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对线圈炮的电枢在径、轴向复合非均布电磁荷载作用下的弹性屈曲问题进行了有限元分析。采用八节点等参元,建立了圆柱坐标下的计算模型,给出了电磁力的计算,处理了剪切锁定与荷载移置等问题,编写了完善圆柱薄壳的屈曲分析程序SBT。并对某五级炮的电枢进行了计算,获得了三个典型时刻的临界荷载。
The finite element analysis of the elastic buckling of the armature of the coil gun under radial and axial composite non-uniform electromagnetic loads was carried out. Eight-node isoparametric element is used to establish the calculation model under cylindrical coordinates. The calculation of electromagnetic force is given. Problems such as shear locking and load displacement are dealt with. A buckling analysis program SBT for cylindrical thin shells is developed. The armature of a five-stage gun was calculated and the critical loads at three typical moments were obtained.