复合材料帽型加筋板等效弯曲刚度

Equivalent bending stiffness of composite hat-stiffened panel

复合材料船体结构主要由纵向或横向加筋板架构成,复合材料加筋板设计可以近似处理成正交异性板,需要定量计算复合材料加筋板的等效刚度。利用卡氏定理推导了复合材料帽型加筋层合板的纵向和横向弯曲刚度,给出了等效层合板弯曲刚度的解析表达式。通过复合材料帽型加筋层合板纵向和横向三点弯曲试验实测梁的跨中挠度并与等效弯曲刚度对应的解析解比较;用ABAQUS有限元软件计算三点弯曲纵向和横向复合材料帽型加筋梁和四边简支复合材料帽型加筋板中心点的挠度并与等效弯曲刚度对应的解析解比较。结果表明:解析解与数值计算及试验结果对比,吻合较好,验证了等效弯曲刚度解析表达式的正确性,且具有较好的计算精度,可作为复合材料帽型加筋板设计的计算依据。

The composite hull is mainly composed of longitudinally or transversely stiffened laminates.The design of composite stiffened laminates can be approximated as an orthogonal anisotropic plate and the equivalent stiffness of stiffened composite plates needs to be calculated quantitatively.The longitudinal and transverse bending stiffness of hat-stiffened panel were derived using the Castigliano's theorem.The analytical expressions for the equivalent bending stiffness were provided.The longitudinal and transverse three-point bending tests of the hatstiffened laminates were designed to measure the mid-span deflection of the beam and the obtained test data were compared with the analytical solution corresponding to the equivalent bending stiffness.The deflection at the center point of longitudinally and transversely hat-stiffened composite beam in three-point bending and the four-sided simply-supported hat-stiffened composite laminates was calculated by ABAQUS and compared with the analytical solution corresponding to the equivalent bending stiffness.The results show that the analytical solutions are in good agreement with the numerical calculations and the experimental results,which verifies the correctness of the analytical expression of the equivalent bending stiffness.It can be used confidently in the design of the hat-stiffened panel.