number of cycles R = ratio = Km,,/Km,, p = radius of the notch root ay = yield stress w = size of the monotonic plastic zone w, = size of the monotonic plastic zone after the first cycle. Aw = size of the cyclic piastic zone Atu, = size of the cyclic plastic zone after the first cycle

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Growth of cracks under far-field cyclic compressive loads: Numerical and experimental results

Cited by 55 publications

References 7 publications

On fatigue crack growth in ductile materials by crack–tip blunting

On fatigue crack growth in ductile materials by crack–tip blunting

Experimental assessment of the redistribution of 3-D residual stresses during early fatigue at split-sleeve cold expanded reamed A/C fastener holes

The Growth of Short Cracks Under Cyclic Compression

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