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| CRACK PROPAGATION UNDER TENSILE LOAD AND CALCULATION OF STRESS INTENSITY FACTOR |
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Received:October 28, 2005
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| DOI： |
| KeyWord:tensile load;crack propagation path; numerical manifold method;stress intensity factor |
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| 1.Qidong Limited Company of Industry Equipment Installation, Qidong 226200, Jiangsu, China ; 2. Personnel Division Henan Polytechnic University, Jiaozuo 454000, Henan, China 3. Key Laboratory of Engineering Geomeckanics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: |
| Tensile load is the main sort load leading to the matertal failure. To the material with a crack, the propagation path of the crack in the material under tensile load plays an important role in determining the failure forms. Fracture mechanics regards that the propagation paths of different cracks under the condition of the different extern load have much difference. According to the basic principle of the fracture mechanics, the propagation paths of the rectangle rock specimens with central and single side horizontal crack, central and single side inclined crack under tensile load are simulated in this paper by means of numerical manifold method. Meanwhile the stress intensity factor during the propagation is calculated, and the results show that the crack propagation is all non-steady propagation. In the end, the stress intensity factor in the crack tip of the four models is calculated, and the results show that the calculation error of the stress intensity factor is 6.8 % at the most, and that of the inclined crack is a little more than that of horizontal crack. |
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