复合材料层板层间应力分析的非协调元方法

构造了一种非协调元方法，并用于复合材料层析间应力的分析。与常规的协调们移单元相比，非协调元能明显地提高计算精度，与杂交元相比又具有列式简单、计算效率较高的优点。非协调元属于单变量有限元，但从本质上补证明与杂交元存在等价性，因而具有多变量有限元的一些优点。在以往的复合材料层间应力分析中，单变量的们移元和多变量的杂交元比较多见。本文试图把非协调元应用于层间应力的分析。结果表明，这一方法兼有位移元和杂交

A Non-Conforming Finite Element Method for Analysis of Composite Laminates

A 3-D non-conforming element has been proposed,which is used to analyse the stress of interlaminates in composite material. Compared to the corn forming displacement model,the non-conforming one can offer a high accuracy. To the hybrid model, it has some advantages such as simple formulation and high computational efficiency. The non-conforming method is of single-variable FEM,but in the essential aspect it has been testified to be equal to the hybrid model. So it can fit the complex deformation of the laminates. The element studied in this paper is derived from the ordinarily used 3-D isoparameter element with 20 nodes. The edge effects have been analysed with the new element and the results show that it has a so high accuracy that nearly all the zero boundary conditions have been met.