Adopting filament winding and co-curing technique, carbon fiber reinforced composite (CFRC) Isogrid stiffened cylinders (ISCs) were designed and manufactured. Revealed by experiments, CFRC ISC has multi-failure modes, including material failure, global instability, local buckling, rib crippling and end delamination. Failure criteria for the first four failure modes were proposed and applied to predict the failure load of specific ISC. Skin thickness, cell dimension, rib height, rib thickness and end strengthening scheme jointly decide the failure pattern and failure load of the ISC. Failure maps were deduced to figure out the optimizing route for lightweight design of ISC. Wrapped ends were suggested to restrict the end delamination failure mode which results in rather low and uncertain load carrying capacity.

采用长丝缠绕和共固化技术，设计制造了碳纤维增强复合材料（CFRC）Isogrid加强圆柱体（ISC）。通过实验显示，CFRC ISC具有多种失效模式，包括材料失效，整体失稳，局部屈曲，肋骨瘫痪和末端分层。提出了前四种失效模式的失效准则，并将其用于预测特定ISC的失效负荷。蒙皮厚度，孔格尺寸，肋骨高度，肋骨厚度和端部加固方案共同决定了ISC的破坏模式和破坏负荷。推导了故障图，以找出ISC轻量化设计的优化途径。建议使用缠绕的端部来限制端部分层失败模式，这会导致相当低且不确定的负载能力。