基于广义混合有限元的压电复合材料层合板的数值分析

Analysis of piezoelectric composite laminates based on generalized mixed finite element

  • 摘要: 将纯弹性体的广义混合有限元法引入到压电材料的静力学分析中。由于采用了8节点六面体非协调实体单元对整体结构进行离散求解,摒弃了板壳理论中的诸多人为假设。非协调项的加入使该方法比同类协调元显示出更好的数值性能。本文方法将应力边界条件和位移边界条件同时考虑,并且求解过程中将层间应力和平面内应力分开处理,按每层的本构关系求解平面内应力,这样求得的层间应力和平面内应力都更加接近精确解。通过几个有代表性的层合板的数值算例说明了本文方法的精度,相较于传统的解析法和数值法,本文方法在适用性和有效性方面都具有优势。

     

    Abstract: Generalized mixed finite element method of pure elastomer was introduced into the static analysis of piezoelectric materials. Because the 8-node hexahedral noncompatible solid element was used to solve the whole structure discretely, many artificial assumptions in the theory of plate and shell were abandoned. The addition of noncompatible terms makes this method exhibit better numerical performance than the same kind of compatible elements. In this method, the stress boundary conditions and displacement boundary conditions were considered simultaneously, and the interlaminar stress and in-plane stress were treated separately in the solution process, and the in-plane stress was calculated according to the constitutive relation of each layer, so that the obtained interlaminar stress and in-plane stress are closer to the exact solution. The accuracy of the proposed method was illustrated by several representative numerical examples of laminates. Compared with the traditional analytical and numerical methods, the theoretical method presented in this paper has advantages in applicability and effectiveness.

     

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