Transverse bending damage morphologies of carbon fiber composite tubes with different ply structures were investigated by the micro-XCT characterization. Structural effects of the plain, twill and winding on the damage mechanism were analyzed. The experimental results present fiber-resin cracking, interlayer delamination and fiber tows breakage with structural deformation from the peak load to final catastrophic failure. Woven fabric plies in the plain and twill composite tubes cannot be effectively slipped because of their tight interlaced structures, which makes the load propagate along the warp and weft fiber tows, resulting in more fiber tows breakage under bending-induced stretching. There is no interlaced effect on the failure mechanism for the winding tubes, resulting in a fact that the bending load can only be transferred from the fiber-resin or the layer-to-layer interface, with more interlaminar slippage and obvious springback behaviors under in-plane shear. For investigating the interlaced effect on failure mechanism, plain and winding models under transverse bending were established using continuous shell elements, and different constitutive description were used to simulate interlayer failure and intra-layer failure behaviors. By comparing the numerical results with the experimental ones, the influence of the fabric structure on the failure behavior of the tube were analyzed.

通过微观XCT表征研究了具有不同层结构的碳纤维复合材料管的横向弯曲损伤形态。分析了平原，斜纹和绕组对破坏机理的结构影响。实验结果表明，纤维树脂开裂，层间分层和纤维束断裂，以及从峰值载荷到最终灾难性破坏的结构变形。平纹和斜纹复合管中的机织织物层由于紧密的交错结构而无法有效地打滑，这使载荷沿着经纱和纬纱丝束传播，从而导致更多的纤维束在弯曲引起的拉伸下断裂。缠绕管的失效机理没有交错影响，结果导致弯曲载荷只能从纤维树脂或层与层的界面传递，层间滑移更大，在面内剪切下具有明显的回弹行为。为了研究隔行对破坏机理的影响，使用连续壳单元建立了横向弯曲下的平面模型和绕组模型，并使用不同的本构描述来模拟层间破坏和层内破坏行为。通过将数值结果与实验结果进行比较，分析了织物结构对管子破坏行为的影响。利用连续壳单元建立了在横向弯曲下的平面模型和绕组模型，并使用不同的本构描述来模拟层间破坏和层内破坏行为。通过将数值结果与实验结果进行比较，分析了织物结构对管子破坏行为的影响。利用连续壳单元建立了在横向弯曲下的平面模型和绕组模型，并使用不同的本构描述来模拟层间破坏和层内破坏行为。通过将数值结果与实验结果进行比较，分析了织物结构对管子破坏行为的影响。