T-strain effects in kinked interfacial fracture of bonded composites

Mirsayar, MirMilad

doi:10.1016/j.tafmec.2019.102381

Cited by 19 publications

(4 citation statements)

References 72 publications

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“…In quasibrittle materials such as rocks, the critical distance r c,V is large when compared to the specimen size and, therefore, on many occasions, classical fracture criteria like SV-MTS, which takes into account only the singular terms of stress field, cannot predict accurately the fracture load of rock notched samples. In such cases, it has been suggested in previous studies that higher order terms in the stress field could be taken into consideration [28][29][30][31][32][33][34] or, alternatively, the stress or strain components could be determined directly from FEM analyses. The MTS-FEM approach, utilized recently for predicting the fracture behavior of rock notched samples [22,[35][36][37], corresponds to the second approach.…”

Section: Analytical Approach: Mixed-mode Fracture Criterionmentioning

confidence: 99%

Mixed Mode Fracture Investigation of Rock Specimens Containing Sharp V-Notches

et al. 2022

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This work aims to assess both experimentally and analytically the fracture behavior of rock specimens containing sharp V-notches (SV-notches) subjected to mixed mode I/II loading. To this end, firstly, several mixed mode fracture tests were conducted on Brazilian disk specimens weakened by an SV-notch (SVNBD sample), performed in their corresponding center and with various notch opening angles. Secondly, the fracture resistance of the tested samples was predicted using a criterion named MTS-FEM. This approach is based on the maximum tangential stress (MTS) criterion, in which the tangential stress is determined from the finite element method (FEM). Additionally, in the present research, the required critical distance is calculated directly from finite element analyses performed on cracked samples. Comparing the experimental results and the analytical predictions, it is shown that the fracture curves obtained from the MTS-FEM criterion are in agreement with the experimental results. These results are achieved without the need for the calculation of stress series expansion coefficients, as an additional advantage of the proposed approach.

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Section: Analytical Approach: Mixed-mode Fracture Criterionmentioning

confidence: 99%

Mixed Mode Fracture Investigation of Rock Specimens Containing Sharp V-Notches

et al. 2022

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“…Then, given the boundary conditions and the calculated macroscopic stiffness tensor, the stress field coefficients K I , K II , and T are obtained numerically for the homogenized domain in every increment of the crack growth. In the current work, these coefficients are computed using the finite element overdeterministic (FEOD) approach which has been used widely in the past by Mirsayar and co-workers 44,57,[59][60][61][62][63][64] and other researcher [65][66][67] for various material systems, loading conditions, and specimen geometries. Finally, the crack propagation angle and onset of mixed-mode fracture can be predicted using the O-MPS criterion in every increment for any specimen geometry and loading conditions.…”

Section: Homogenized Orthotropic Fracture Criterionmentioning

confidence: 99%

On brittle fracture of two‐dimensional lattices with material anisotropies

Mirsayar

2022

Fatigue Fract Eng Mat Struct

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For the first time, this paper proposes a multiscale computational approach to investigate mixed‐mode I/II fracture in two‐dimensional lattices containing material anisotropies which find their applications in additive manufacturing of cellular structures. The layer‐by‐layer fabrication of lattices produced by the additive manufacturing techniques causes material anisotropies corresponding to the build orientation. Such material anisotropies, together with the cell topology, affect the fracture behavior of lattice components under various mechanical loading. The effective macroscopic elastic properties of periodic lattices obtained via numerical homogenization are fed into a continuum‐based fracture criterion to obtain crack path and onset of fracture under mixed‐mode I/II conditions. Different cell topologies are considered, and the predictions are compared with the results obtained directly by the finite element analysis. The results of this work can pave the way toward further understanding, and eventually, optimizing fracture toughness of additively manufactured lattices against various loading profiles.

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“…14 One of the approaches to improve the predictions of these classical criteria is use of higher order terms especially T-stress for characterizing the stress or strain component around the crack tip. [15][16][17][18][19][20][21][22] On the other hand, there are various test laboratory-size samples suggested in the literature for assessing the mixed mode fracture behavior of rocks. [23][24][25][26][27][28] The onset of fracture in the real rock structure which are often very large is predicted usually according to results obtained from these laboratory-size samples.…”

Section: Introductionmentioning

confidence: 99%

A stress-based approach for considering the size effect on the mixed mode fracture behavior of rock

Aslani

Akbardoost

Berto

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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It is aimed in this research that a new approach is represented for justifying the influence of specimen size on the mixed mode I/II fracture behavior of rock. The new approach, namely, the MTS-FEM criterion, is an extension of the maximum tangential stress (MTS) criterion in which the finite element method (FEM) is employed for characterizing the tangential stress at the critical distance. Also, two points exist in the MTS-FEM approach for the critical distance. First one is that the critical distance is obtained directly from finite element analysis corresponding to results of mode I fracture test. The second point is that the critical distance from the crack tip is considered as a function of specimen size. The experimental results carried out in the previous studies on cracked Brazilian disks (CBD) with four different radii and under mixed mode loading are utilized with the aim to evaluate the new size effect criterion. It is illustrated that the MTS-FEM criterion is able to predict the mixed mode fracture resistance of rock considering the size effect well without calculating any parameters related to the stress or strain series expansion.

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T-strain effects in kinked interfacial fracture of bonded composites

Cited by 19 publications

References 72 publications

Mixed Mode Fracture Investigation of Rock Specimens Containing Sharp V-Notches

Mixed Mode Fracture Investigation of Rock Specimens Containing Sharp V-Notches

On brittle fracture of two‐dimensional lattices with material anisotropies

A stress-based approach for considering the size effect on the mixed mode fracture behavior of rock

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