Stress Corrosion Crack Coalescence

Parkins, R. N.; Singh, Preet M.

doi:10.5006/1.3585136

Cited by 86 publications

(53 citation statements)

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“…This approach found application in the investigations of multiple surface cracking of materials [5,7,8] and each model is based on individual initial prerequisites depending on the problem to be solved.…”

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confidence: 99%

“…8. In coalescence, quasi-collinear cracks in close proximity interact through the influence zones at their tips that shows in the changes in their propagation paths when their tips approach one another [4,6,7,9,11]. The influence zones are assumed to have the shape of a circle of diameter s (Fig.…”

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confidence: 99%

“…The presence of a large number of short cracks scattered over a limited surface area is one of the manifestations of damages in machine parts under cyclic loading. Fracture of materials induced by the processes of initiation, growth, and coalescence of cracks, which are continuous in time, is universal [1], it is called multiple (dispersed or multisite) and is characteristic of many damaging factors, e.g., isothermal and nonisothermal fatigue [2][3][4][5], cyclic creep [6], and corrosion [7].Multiple fracture (MF) is of stochastic nature due to a random process of crack initiation in time, as well as random character of their dispersion on the surface, the rate of their growth and coalescence. During the coalescence of dispersed short cracks, their dimensions increase in a jump-like manner.…”

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confidence: 99%

“…In simulation, a constant value of the crack quantity increment within a given number of iterations is assigned. This defines a linear time dependence of the amount of accumulated cracks [2,3,7,11]. 5.…”

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confidence: 99%

“…The length distribution for such a crack is described by an exponential law. 7. The mean value of the length increment for any crack within a given number of iterations is prescribed.…”

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Modeling of coalescence of dispersed surface cracks. Part 2. Simulation model for multiple fracture

et al. 2005

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620.191.001.57(045) and A. V. Bashta A simulation model for multiple fracture has been developed that reproduces random processes of initiation, growth, and coalescence of dispersed surface cracks. The model is based on the method of statistical simulation (Monte Carlo method) and on the fracture regularities determined experimentally. The main factor responsible for fracture is found to be the coalescence of dispersed cracks, especially at the final stage, which accounts for about 30% of the total life. The ultimate state of a structure is defined by the condition according to which the length of the largest of the available damages is bigger than the calculated value of the maximum crack length.Introduction. The presence of a large number of short cracks scattered over a limited surface area is one of the manifestations of damages in machine parts under cyclic loading. Fracture of materials induced by the processes of initiation, growth, and coalescence of cracks, which are continuous in time, is universal [1], it is called multiple (dispersed or multisite) and is characteristic of many damaging factors, e.g., isothermal and nonisothermal fatigue [2][3][4][5], cyclic creep [6], and corrosion [7].Multiple fracture (MF) is of stochastic nature due to a random process of crack initiation in time, as well as random character of their dispersion on the surface, the rate of their growth and coalescence. During the coalescence of dispersed short cracks, their dimensions increase in a jump-like manner. Under condition of high concentration of defects, this may lead to an unexpected initiation of a critical (inadmissible in size) crack.The amount of experimental data on multiple fracture is rather limited. This is explained by the laboriousness of identification and complexity of monitoring the behavior of a large number of small-size defects on the specimen surface. Yet, the available experimental data make it possible to reveal general manifestation of the multiple fracture and, on this basis, to construct a mathematical model for the process and obtain the required results by means of a numerical experiment. The objective of this work was to develop a simulation model for multiple fracture.The model presented here simulates the processes of random initiation, propagation, and coalescence of surface microcracks occurring simultaneously. The damage evolution is described with allowance for the force interaction of the cracks in close proximity during their coalescence.The ultimate state is characterized by the appearance of a crack of a given critical size or by the formation of a cluster, which penetrates the damaged surface, due to large-scale coalescence of cracks of high concentration.The model is based on the method of statistical simulation (Monte Carlo method). This approach found application in the investigations of multiple surface cracking of materials [5,7,8] and each model is based on individual initial prerequisites depending on the problem to be solved.Initial Prerequisites of the Model. The initial p...

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“…The length distribution for such a crack is described by an exponential law. 7. The mean value of the length increment for any crack within a given number of iterations is prescribed.…”

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Modeling of coalescence of dispersed surface cracks. Part 2. Simulation model for multiple fracture

et al. 2005

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Experimental Study of Short Crack Coalescence in Nickel‐Base Alloys in PWR Primary Water

Calonne¹,

Fournier

Combrade³

et al. 2012

15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems‐Water Reactors

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Failure mechanisms in CoCrMo modular femoral stems for revision total hip arthroplasty

et al. 2016

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In this retrieval study, we reported the failure mechanisms of the CoCrMo-based hip implants. Systematic analyses on the clinically failed modular femoral stems from Revitan™ revision prostheses revealed a multistep fracture process. Multiple microcracks were first developed under the combined action of pitting corrosion and dynamic tensile stress on the lateral side of the CoCrMo connection taper. These microcracks then served as the initiation sites of further corrosion fatigue cracking leading to the final catastrophic failure. This crack initiation process has not been previously reported on retrieved CoCrMo components and our findings provide valuable information on the clinical performance of such implants, as well as the material selection and structural designs of future modular stems. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1525-1535, 2017.

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Stress Corrosion Crack Coalescence

Cited by 86 publications

References 0 publications

Modeling of coalescence of dispersed surface cracks. Part 2. Simulation model for multiple fracture

Modeling of coalescence of dispersed surface cracks. Part 2. Simulation model for multiple fracture

Experimental Study of Short Crack Coalescence in Nickel‐Base Alloys in PWR Primary Water

Failure mechanisms in CoCrMo modular femoral stems for revision total hip arthroplasty

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