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在简要介绍硬涂层材料应变依赖性的基础上,推导了用迭代有限元法求解硬涂层复合结构动力学特性的原理,进一步提出了求解硬涂层复合结构固有频率和振动响应的计算流程,即由振动响应值来修正硬涂层材料参数,进而迭代求解硬涂层复合结构的动力学参数.最后以一个涂敷MgO+Al2O3硬涂层的悬臂梁为例进行了实例研究,在考虑MgO+Al2O3硬涂层材料应变依赖性的基础上,获得了不同激励幅度下悬臂梁的固有频率和振动响应,并与线性计算结果进行了比对.结果表明;该硬涂层复合结构悬臂梁具有软式非线性,同时,对应于不同的激励幅度,迭代计算获得的共振响应相对于线性计算值减少了29%~48%,说明硬涂层材料的应变依赖性会进一步增强硬涂层的减振效果.
Based on the brief introduction of the strain dependence of the hard coating material, the principle of solving the dynamic characteristics of the hard coating composite structure by the iterative finite element method is deduced. The calculation flow of solving the inherent frequency and vibration response of the hard coating composite structure is further proposed , That is to say, the parameters of the hard coating material are modified by the vibration response value, and then the kinetic parameters of the hardcoat composite structure are iteratively solved.Finally, a case study of a cantilever beam coated with a hard coating of MgO + Al2O3 is taken as an example. The natural frequency and vibration response of cantilever beams with different excitation amplitudes were obtained based on the strain dependence of MgO + Al2O3 hard coating materials.The results were compared with the linear calculation results.The results show that the hard-coated composite cantilever beams With soft nonlinearity, corresponding to different excitation amplitudes, the resonance response obtained by iterative calculation is reduced by 29% -48% with respect to the linear calculation value, indicating that the strain dependence of the hard coating material will further enhance the hardness of the hard coating layer Vibration damping effect.