ABSTRACT

A three-dimensional (3D) finite element model is built to investigate the strain response of glass fibre reinforced epoxy matrix (GF/epoxy) cylindrical shells. Internal defects including delamination (IDD) and fracture defects (IFD) with different areas are considered. Progressive damage models are adopted to predict the circumferential strain (CS) and longitudinal strain (LS) and stress distribution. Results show that CS is the dominant strain when the GF/epoxy cylinders contain IDD, and the maximum LS and Mises stress position coincides with the loading position. The maximum Mises stress increases with the increasing of IDD area. However, when the cylinders contain IFD are subjected to internal pressure, the CS and LS are close. The maximum LS and Mises stress are located at the upper end of the cylinder and the defect position, respectively. The results will be useful for damage detection and health assessment of cylindrical shells containing internal defects.

摘要

建立三维 (3D) 有限元模型来研究玻璃纤维增​​强环氧树脂基体 (GF/环氧树脂) 圆柱壳的应变响应。考虑了不同区域的内部缺陷，包括分层（IDD）和断裂缺陷（IFD）。采用渐进式损伤模型来预测周向应变 (CS) 和纵向应变 (LS) 以及应力分布。结果表明，当 GF/环氧树脂圆柱体包含 IDD 时，CS 是主要应变，并且最大 LS 和 Mises 应力位置与加载位置重合。最大Mises应力随着IDD面积的增加而增加。但是，当装有 IFD 的气缸受到内部压力时，CS 和 LS 是关闭的。最大 LS 和 Mises 应力分别位于圆柱体上端和缺陷位置。