The initial geometric imperfection is one of the primary factors affecting the buckling behaviors of composite cylindrical shells under hydrostatic pressure. In this study, ovality and thickness variations as two representative types of the geometric imperfections are considered. After measuring the geometric imperfections, a typical carbon fiber reinforced polymers (CFRP) cylindrical shell is tested to obtain the buckling pressure. The buckling behaviors of the shell sample are analyzed in combination with the strain responses. By using the nonlinear numerical analysis, the buckling shapes of the CFRP cylinder shells with different combinations of ovality and thickness variation are firstly discussed. The rules of influence of such imperfections on the buckling pressure are then obtained by nonlinear regression method. Finally, an empirical formula is proposed to predict the buckling pressure of the composite cylinder shells, and the calculated results from the formula are in good agreement with the numerical results.

初始几何缺陷是影响复合圆柱壳在静水压力下屈曲行为的主要因素之一。在这项研究中，椭圆度和厚度变化作为几何缺陷的两种代表性类型被考虑在内。在测量几何缺陷后，对典型的碳纤维增强聚合物 (CFRP) 圆柱壳进行测试以获得屈曲压力。结合应变响应分析壳体样品的屈曲行为。通过非线性数值分析，首先讨论了不同椭圆度和厚度变化组合的CFRP圆柱壳的屈曲形状。然后通过非线性回归方法得到这些缺陷对屈曲压力的影响规律。最后，