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| AN INVESTIGATION ON THE BRITTLE FRACTURE OF K_Ⅰ-K_Ⅱ COMPOSITE MODE CRACKS |
| Gao Hua;Wang Zhiqiang;Yang Chenshou;Zhou Aihua Institute of Mechanics; Academia Sinica |
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Cite this article:
Gao Hua;Wang Zhiqiang;Yang Chenshou;Zhou Aihua Institute of Mechanics; Academia Sinica. AN INVESTIGATION ON THE BRITTLE FRACTURE OF K_Ⅰ-K_Ⅱ COMPOSITE MODE CRACKS. Acta Metall Sin, 1979, 15(3): 380-391.
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Abstract The extention of the K_Ⅰ-K_Ⅱ composite mode (K_Ⅱ/K_Ⅰ=0-14) cracks has been inves-tigated by means of three-point and four-point bend specimens of high or mediumstrength steels as well as of nodular cast iron. All specimens were broken withbrittle fractures under linear elastic plane strain conditions, and the extending di-rection of the cracks appeared to agree well with the three existing theories, e.g.,the theory of maximum stress, the theory of strain energy and the theory of ener-gy releasing rate. The crack extension resistance, however, was found to increasewith the increase of K_Ⅱ-K_Ⅰ ratio, thus deviating obviously from the theoreticalprediction. This finding has been investigated with regard to the following aspects,e.g., the configuration and the size of the plastic zone, the state of stress at cracktips, etc. and in addition, the assumption that the crack extension resistance isindependent of the deformation characteristics was found to be untenable for speci-mens undergoing plastic deformation. Attempts have also been made to give a ten-tative discussion on a simple and reliable analytical method to deal with composi-te mode cracks for practical purpose.
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Received: 18 March 1979
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