By the use of iso-function method,stress modes of 8-node three-dimensional solid element made of on-axis orthotropic material are derived. By determining the zero-energy modes of piezoelectric multilayer element,eight stress modes on piezoelectric sub-element are obtained.4.
3．利用等函数方法推导了正交异性情况下的三维8节点单元所具有的应力模式，并依据多层层合单元的零能模式判据，得到最终具有8个应力模式的应力矩阵。
参考来源 - 压电层合板的杂交元方法·2,447,543篇论文数据，部分数据来源于NoteExpress
结果表明：在同一温度下，应变速率不同，材料的流变应力模式不同；
The results show that the model of deformation resisitance is different at the same deformation temperature and the different stain rate.
在利用能量协调条件构造应力模式时，最后的应力模式中含有矩阵的逆。
When the stress mode is constructed by energy compatibility condition, the last stress mode involves the inverse matrix.
本文讨论温度及湿度对不同应力模式下低密度聚乙烯(LDPE)薄膜电强度的影响。
The present paper discusses the effect of temperature and humidity on the electric strength of low-density polyethylene (LDPE) film for various stressing modes.
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