Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones
The friction coefficient, tip curvature, and different-width crack state influence the stress intensity factor (SIF). The maximum circumferential tensile stress (MTS) and minimum strain energy density criterion (S) face challenges in explaining the mode-II fracture propagation of cracks. The maximum...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/9359410 |
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| author | R. Q. Huang L. Z. Wu B. Li |
| author_facet | R. Q. Huang L. Z. Wu B. Li |
| author_sort | R. Q. Huang |
| collection | DOAJ |
| description | The friction coefficient, tip curvature, and different-width crack state influence the stress intensity factor (SIF). The maximum circumferential tensile stress (MTS) and minimum strain energy density criterion (S) face challenges in explaining the mode-II fracture propagation of cracks. The maximum radial shear stress (MSS) and modified twin shear stress factor (ITS) criteria are proposed as the brittle mode-II fracture criteria. The experiments and numerical analysis are also performed. The results indicate that the fracture angles of the MSS and ITS were similar and different from the results of MTS and S. The equivalent stress intensity factors (ESIFs) from the mixed mode I-II are proposed to determine the fracture mode. There are different fracture models for different cracks under tensile and compressive stresses. The ratio of the tensile strength to uniaxial compressive strength influenced the fracture angle of ITS. The lateral pressure coefficient (k) had a significant effect on the mode-II fracture angle when the angle between the crack and the vertical direction is less than 40° and the lateral pressure coefficient is more than 0. Because the same fracture mode k (k > 0) can inhibit mode-I fracturing, conversely, it can also promote mode-I fracturing. Experimental results and numerical simulations of fracture propagation under uniaxial compression confirmed that the theoretical results were correct. |
| format | Article |
| id | doaj-art-1caaf3c8a8c44efb96d842e93abe9acc |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
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| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-1caaf3c8a8c44efb96d842e93abe9acc2025-08-20T03:54:37ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422019-01-01201910.1155/2019/93594109359410Crack Initiation Criteria and Fracture Simulation for Precracked SandstonesR. Q. Huang0L. Z. Wu1B. Li2State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaState Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaState Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, ChinaThe friction coefficient, tip curvature, and different-width crack state influence the stress intensity factor (SIF). The maximum circumferential tensile stress (MTS) and minimum strain energy density criterion (S) face challenges in explaining the mode-II fracture propagation of cracks. The maximum radial shear stress (MSS) and modified twin shear stress factor (ITS) criteria are proposed as the brittle mode-II fracture criteria. The experiments and numerical analysis are also performed. The results indicate that the fracture angles of the MSS and ITS were similar and different from the results of MTS and S. The equivalent stress intensity factors (ESIFs) from the mixed mode I-II are proposed to determine the fracture mode. There are different fracture models for different cracks under tensile and compressive stresses. The ratio of the tensile strength to uniaxial compressive strength influenced the fracture angle of ITS. The lateral pressure coefficient (k) had a significant effect on the mode-II fracture angle when the angle between the crack and the vertical direction is less than 40° and the lateral pressure coefficient is more than 0. Because the same fracture mode k (k > 0) can inhibit mode-I fracturing, conversely, it can also promote mode-I fracturing. Experimental results and numerical simulations of fracture propagation under uniaxial compression confirmed that the theoretical results were correct.http://dx.doi.org/10.1155/2019/9359410 |
| spellingShingle | R. Q. Huang L. Z. Wu B. Li Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones Advances in Materials Science and Engineering |
| title | Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones |
| title_full | Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones |
| title_fullStr | Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones |
| title_full_unstemmed | Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones |
| title_short | Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones |
| title_sort | crack initiation criteria and fracture simulation for precracked sandstones |
| url | http://dx.doi.org/10.1155/2019/9359410 |
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