sub-parametric element

The thin finite strip method and thick finite method were expanded from regular shaped structures to irregular shaped structures with sub parametric finite strip method.

采用亚参条法分别将有限薄条法及有限厚条法由规则外形结构推广到不规则外形结构；还提出了一种模型，用于描述弹性常数矩阵随坐标的变化，并由此得到了变厚度纤维增强层合板的一种有限条解法。