Abstract To analysis the failure and energy absorption of carbon fiber reinforced polymer (CFRP) thin-walled square tube, the quasi-static axial compression loading tests are conducted for [±45]3s square tube, and the square tube after test is scanned to further investigate the failure mechanism. Three different finite element models, i.e. single-layer shell model, multi-layer shell model and stacked shell mode, are developed by using the Puck 2000 matrix failure criterion and Yamada Sun fiber failure criterion, and three models are verified and compared according to the experimental energy absorption metrics. The experimental and simulation results show that the failure mode of [±45]3s square tube is the local buckling failure mode, and the energy are absorbed mainly by intralaminar and interlaminar delamination, fiber elastic deformation, fiber debonding and fracture, matrix deformation cracking and longitudinal crack propagation. Three different finite element models can reproduce the collapse behaviours of [±45]3s square tube to some extent, but the stacked shell model can better reproduce the failure mode, and the difference of specific energy absorption (SEA) is minimum, which shows the numerical simulation results are in better agreement with the test results.

中文翻译：

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准静态压缩载荷下复合薄壁方管破坏与吸能的实验与数值研究

摘要 为分析碳纤维增强聚合物（CFRP）薄壁方管的失效和吸能，对[±45]3s方管进行了准静态轴向压缩加载试验，并对试验后的方管进行扫描，得到进一步研究失效机制。利用Puck 2000矩阵破坏准则和Yamada Sun纤维破坏准则建立了单层壳模型、多层壳模型和叠层壳模型三种不同的有限元模型，并根据以下三个模型进行了验证和比较。实验能量吸收指标。实验和模拟结果表明，[±45]3s方管的破坏模式为局部屈曲破坏模式，能量主要通过层内层间分层、纤维弹性变形、纤维脱粘和断裂、基体变形开裂和纵向裂纹扩展。三种不同的有限元模型可以在一定程度上再现[±45]3s方管的坍塌行为，而叠壳模型可以更好地再现破坏模式，并且比能量吸收（SEA）差异最小，表明数值模拟结果与试验结果比较吻合。