In this study, the flexural bearing capacity and failure mechanism of carbon fiber-reinforced aluminum laminate (CARALL) beams with a double-channel cross-section and a 3/2 laminated configuration were experimentally and numerically studied. Two types of specimens using different carbon fiber layup configurations ([0°/90°/0°] 3 and [45°/0°/−45°] 3 ) were fabricated using the pressure molding thermal curing forming process. The double-channel CARALL beams were subjected to static three-point bending tests to determine their failure behaviors in terms of ultimate bearing capacity and failure modes. Owing to the shortcomings of the two-dimensional Hashin failure criterion, the user-defined FORTRAN subroutine VUMAT suitable for the ABAQUS/Explicit solver and an analysis algorithm were established to obtain a progressive damage prediction of the CFRP layer using the three-dimensional Hashin failure criterion. Various failure behaviors and mechanisms of the CARALL beams were numerically analyzed. The results indicated that the numerical simulation was consistent with the experimental results for the ultimate bearing capacity and final failure modes, and the failure process of the double-channel CARALL beams could be revealed. The ultimate failure modes of both types of double-channel CARALL beams were local buckling deformation at the intersection of the upper flange and web near the concentrated loading position, which was mainly caused by the delamination failure among different unidirectional plates, tension and compression failure of the matrix, and shear failure of the fiber layers. The ability of each fiber layer to resist damage decreased in the order of 90° fiber layer > 0° fiber layer > 45° fiber layer. Thus, it is suggested that 90°, 0°, and 45° fiber layers should be stacked for double-channel CARALL beams.

中文翻译：

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双通道CFRP-铝层压板的抗弯承载力及破坏机理

在这项研究中，对具有双通道横截面和3/2层压结构的碳纤维增强铝层压板（CARALL）梁的抗弯承载力和破坏机理进行了实验和数值研究。通过压力成型热固化成型工艺，制造了使用不同碳纤维铺层构型（[0°/ 90°/ 0°] 3和[45°/ 0°/ -45°] 3）的两种类型的样品。对双通道CARALL梁进行了静态三点弯曲测试，以根据极限承载力和破坏模式确定其破坏行为。由于二维Hashin破坏准则的缺点，建立了适用于ABAQUS / Explicit求解器的用户定义的FORTRAN子例程VUMAT，并建立了一种分析算法，以使用三维Hashin破坏准则获得CFRP层的渐进损伤预测。数值分析了CARALL梁的各种破坏行为和机理。结果表明，数值模拟与极限承载力和最终破坏模式的实验结果吻合，可以揭示双通道CARALL梁的破坏过程。两种双通道CARALL梁的最终破坏模式是在集中荷载位置附近的上翼缘和腹板的交点处的局部屈曲变形，这主要是由不同单向板之间的分层破坏引起的，基质的拉伸和压缩破坏，以及纤维层的剪切破坏。每个纤维层抵抗损坏的能力按90°纤维层> 0°纤维层> 45°纤维层的顺序降低。因此，建议为双通道CARALL光束堆叠90°，0°和45°的光纤层。