熱残留応力を受けた二方向積層板のそり変形と界面応力

抄録

The required properties of fiber reinforced composites such as bi-directional laminates may be obtained by changing the ply angle of laminae. But these laminates have distinct interfaces and so their properties are affected by the state of these interface stresses. Therefore, in the design of bi-directional laminates, it is very important to grasp the situation of interface stress.
In this paper, the distortion behavior of bi-directional laminates under thermal residual stress, whose angle of principal axis in material properties was not 0°, was made clear by the experiments. In order to clarify the distribution of interface stresses, numerical analysis by finite element method (FEM) was carried out and the results were verified by the actual distortion behavior. A hybrid modeling with triangular shell and prismatic elements was used in the analysis. In the past, this modeling was found to be effective in the case of bi-directional laminates whose angle of principal axis in material properties was 0°.
The following conclusions are obtained.
(1) In the case that the angle of principal axis in material properties of laminates was not 0°, the experimental and numerical results showed quantitative accordance. So the hybrid modeling with triangular shell and prismatic elements was also effective in this case.
(2) By using this modeling, the distribution of interface stress and the distortion behavior can be guessed in bi-directional laminates whose angle of principal axis in the material properties was not 0°.