Analysis of cracked and un-cracked semicircular rings under symmetric loading

Surendra, K. V. N.; Simha, K. R. Y.

doi:10.1016/j.engfracmech.2014.07.004

Cited by 10 publications

(3 citation statements)

References 34 publications

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“…In order to investigate the effects of the interface and sample size (ie, diameter of the bar in SHPB experiment), a half sine stress wave had been studied, and it can effectively reduce wave dispersion . At the same time, many specimens' types had been developed to research rock fracture . However, the experiments are still faced with many problems, such as the accuracy in measuring loads and the control of the boundaries .…”

Section: Introductionmentioning

confidence: 99%

“…5 At the same time, many specimens' types had been developed to research rock fracture. [7][8][9][10][11][12][13][14][15][16][17] However, the experiments are still faced with many problems, such as the accuracy in measuring loads and the control of the boundaries. 18 In fact, neither the amplitude of the stress wave nor the nature of the materials can be exclusively responsible for rock fracturing, 19 and it is combination of several factors that control the fracture propagation process.…”

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confidence: 99%

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Modelling of crack propagation in rocks under SHPB impacts using a damage method

Wang

Zhu

et al. 2019

Fatigue Fract Eng Mat Struct

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Rock dynamic fracture is a complex problem and has received considerable attention during the last few decades. In this paper, tensile crack softening failure criterion is used to study impact‐induced crack initiation and propagation in rocks. In order to examine applicability of the criterion, under realistic loading and boundary conditions, three boundary conditions were analyzed in details and an impacting experiment using single cleavage semicircle compression (SCSC) specimens had been successfully simulated. A good agreement was achieved between the simulation and experimental results. It was concluded that the boundary conditions play an important role in rock dynamic fracturing. When a stress wave propagates from a material with low wave impedance to a material of high wave impedance, the compression wave is partially reflected back and the process of fast cracking is suppressed. In addition, with the change of the tensile strength and the fracture energy, the crack initiation modes can be divided into four types.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Modelling of crack propagation in rocks under SHPB impacts using a damage method

Wang

Zhu

et al. 2019

Fatigue Fract Eng Mat Struct

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“…Dynamic fracture toughness usually is considered as a threshold value to predict the transient fractures of cracked structures under dynamic loads. Because such a threshold value has become so important in the usual designs of rock structures, a great deal of effort has been devoted to the study of the test techniques by using different configuration specimens, such as the specimens related to Brazilian disc, the radial cracked ring, the chevron bending, and the semicircular bend . Because of small dimensions, these specimens cannot be applied to the study of crack propagation behaviour for which the specimen dimension must be large enough so that the cracks have enough room to propagate.…”

Section: Introductionmentioning

confidence: 99%

Study of mode I crack dynamic propagation behaviour and rock dynamic fracture toughness by using SCT specimens

Dong

Zhu

Zhou

et al. 2018

Fatigue Fract Eng Mat Struct

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To study crack dynamic propagation behaviour and rock dynamic fracture toughness, a single cleavage triangle (SCT) specimen was proposed in this paper. By using these specimens and a drop‐weight test system, impact experiments were conducted, and the crack propagation velocity and the fracture time were measured by using crack propagation gauges. To examine the effectiveness of the SCT specimen and to predict the test results, finite difference numerical models were established by using AUTODYN code, and the simulation results showed that the crack propagation path agrees with the test results, and crack arrest phenomena could happen. Meanwhile, by using these numerical models, the crack dynamic propagation mechanism was investigated. Finite element code ABAQUS was applied in the calculation of crack dynamic stress intensity factors (SIFs) based on specimen dimension and the loading curves measured, and the curves of crack dynamic SIFs versus time were obtained. The fracture toughness (including initiation toughness and propagation toughness) was determined according to the fracture time and crack speeds measured by crack propagation gauges. The results show that the SCT specimen is applicable to the study of crack dynamic propagation behaviour and fracture toughness, and in the process of crack propagation, the propagation toughness decreases with crack propagation velocity, and the crack arrest phenomena could happen. The critical SIF of an arrest crack (or arrest toughness) was higher than the crack propagation toughness but was lower than the initiation toughness.

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Brittle Fracture Failure Analysis under Mixed-Mode Condition Using Asymmetric Edge Cracked Semicircular (AECS) Configuration

Shashidhara,

Umarfarooq,

Banapurmath

et al. 2023

Proceedings of the International Conference on Metallurgical Engineering and Centenary Celebration

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Analysis of cracked and un-cracked semicircular rings under symmetric loading

Cited by 10 publications

References 34 publications

Modelling of crack propagation in rocks under SHPB impacts using a damage method

Modelling of crack propagation in rocks under SHPB impacts using a damage method

Study of mode I crack dynamic propagation behaviour and rock dynamic fracture toughness by using SCT specimens

Brittle Fracture Failure Analysis under Mixed-Mode Condition Using Asymmetric Edge Cracked Semicircular (AECS) Configuration

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