Fracture and Fatigue Crack Growth Behavior of Surface Flaws and Flaws Originating at Fastener Holes. Volume 1. Results and Discussion

Hall, L. R.; Shah, R. C.; Engstrom, W. L.

doi:10.21236/ada001597

Cited by 21 publications

(9 citation statements)

References 16 publications

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“…Since aircraft structural fatigue includes both the initiation and the propagation of cracks, the influence of cold working on each of these phases has been studied experimentally. At about the same time that Phillips was optimizing the sleeve cold‐working process, Hall et al [16] were studying the behavior of fatigue cracks at fastener holes. Part of their study included fatigue crack growth at cold‐worked fastener holes in 9Ni–4Co–0.2C steel, 2219‐T851 aluminum and 6Al–4V high purity β‐annealed titanium.…”

Section: Introductionmentioning

confidence: 99%

“…Several years later, Hsu et al [17] conducted a very comprehensive study of flaw growth at fastener holes. The program was designed to complement the Hall et al study [16]; it addressed both fatigue and fatigue crack growth in two of the materials studied in the earlier program: 2219‐T851 aluminum and 6Al–4V high purity β‐annealed titanium. The experimental program included the growth of both part‐through and through thickness fatigue cracks from cold‐worked holes.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Effects of Cold Expansion of Fastener Holes

Ball

Lowry

1998

Fatigue Fract Eng Mat Struct

103

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A series of experimental investigations concerning the residual stress fields at cold‐expanded fastener holes and of the behavior of fatigue cracks at such holes has been conducted. These studies have included measurement of the initial, cold‐work‐induced residual stress fields at both uncracked and cracked holes and the performance of both constant amplitude and spectrum fatigue crack growth tests.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effects of Cold Expansion of Fastener Holes

Ball

Lowry

1998

Fatigue Fract Eng Mat Struct

103

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“…The crack growth during an overload cycle has been observed to be larger than one might expect from constant amplitude data [14]. This phenomenon is referred to as crack growth acceleration.…”

Section: Accelerationmentioning

confidence: 97%

“…Hillberry [i0-12] and others [13][14] The author has formulated an opinion from observed crack growth behavior, and from crack closure considerations of Newman [19], that the maximum effective stress ratio is a function of the constraint at the crack tip due to the different stress states, i.e., plane-stress or plane-strain or in between. Therefore a simple relationship has been used to determine the maximum allowable stress ratio used in equation ( …”

Section: List Of Symbolsmentioning

confidence: 99%

Multi-Parameter Yield Zone Model for Predicting Spectrum Crack Growth

Johnson

1981

Methods and Models for Predicting Fatigue Crack Growth Under Random Loading

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A systematic technique is presented for modeling crack growth load interaction effects due to spectrum loading.The Multi-Parameter Yield Zone (MPYZ) model accounts for crack growth retardation, acceleration, and underload effects.The load interactions are attributed to the residual stress intensity due to the plastic deformation at the crack tip. As part of an ASTM E24.06.01 round-robin effort, fatigue crack growth was predicted and compared with test data for a variety of spectrum loadings.

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“…where "" is an empirically determined material constant [45] and r is the notch root radius. In Glinka's approach the local strains and stresses should represent energy equivalence as compared the remote loading conditions, leading to the following equation: In this equation " K  " and " n " correspond to the material's cyclic hardening law.…”

Section: Influence Of Compressive Residual Stress On Fatigue Crack Inmentioning

confidence: 99%

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

Habiri

Benachour

2018

Frattura Ed Integrità Strutturale

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In this paper, numerical investigation was carried out to quantify the effect of the cold expansion on fatigue crack initiation in Aluminium alloy. The improvement in fatigue initiation life of specimen after the cold expansion process was investigated with the drilled hole of 2024 T351 Aluminium alloy plate. The applied degree of expansion (DCE%=100 (Dd)/d) is 4.6% where the effect of friction (µ=0.2) is considered. Residual stress field is determined using 3D Finite Element Analysis and shows the presence of compressive residual stress around the hole. The results showed a high compressive residual stress near the hole in exit face of the hole and at middle of the plate thickness around the hole. Local strain approach is applied in evaluation of fatigue initiation lives under Afgrow environment code. Fatigue initiation lives are improved by the presence of the compressive residual stresses comparatively to the drilled hole without of compressive residual stresses. Also, the fatigue initiation lives are increased with the increase in stress ratio for drilled hole and expanded hole Citation: El Habiri, Med., Benachour, M., Benachour, N., Effect of cold expansion on improving of fatigue initiation life of Aluminium alloy, Frattura ed Integrità Strutturale, 46 (2018) 34-44.

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Fracture and Fatigue Crack Growth Behavior of Surface Flaws and Flaws Originating at Fastener Holes. Volume 1. Results and Discussion

Cited by 21 publications

References 16 publications

Experimental Investigation on the Effects of Cold Expansion of Fastener Holes

Experimental Investigation on the Effects of Cold Expansion of Fastener Holes

Multi-Parameter Yield Zone Model for Predicting Spectrum Crack Growth

Effect of cold expansion on improving of fatigue initiation life in Aluminium alloy

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