Determination of crack initiation and propagation in two disc shaped specimens using the improved maximum tangential stress criterion

Eftekhari, M.; Baghbanan, Alireza; Mohtarami, Ehsan; Hashemolhosseini, Hamid

doi:10.15632/jtam-pl.55.2.469

Cited by 11 publications

(12 citation statements)

References 46 publications

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“…Conclusions are consistent with these described for classic stone materials MTS criterion overestimating fracture toughness (Aliha and Ayatollahi, 2011;Shetty et al, 1987). Recently new modification of criterion (improved MTS) was proposed (Eftekhari et al, 2017). Another possible modification is generalized MTS (Smith et al, 2001…”

Section: Fracture Initiation Anglessupporting

confidence: 85%

“…The adopted calculation method is contour integral using eXtended Finite Element Method. This approach is commonly used also in similar problems IJSI 12,1 (Eftekhari et al, 2017). The model consisted of four elements: a specimen, and three cylindrical surfaces imitating supports and the way in which the load was applied.…”

Section: Determination Of Sif Using the Finite Element Methodsmentioning

confidence: 99%

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Fracture behaviour of engineering stone material

Smolnicki

Cieciura

Lesiuk

et al. 2019

IJSI

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Purpose Engineered stone is a material which can be described as an artificial stone. The exemplary application area is sink production. There are very few research projects about this type of material. In fact, most of them are research conducted by the manufacturing company, which are limited to the basic properties of the material. However, knowledge about fracture mechanic of this material may be crucial in terms of usage. The paper aims to discuss this issue. Design/methodology/approach Analysis of the inside structure was made using an optical microscope as well as SEM. In the paper, methods which can be used to obtain data about fracture behaviour of material are presented. Using eXtended Finite Element Method and experimental data from three-point bending of notched specimens stress intensity factors (SIFs) for I and II load modes were obtained. Finally, a comparison between the fracture initiation angle in the function of the ration of SIFs for I/II load modes and maximum tangential stress hypothesis prediction was presented. Findings Analysis of the inside structure proves that this type of material has an uneven distribution of particle size. This can follow to void and micronotches formation and, later, to the failure of the material. A method of obtaining stress intensity factors for the discussed type of material and specimens can be successfully applied to other similar material, as proposed in this work. Standard crack angle propagation criteria are not sufficient for this type of material. Originality/value There are very few research papers about this type of material. The subject of fracture mechanic is not properly discovered, despite the fact that IT is important in terms of the application area of these materials.

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Section: Fracture Initiation Anglessupporting

confidence: 85%

Section: Determination Of Sif Using the Finite Element Methodsmentioning

confidence: 99%

Fracture behaviour of engineering stone material

Smolnicki

Cieciura

Lesiuk

et al. 2019

IJSI

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“…In this test, the initial crack angle (β) is defined as the angle between the crack direction and the direction of loading. Depending on the crack angle, the specimen can undergo pure mode I, pure mode II, or mixed mode I/II failure [21].…”

Section: Mixed-mode Fracture In Anisotropic Homogeneous Cbd Specimensmentioning

confidence: 99%

“…The effect of material anisotropy on the mode I stress intensity factors (SIFs) by a 3D Finite Element Method was also investigated and reported by Hirose et al [15]. Recently many attempts have been conducted to characterize the effects of geometric parameters (crack length, crack inclination angle, geometric shape of specimen) and mechanical properties (Poisson's ratio, degree of material anisotropy and anisotropic orientation) in homogeneous anisotropic materials [9,12,14,[16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Fracture mechanism simulation of inhomogeneous anisotropic rocks by extended finite element method

Mohtarami

Baghbanan

Hashemolhosseini

et al. 2019

Theoretical and Applied Fracture Mechanics

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The vast majority of rock masses is anisotropic due to factors such as layering, unequal in-situ stresses, joint sets, and discontinuities. Meanwhile, given the frequently asymmetric distribution of pores, grain sizes or different mineralogical compounds in different locations, they are often classified as inhomogeneous materials. In such materials, stress intensity factors (SIFs) at the crack tip, which control the initiation of failure, strongly depend on mechanical properties of the material near that area. On the other hand, crack propagation trajectories highly depend on the orthotropic properties of the rock mass. In this study, the SIFs are calculated by means of anisotropic crack tip enrichments and an interaction integral are developed for inhomogeneous materials with the help of the extended finite element method (XFEM). We also use the T-stress within the crack tip fields to develop a new criterion to estimate the crack initiation angles and propagation in rock masses. To verify and validate the proposed approach, the results are compared with experimental test results and those reported in the literature. It is found that the ratio of elastic moduli, shear stiffnesses, and material orientation angles have a significant impact on the SIFs. However, the rate of change in material properties is found to have a moderate effect on these factors and a more pronounced effect on the failure force. The results highlight the potential of the proposed formulation in the estimation of SIFs and crack propagation paths in inhomogeneous anisotropic materials.

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Reliability Assessment of Empirical Equations, ANN and MARS Models for Predicting the Mode I Fracture Toughness from Non-destructive Rock Properties

Lawal

Kwon

2023

Rock Mech Rock Eng

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Determination of crack initiation and propagation in two disc shaped specimens using the improved maximum tangential stress criterion

Cited by 11 publications

References 46 publications

Fracture behaviour of engineering stone material

Fracture behaviour of engineering stone material

Fracture mechanism simulation of inhomogeneous anisotropic rocks by extended finite element method

Reliability Assessment of Empirical Equations, ANN and MARS Models for Predicting the Mode I Fracture Toughness from Non-destructive Rock Properties

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