复合材料船体帽型加筋板弯曲应力

Bending stress of composite hat-stiffened plates

复合材料船体结构主要由纵向或横向加筋板架构成,定量计算弯曲应力是复合材料帽型加筋板强度设计的前提。本文利用变形协调和卡氏定理给出了复合材料帽型加筋板的横向和纵向弯曲刚度和弯曲内力,以及三点弯曲梁和均布压力作用下四边简支板的弯曲应力解析表达式。通过三点弯曲试验实测复合材料帽型加筋层合板的弯曲应力;采用ABAQUS有限元软件计算三点弯曲梁和四边简支加筋板的弯曲应力,并与解析解比较。结果表明:解析解与数值计算及试验结果吻合较好,验证了复合材料帽型加筋板弯曲应力解析表达式的正确性;该解析表达式具有较好的计算精度,可作为复合材料帽型加筋板强度设计依据。

A composite hull is mainly composed of longitudinally-or transversely-stiffened plates.Quantita⁃tive calculation of bending stress is the precondition of strength design for composite hat-stiffened plates.The transverse and longitudinal bending stiffness and internal force of composite hat stiffened plates were ob⁃tained by using deformation compatibility and the Castigliano's theorem.The analytical expressions for bend⁃ing stress of three-point bending beams or simply-supported plates on four sides subjected to uniform pres⁃sure were derived.The bending stress of hat stiffened plates under three-point bending was measured via ex⁃perimental test.The bending stress of composite hat-stiffened plates was simulated by ABAQUS,including three point curved beams and stiffened plates simply supported at four sides.The testing and numerical re⁃sults were compared with the analytical solution.The results show that the analytical solution is in good agree⁃ment with the numerical simulation and experimental results,which verifies the correctness of the analytical expression for bending stress of composite hat-stiffened plates.The formula can be used as a calculation ba⁃sis for the design of composite hat-stiffened plates.