基于OGDEN三阶模型的鼓型橡胶护舷非线性有限元分析及试验验证

根据材料拉伸试验结果,采用OGDEN三阶模型定义橡胶的超弹性特性,建立鼓型橡胶护舷非线性有限元分析模型,并进行了试验验证和性能分析,结果表明：试验结果和仿真结果具有良好一致性,证明了模型的正确性；护舷的吸能量随着压缩量的增加而稳定增长,反力变化可分为稳定增加、相对稳定、快速增加三个阶段；护舷中的铁片应力分布明显高于橡胶部分,最大应力的变化与护舷反力数值有很大相关性；护舷橡胶部分的MISES应力和最大主应变都随着压缩量的增加而线性增大,在第一阶段最大应力和应变从护舷外表面的上下拐角处转移到护舷中部对称面上,之后,随着压缩量的增加,护舷的最大应力和应变区域在这个对称面上开始由里向外发生缓慢转移。

Nonlinear finite element analysis and experimental verification of cell rubber fender based on OGDEN_N3 model

Nonlinear finite element analysis of cell rubber fender and corresponding experiment were presented in this paper. OGDEN_N3 model was used to describe the hyperelastic behavior of the fender rubber, according to the experimental results. The results showed that, the predicted results corresponded well with the experimental results. The absorbing energy increased with the increasing compression, while the reaction force profile could be divided into three stages: steadily increasing stage, steady stage and rapidly increasing stage. The stresses in the steel were higher than the ones in the rubber. The maximum stress was highly depend on the reaction force. The MISES stress and maximum principal strain in the rubber increased linearly with the increasing compression, whose location translated from the corner to center face in the first stage and then translate slightly from the inner to the outer area in the center face.