由此得出，决定井眼轨迹的是钻头合位移方向，而不必是合力方向。
The trajectory of bore hole is proved to be formed by the resultant displacement of the bit instead of the resultant force.
并由复合材料板壳的广义内力公式和压电本构关系，导出压电层合壳的广义内力-位移-电场关系；
The formulas of general force displacement electric fields for piezoelectric laminated shell were derived according to the laminate theory and piezoelectric constitutive equations.
基于三阶折线位移模型，利用虚功原理导出了含初始平面应力的层合复合材料板的弯曲理论。
Based on the third order zigzag displacement model, a bending theory for laminated composite plates in an initially stressed state is derived by use of the principle of virtual work.
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