Validation of crack arrest technique by numerical modelling

Vulić, Naned; Jecić, Stjepan; Grubišić, Vatroslav

doi:10.1016/s0142-1123(97)00008-x

Cited by 21 publications

(5 citation statements)

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“…[27][28][29] Under continuous stress conditions (i.e., expansion of the active materials) the cracks propagate and grow. [30][31][32] Developing stress-relieving micronsized pores in the crack propagation paths in the polymer binder can afford the crack damping and stopping functions, leading to improved cycling performance.…”

Section: Introductionmentioning

confidence: 99%

Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries

et al. 2015

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ARTICLE This journal isThe high capacity Si (4200 mAh/g, Li 4.4 Si) commonly undergoes cracking and delamination due to drastic volume change (~300%) during lithiation/delithiation processes in lithium ion batteries (LIBs). In this work, abundant and sustainable natural polymer gum arabic (GA) and low cost polyacrylic acid (PAA) are used to fabricate Si anode with resilient, crack-blocking property. Esterification reaction between GA and PAA establishes a flexible network resulting in reinforced mechanical strength and enhanced coherent strength. Meanwhile, the water vapour resulted from the esterification reaction generates micron-sized pores which relieves the stress and blocks the formation and propagation of cracks. As a result of the crack-blocking effect, the resultant Si anodes present a superior volumetric capacity of 2890 Ah/L. In addition, charge-discharge cycling for more than 1000 cycles is achieved with Li insertion capacity limited to 1000 mAh/g at 1 C rate.

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Section: Introductionmentioning

confidence: 99%

Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries

et al. 2015

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“…McNeil and Heston reported that depending upon the fatigue stress level; the process can result in an improvement in fatigue life by a factor of 3 to 10 [8][9][10] . In [11][12][13][14] , the authors show the sensitivity of the degree of expansion. In a first phase the residual life increases but beyond a critical value of remaining life decreases sharply and growth is extremely detrimental.…”

Section: Introductionmentioning

confidence: 99%

Effect of hardening induced by cold expansion on damage fatigue accumulation and life assessment of Aluminum alloy 6082 T6

et al. 2012

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Hole cold expansion (HCE) is an effective method to extend the fatigue life of mechanical structures. During cold expansion process compressive residual stresses around the expanded hole are generated. The enhancement of fatigue life and the crack initiation and growth behavior of a holed specimen were investigated by using the 6082 Aluminum alloy. The present study suggests a simple technical method for enhancement of fatigue life by a cold expansion hole of pre-cracked specimen. Fatigue damage accumulation of cold expanded hole in aluminum alloy which is widely used in transportation and in aeronautics was analyzed. Experimental tests were carried out using pre-cracked SENT specimens. Tests were performed in two and four block loading under constant amplitude. These tests were performed by using two and four blocks under uniaxial constant amplitude loading. The increasing and decreasing loading were carried. The experimental results were compared to the damage calculated by the Miner's rule and a new simple fatigue damage indicator. This comparison shows that the 'damaged stress model', which takes into account the loading history, yields a good estimation according to the experimental results. Moreover, the error is minimized in comparison to the Miner's model.

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“…Hao Wu et al [2] and Song et al [1] have done experimental tests and computer simulations in order to study SD diameter influence. Some crack repair methods have been studied by Domazet [3] and Vulic et al [4]. More recently, a great deal of research has been undertaken on increasing SD fatigue life by drilling adjacent holes near the crack tip SD by Murdani et al [5] [6] and also experimental tests and computer simulations of the application of compressive stresses on SD vicinity by Amrouche et al [7], Zhang et al [8] and Nigrelli et al [9].…”

Section: Introduction Objectivementioning

confidence: 99%

A Fatigue Study of C-130 Aircraft Skin Using the Stop Drill Technique

Cardoso

Infante²,

Serrano

2012

MSF

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The stop-drilling technique is a simple and economic way to delay crack propagationby drilling a hole on the crack tip and reducing stress concentration. This paper presents thepropagation of cracks and investigates how the increasing of the stop-drill diameter improvescrack initiation life in specimens of 2024-T3 aluminium alloy of C-130 aircraft skin. A numericalmethod was applied to simulate an automatic crack propagation by interacting ANSYSr andMATLABr, and several experimental fatigue tests were done to support the computationalresults. A Morrow equation was used to predict the fatigue life of the stop-drill. Good agreementof stress intensity factor along crack length was obtained between numerical and experimentalresults. All results show that fatigue life increases when the stop-drill diameter is larger. Whencompared to the 2mm diameter stop-drill, the experimental results show an improvement of189% and 464% to 4mm and 6mm diameter stop-drill fatigue life, and the numerical results of333% and 952%, respectively.

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Validation of crack arrest technique by numerical modelling

Cited by 21 publications

References 1 publication

Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries

Low cost and environmentally benign crack-blocking structures for long life and high power Si electrodes in lithium ion batteries

Effect of hardening induced by cold expansion on damage fatigue accumulation and life assessment of Aluminum alloy 6082 T6

A Fatigue Study of C-130 Aircraft Skin Using the Stop Drill Technique

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