碳纤维复材-铝合金双槽形截面层合板梁承载性能预测研究

RESEARCH ON METHODS FOR PREDICTING BEARING PERFORMANCE OF CFRP-ALUMINUM LAMINATE BEAM WITH DOUBLE-CHANNEL CROSS SECTION

为了研究具有双槽形异型截面的碳纤维增强铝合金层合板梁的弯曲承载性能,采用压力模压热固化成形工艺制备了两组碳纤维铺层结构分别为[0°/90°/0°]和[45°/0°/-45°]的双槽形截面层合板梁构件,进行了四点弯曲试验,获得了不同试件的极限弯曲荷载和破坏模式。针对二维Hashin失效准则的局限性,采用FORTRAN语言编写了适用于ABAQUS/Explicit显式分析算法的VUMAT子程序,实现了基于三维Hashin失效准则的CFRP层渐进损伤的数值模拟分析功能,对双槽形层合板梁的承载性能和破坏形式进行了分析。同时,基于经典层合板理论提出了一种预测碳纤维增强铝合金层合板梁安全承载力的理论方法。试验、数值模拟与理论计算结果的比较表明,所提出的安全承载力计算方法可用于预测碳纤维增强铝合金槽形截面层合板梁的安全承载力,可应用于异形截面层合板梁构件的设计。

In this paper,flexural bearing capacity 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°]and[45°/0°/-45°])were fabricated by the pressure molding thermal curing forming process.The double-channel CARALL beams were then subjected to static four-point bending tests to determine their ultimate behaviors in terms of ultimate bearing capacity and failure modes.In view of the shortcomings of two-dimensional Hashin failure criterion,the user-defined FORTRAN subroutine VUMAT suitable for ABAQUS/Explicit solver and analysis algorithm was established to obtain a progressive damage prediction of CFRP layer based on three-dimensional Hashin failure criterion.The bearing capacity and failure modes of the proposed CARALL beams with double-channel cross-section were then numerally analyzed.Meanwhile,a theoretical method for predicting the safe bearing capacity of CARALL beams was proposed based on the classic laminate theory.Comparisons of the experimental,numerical,and theoretical results demonstrated good agreement,indicating that the proposed theoretical method was feasible for predicting the safe bearing capacity of CARALL beams with double-channel cross section and could be applied to the design of laminate beam components with special-shaped section.