A strip yield model for two collinear cracks in plates of arbitrary thickness

Chang, D.; Kotousov, Andrei

doi:10.1007/s10704-012-9724-0

Cited by 22 publications

(14 citation statements)

References 18 publications

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“…The resulting governing equations were based on the 3D fundamental solution for an edge dislocation in a plate of finite thickness obtained in [16]. The governing equations were solved using the GaussChebyshev quadrature and the numerical solution procedure is described in a number of articles by the authors [17][18][19][20][21][22][23].…”

Section: Theoretical Approachmentioning

confidence: 99%

Experimental Study on Local Plastic Collapse in a Plate Weakened by Two Collinear Cracks

Mohabuth

Chang

Khanna

2015

MATEC Web of Conferences

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Abstract. Fracture and fatigue assessment of structures weakened by multiple site damage (MSD) currently represents a challenging problem. Here, we communicate the outcomes of an experimental study conducted on a plate weakened by two closely-spaced collinear cracks, which represents the simplest form of MSD. The experimental results are used to verify the predictions of a recently developed theoretical approach.

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Section: Theoretical Approachmentioning

confidence: 99%

Experimental Study on Local Plastic Collapse in a Plate Weakened by Two Collinear Cracks

Mohabuth

Chang

Khanna

2015

MATEC Web of Conferences

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“…The transient crack growth assessment procedure begins with the calculation of the nonlinear solution for the minimum applied stress of the n th cycle. The solution for the initial first cycle can be determined, for example, by utilising the results from an analysis of stationary cracks, which can be found in the work of Chang and Kotousov . The solution at

σ_{min}^{(italicn)}

is determined based on the crack opening displacement functions,

g {((), x)}_{max}^{((), italicn - 1)}

and

g {((), x)}_{min}^{((), italicn - 1)}

, known from the analysis of the previous load step.…”

Section: Crack Growth Modelmentioning

confidence: 99%

A fatigue crack growth model for interacting cracks in a plate of arbitrary thickness

Chang

Kotousov

2014

Fatigue Fract Eng Mat Struct

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Fatigue and fracture assessment of structures weakened by multiple site damage, such as two or more interacting cracks, represents a very challenging problem. A proper analysis of this problem often requires advanced modelling approaches. The objective of this paper is to develop a general theoretical approach and investigate the fatigue behaviour of two interacting cracks. The developed approach is based on the classical strip yield model and plasticity induced crack closure concept. It also utilises the 3D fundamental solution for an edge dislocation. The crack advance scheme adopts the cycle‐by‐cycle calculations of the effective stress intensity factors and crack increments. The modelling results were validated against experimental data available in the literature. Further, the nonlinear effects of the crack interaction and plate thickness on the crack opening stresses and crack growth rates were studied with the new approach for the problem geometry. It was demonstrated that the both effects could have a significant influence on fatigue life and cannot be disregarded in life and integrity assessments of structural components with multiple site damage.

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“…Numerous research efforts have been made to investigate the interaction effect of multiple cracks. [4][5][6][7][8][9][10][11][12] Using the Dugdale strip model and the distributed dislocation technique, [4][5][6][7] Chang and Kotousov 8-10 analytically studied two collinear cracks of equal and unequal lengths and discussed the relationship between the plastic zone size and crack tip opening displacement (CTOD) evolutions. Moreover, the fatigue growth of interacting surface cracks in a steel plate 11,12 was investigated experimentally and numerically, and the relative spacing of cracks and stress intensity factor were also discussed.…”

Section: Abstract Under Continuous Loading Conditions Small Cmentioning

confidence: 99%

Nonlinear elastic–plastic stress investigation for two interacting 3‐D cracks in offshore pipelines

Zhang

Ariffin

Xiao

et al. 2014

Fatigue Fract Eng Mat Struct

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Under continuous loading conditions, small closely distanced cracks can grow and coalesce into a large one that may subsequently pose a threat to the integrity and safety of structures. Although many research works were carried out for predicting fatigue growth of multiple cracks, few papers focusing on nonlinear elastic–plastic analysis of multiple cracks' fracture behaviours can be referred to. In this study, 3‐D elastic–plastic investigation has been performed on fracture behaviours of two collinear cracks located in offshore pipelines. The influences of the cracks configuration, the separation distance and internal pressure of the pipeline on the crack behaviours are investigated. On the basis of the numerical results, a new strain‐based crack tip opening displacement estimation method is proposed for assessing the fracture behaviour of flawed pipelines with two interacting collinear cracks.

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A strip yield model for two collinear cracks in plates of arbitrary thickness

Cited by 22 publications

References 18 publications

Experimental Study on Local Plastic Collapse in a Plate Weakened by Two Collinear Cracks

Experimental Study on Local Plastic Collapse in a Plate Weakened by Two Collinear Cracks

A fatigue crack growth model for interacting cracks in a plate of arbitrary thickness

Nonlinear elastic–plastic stress investigation for two interacting 3‐D cracks in offshore pipelines

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