Experimental Characterization of the Elastic-Plastic Strain Fields at the Crack Tip Due to Cyclic Loading

Ranganathan, N.; Jendoubi, K.; Merah, Nesar

doi:10.1115/1.2904271

Cited by 10 publications

(2 citation statements)

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“…The crack will propagate forming wing cracks under compression [6]. As crack slip under shear stress and the slip itself cause wing cracks to grow at the crack tip, the study of mixed mode fracture initiation under compression is very important [7].…”

Section: Introductionmentioning

confidence: 99%

A Plasticity Criterion for Mixed Mode Fracture Initiation with Crack Surface Frictional Characteristics Under Compression

Zhou¹

2011

TOMECHJ

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A new plasticity criterion for mixed mode crack initiation angles under compression is presented, based on the characteristics of the plastic core region surrounding the crack tip with crack surface friction. The shape and size of the plastic core region were thoroughly analyzed under compression and the non-dimensional variable radius of the plastic core region for mixed mode compressive fracture was considered. Obviously, the mixed mode fracture initiation under compression is influenced by the frictional characteristics of the crack surface and the external compressive loading state. The loading ratio, Poisson's ratio and the influence of the friction coefficient on the crack tip plastic radius were analyzed. The proposed criterion shows that the crack extends in the direction of the global minimum of the plastic core region boundary. The presented criterion was simulated for various compressive loads and was compared, with other available criteria, against the laboratory experimental data. It can be seen that the presented criterion provides a better agreement with the experimental data.

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Section: Introductionmentioning

confidence: 99%

A Plasticity Criterion for Mixed Mode Fracture Initiation with Crack Surface Frictional Characteristics Under Compression

Zhou¹

2011

TOMECHJ

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“…Dugdale [2] proposed a D-M model to calculate the size of plastic zone. Jendoubi [3](1991) and Ranganathan [4] (1994) suggested that the shape and size of the plastic zone can be determined by Mises yield criterion. Zhao [5] proposed the effective stress expression and obtained the initial elastic-plastic boundary function around a crack tip.…”

Section: Introductionmentioning

confidence: 99%

On the Plastic Zone around a Crack Tip in a Rock Specimen

Ai¹,

Wu²,

Zhang³

et al. 2012

Proceedings of the 2nd International Conference on Electronic and Mechanical Engineering and Information Technology (2012)

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Abstract. The stress intensity factors (SIFs) for a infinite volume were corrected by two dimensionless quantities Y I and Y II which were obtained by employing the Boundary Collocation Method (BCM). The expression of the elastic-plastic boundary of a mixed crack for a cracked specimen was formulated based on the Mises yield criterion. Finally, the shape and scale of the plastic zone for tensile-shear cracks and compressive-shear cracks were analyzed and some meaningful conclusions were obtained. The results show that: the shape of a cracked specimen has an significant effect on the plastic zone; the scale of the plastic zone is much smaller than its real scale under the assumption of infinity volume; the orientation angle of a crack affects both the shape and scale of the crack tip plastic zone significantly under tension; the friction between the crack surfaces can reduce the scope of the crack tip plastic zone effectively under compression. IntroductionCurrently, more and more underground engineering projects have been implemented. The investigation on the failure mechanism of deep rock masses has become a hot issue. Under high temperature and pressure condition, the plastic deformation around a crack tip is significant, and this plastic deformation determines crack initiation, propagation and instability [1]. Thus, it is necessary to study the characteristics of the plastic zone under small scale yield condition. Dugdale [2] proposed a D-M model to calculate the size of plastic zone. Jendoubi [3](1991) and Ranganathan [4] (1994) suggested that the shape and size of the plastic zone can be determined by Mises yield criterion. Zhao[5] proposed the effective stress expression and obtained the initial elastic-plastic boundary function around a crack tip. Li [6] introduced the first and second estimations of plastic zone scale in detail. However, the rock specimen used in experimental study was finite, and it is unreasonable to analyze and evaluate the shape and scale of the plastic zone according to the fracture theory based on the assumption of an infinite volume.

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A new procedure for investigating three-dimensional stress fields in a thin plate with a through-the-thickness crack

Wang

2018

Sci. China Phys. Mech. Astron.

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Experimental Characterization of the Elastic-Plastic Strain Fields at the Crack Tip Due to Cyclic Loading

Cited by 10 publications

References 0 publications

A Plasticity Criterion for Mixed Mode Fracture Initiation with Crack Surface Frictional Characteristics Under Compression

A Plasticity Criterion for Mixed Mode Fracture Initiation with Crack Surface Frictional Characteristics Under Compression

On the Plastic Zone around a Crack Tip in a Rock Specimen

A new procedure for investigating three-dimensional stress fields in a thin plate with a through-the-thickness crack

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