等方性異材の解の利用による直交異方性異材の界面き裂の特異応力場の推定

抄録

For isotropic dissimilar materials, it is well known that the stress state can be expressed by two independent material composite parameters named Dundurs parameters α^iso, β^iso. Similar composite parameters were also derived for orthotropic dissimilar materials as α , β , Γ_A , Γ_B , ρ_A , ρ_B . Compared to two parameters in isotropic dissimilar materials, anisotropic dissimilar materials have such six independent material parameters, making it much more difficult to use previous analysis results and requiring the new analysis each time. In this study, first, the interface crack in orthotropic dissimilar materials is analyzed by applying the proportional method. Second, the singular stress field in orthotropic materials is compared with that in the isotropic dissimilar material under the condition α = α^iso，β = β^iso. The results show that the singular stress field in orthotropic dissimilar material can be evaluated within a few percent error in most cases from that in isotropic dissimilar material when α = α^iso，β = β^iso. In this isotropic replacement by applying α = α^iso，β = β^iso, the singular interface stress distributions in orthotropic dissimilar plates can be estimated within the 10% error even when the material anisotropy is widely changed.