A Review of Crack Closure

Banerjee, Subhasis

doi:10.21236/ada142273

Cited by 25 publications

(10 citation statements)

References 47 publications

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“…If crack tip plasticity was the source of the observed closure, an increase in K cl would be expected with increasing K max as a result of the larger cyclic plastic wake behind the crack at the higher K max levels. [28,30,31] Second, the large effect of stress ratio on fatigue crack growth behavior is removed in both the duplex and lamellar microstructures when fatigue crack growth rate is plotted as a function of ⌬K eff (Figure 4). This is, again, consistent with roughness-induced closure mechanisms.…”

Section: Crack Closurementioning

confidence: 99%

Mechanisms of ambient temperature fatigue crack growth in Ti-46.5Al-3Nb-2Cr-0.2W

Worth

Larsen

Balsone

et al. 1997

Metall Mater Trans A

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Fatigue crack growth studies have been conducted on a two-phase alloy with a nominal composition of Ti-46.5Al-3Nb-2Cr-0.2W (at. pct), heat treated to produce duplex and lamellar microstructures. Fatigue crack growth tests were conducted at 23 ЊC using computer-controlled servohydraulic loading at a cyclic frequency of 20 Hz. Several test methods were used to obtain fatigue crack growth rate data, including decreasing-load-range-threshold, constant-load-range, and constant-K max increasingload-ratio crack growth control. The lamellar microstructure showed substantial improvement in crack growth resistance and an increase in the threshold stress intensity factor range, ⌬K th , when compared with the behavior of the duplex microstructure. The stress ratio had a significant influence on crack growth behavior in both microstructures, which appeared to be a result of roughness-induced crack closure mechanisms. Fractographic characterization of fatigue crack propagation modes indicated a highly tortuous crack path in the fully lamellar microstructure, compared to the duplex microstructure. In addition, limited shear ligament bridging and secondary cracking parallel to the lamellar interfaces were observed in the fully lamellar microstructure during fatigue crack propagation. These observations were incorporated into a model that analyzes the contribution of intrinsic vs extrinsic mechanisms, such as shear ligament bridging and roughness-induced crack closure, to the increased fatigue crack growth resistance observed for the fully lamellar microstructure.

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Section: Crack Closurementioning

confidence: 99%

Mechanisms of ambient temperature fatigue crack growth in Ti-46.5Al-3Nb-2Cr-0.2W

Worth

Larsen

Balsone

et al. 1997

Metall Mater Trans A

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“…These reviews discussed important and challenging issues associated with theoretical, numerical and experimental attempts aimed in determining crack closure/opening loads. The most extensive is the review by Banerjee, 2 which covers all methods for opening/closure load determination up to 1983. Later, Phillips 7,8 discussed the results of two ASTM round robins associated with experimental scatter of the most relevant (until 1993) methods.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The use of AE or PD methods involves different set of problems 2,3 . The reason for this is that the asperities may cause acoustical and/or electrical short circuits and both methods would register unrealistically high values of P op 2 , 100 . Thus, an acoustically or electrically closed/open crack is not equivalent to a mechanically closed/open crack, especially at the threshold region where the crack opening is relatively small.…”

Section: Introductionmentioning

confidence: 99%

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Methods for crack opening load and crack tip shielding determination: a review

and

Kujawski

2003

Fatigue Fract Eng Mat Struct

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In this paper a review of the literature on crack closure/opening load and crack tip shielding effects determination methods is presented. Commonly used ‘subjective’ (visual) and ‘non‐subjective’ approaches have been included. Procedures associated with the determination of an effective crack driving force for both Elber type and that of partial (or incremental) crack closure models have been covered. Comparison among different methods of analyses based on compliance and fatigue crack growth rate measurements is discussed together with their implications and difficulties in fatigue crack growth correlations.

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“…However, pronounced ambiguities exist concerning the interpretation of the nature and distribution of the residual stress patterns on the crack wake and behind the crack tip [4]. While a large number of techniques have been proposed for closure measurement [5], the reported results are not consistent and there is no standard technique which can be agreed upon.…”

mentioning

confidence: 99%