Effect of temperature on the fracture modes of BHW-35 steel under mode-II loading |
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Authors: | Fu Yongqing Gu Yanwei Jing Xiaotian and Margam Chandrasekaran |
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Institution: | (1) School of Mat. Sci. and Eng., Xi'an Jiao Tong Univ., 710048 Xi'an, China;(2) School of Mat. Sci. Eng., Xi'an Univ. of Technology, 710048 Xi'an, China;(3) Materials Lab., School of MPE, Nanyang Technological Univ., 639798, Singapore |
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Abstract: | Finite element method (FEM) has been used to analyze the stress and strain fields and the stress tri-axial levels around the tip of the crack under mode- II loading. The results show that: under mode- II loading, the direction of the maximum tensile stress and that of the maximum tri-axial levels (R
o
) exist at an angle of –75. 3° from the original crack plane; the maximum shear stress andR
o
= 0 exist along the original crack plane.Mode- II loading experiment using BHW-35 steel at different temperatures show that there are two kinds of fracture mode, opening mode (or tensile mode) and sliding mode (or shear mode). A decrease in temperature causes the fracture mode to change from shear mode to tensile mode. For BHW-35 steel, this critical temperature is about –90 C. Actually, under any kind of loading mode (mode I . mode II , mode III or mixed mode), there always exist several kinds of potenital fracture modes (for example, opening mode, sliding mode, tearing mode or mixed mode). The effect of temperature under mode- II loading is actually related to the change of the elastic-plastic properties of the material. |
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Keywords: | finite element method mode- II loading J integral |
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