Abstract
In this paper, the problem of a crack normal to an interface in two jointed orthotropic plates is studied as a plane problem. Body force method is used to investigate dependence of the stress intensity factor on the material elastic constants. A particular attention is paid to simplifying kernal function, which is used in the body force method, so that all the elastic constants involved can be represented by three new parameters : HI, H2I, H3 for the mode I deformation and HI, H2II, H3 for the mode II deformation. It is found that the effects of the material elastic constants on the stress intensity factors can be expressed by the three parameters, HI, H2I, H3 and HI, H2II, H3, respectively for KI and KII. Furthermore, it is also found that the dependence of KI on HI, H2I, H3 is exactly the same as the dependence of KII on HI, H2II, H3.
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