Residual strength analyses of stiffened and un-stiffened panels––Part I: laboratory specimens

Newman, James C.; Dawicke, D. S.; Seshadri, Banavara R.

doi:10.1016/s0013-7944(02)00133-9

Cited by 21 publications

(9 citation statements)

References 11 publications

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“…A, Measured and predicted crack extension in flat stiffened panel with a single lead crack . B, Measured and predicted crack extension in flat stiffened panel with a lead crack and MSD cracks…”

Section: Applicationsmentioning

confidence: 99%

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Characterization of stable ductile crack propagation by CTOA: Review of theory and applications

Tyson¹,

Newman

Xu³

2018

Fatigue Fract Eng Mat Struct

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Fracture toughness is a crucial material property in structural design with metallic materials. For resistance against crack initiation, the crack‐tip opening displacement (CTOD) (or, equivalently, the J integral) is well established. For resistance against crack extension, the “resistance curve” (J as a function of crack size) may be used for limited amounts of crack growth. However, for crack increments much larger than the material thickness, the most useful criterion for toughness characterization is the crack‐tip opening angle (CTOA). During the past three decades, standards have been introduced to enable reproducible measurement of CTOA. Simultaneously, improved computer‐aided photographic methods have been developed to measure surface CTOA during the fracture process, and analysis of the mechanics of bend specimens has enabled deduction of the CTOA from load and displacement. Elastic‐plastic finite‐element analyses using a constant‐CTOA fracture criterion have been used to simulate fracture of laboratory specimens and structural components and to transfer the properties measured from laboratory‐scale specimens to structural applications. This paper reviews the state of the art in measurement and application of CTOA.

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Section: Applicationsmentioning

confidence: 99%

“…Measured and calculated crack extension at surface and midplane in C(T) specimen 11,57 FIGURE 13 NASA/FAA wide stiffened panel crack configuration 12,58 and plane-strain core height (h c ) were determined from laboratory specimens restrained from buckling. 12 Again, these panels were allowed to buckle.…”

Section: Figure 12mentioning

confidence: 99%

Characterization of stable ductile crack propagation by CTOA: Review of theory and applications

Tyson¹,

Newman

Xu³

2018

Fatigue Fract Eng Mat Struct

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“…A detailed discussion of these is provided in [38] and shall not be repeated here. Note, however, that an important conclusion of various investigations is that the analysis should not be performed for plane stress or plane strain conditions (see Figure 10) but as three dimensional analyses [47][48][49] or as plane stress with plane strain core analyses [11,50].…”

Section: (C) Finite Element Fitting Of Experimental Load-displacementmentioning

confidence: 99%

Fracture and damage mechanics modelling of thin-walled structures – An overview

Zerbst¹,

Heinimann

Donne³

et al. 2009

Engineering Fracture Mechanics

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“…Considering the effect of crack‐front tunnelling, this difference between experimental and simulated crack extension is not unexpected, as the experimental measurements are taken on the surface of the specimen while the simulation (ZIP3D) is based on mid‐plane (centre node) behaviour. As shown in Figure 10A, the overprediction of the surface crack extension at the maximum load is slightly less than one specimen thickness (∼5.5 mm), which is slightly larger than the data presented by the other researchers [6, 22] for the 2024‐T351 aluminium alloy. This may be attributed to differences between tunnelling in flat fracture, which was observed in this study, and slant fracture.…”

Section: Computational Resultsmentioning

confidence: 58%

“…The crack tip opening angle parameter (CTOA) has been used successfully to characterise the material resistance to tearing and predict instability [1–11]. Dawicke et al.…”

Section: Introductionmentioning

confidence: 99%

Crack Tip Opening Angle Measurement Methods and Crack Tunnelling in 2024‐T351 Aluminium Alloy

Sakhalkar

Frink

Mahmoud

et al. 2011

Strain

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The crack tip opening angle (CTOA) fracture criterion is one of the most promising fracture criterion used to characterise the stable tearing process in metallic materials. Traditional methods used for the experimental characterisation of the CTOA involve accurate identification of the crack tip at each tearing event. Recently alternative methods have been proposed that reduce the necessity of accurately defining the current crack and rely more on the shape of the crack flanks to define the CTOA. In addition, these methods define an ‘apparent crack tip’, which may be different from the actual surface crack tip and may provide insight into the amount of crack‐front tunnelling that is occurring. In the current research, compact tension specimens fabricated from 6.35 mm thick 2024‐T351 aluminium alloy plate were evaluated to investigate different CTOA measurement methods and their potential for estimating crack‐front tunnelling. In addition to characterizing the CTOA, fatigue marker bands were employed to map the evolution of crack‐front tunnelling. The experimental critical CTOA values obtained from the alternative methods were noticeably lower than that obtained from the traditional approach and showed noticeably more scatter. When compared to the experimentally obtained marker bands, the alternative methods indicated limited potential for predicting crack‐front tunnelling.

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Residual strength analyses of stiffened and un-stiffened panels––Part I: laboratory specimens

Cited by 21 publications

References 11 publications

Characterization of stable ductile crack propagation by CTOA: Review of theory and applications

Characterization of stable ductile crack propagation by CTOA: Review of theory and applications

Fracture and damage mechanics modelling of thin-walled structures – An overview

Crack Tip Opening Angle Measurement Methods and Crack Tunnelling in 2024‐T351 Aluminium Alloy

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