The axial compressive bearing capacity, failure modes, and failure mechanisms of carbon fiber-reinforced aluminum laminate (CARALL) columns with single-channel cross sections were studied in detail. In this study, two types of short CARALL specimens with a 5/4 configuration were first fabricated using 2024-T3 aluminum alloy and different fiber orientations ([0°/90°/0°] 3 , [45°/0°/−45°] 3 ) via a pressure-molding thermal-curing forming process. The short CARALL columns were then subjected to static loading tests to determine their axial compressive behaviors in terms of ultimate bearing capacity and failure modes. Thereafter, the user-defined FORTRAN subroutine VUMAT, which is based on ABAQUS, was used to investigate the failure mechanism of the proposed CARALL columns. Meanwhile, based on the classic laminated panel mechanics theory, a theoretical method was proposed to predict the safe bearing capacity of the designed compressive CARALL columns. The results indicated that the ultimate failure of both types of short CARALL columns was a strength failure caused by the delamination of the layers. When the short CARALL columns were subjected to an axial compressive load, the fiber spread angle of the carbon fiber-reinforced polymer prepregs in the laminate panels had a significant influence on the resistance to interlaminar delamination. A smaller fiber layer angle resulted in greater resistance to interlaminar delamination. Setting a certain number of fiber layers with angles between 0° and 45° could increase the toughness of the compression column member against interlaminar shear delamination at the initial stage. Comparisons of the experimental, numerical, and theoretical results demonstrated good agreement, indicating that the proposed theoretical method is feasible for predicting the safe bearing capacity of CARALL columns with a single-channel cross section and can be applied to the design of compressive laminate pillar components.

中文翻译：

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单通道横截面CFRP-铝层压板的抗压承载力及破坏机理

详细研究了单通道截面碳纤维增强铝层压板的轴向压缩承载力，破坏模式及破坏机理。在这项研究中，首先使用2024-T3铝合金和不同的纤维取向（[0°/ 90°/ 0°] 3，[45°/ 0°/- 45°] 3）通过压力成型热固化成型工艺。然后，对短的CARALL圆柱进行静载荷测试，以根据极限承载力和破坏模式确定其轴向压缩行为。此后，使用基于ABAQUS的用户定义的FORTRAN子例程VUMAT来研究所提出的CARALL列的失效机理。同时，根据经典的层压板力学理论，提出了一种理论方法来预测设计的抗压CARALL柱的安全承载力。结果表明，两种类型的CARALL短柱的最终破坏都是由于层脱层引起的强度破坏。当短的CARALL柱承受轴向压缩载荷时，层压板中碳纤维增强的聚合物预浸料的纤维铺展角对层间抗分层性有显着影响。较小的纤维层角度导致对层间分层的更大抵抗力。设置一定数量的角度在0°和45°之间的纤维层可以增加压缩柱构件在初始阶段抵抗层间剪切分层的韧性。实验，数值，