Generally, the internal forces of shells are analysed by the plate elements, but because of the slope discontinuity of internal boundaries, it always influences the accuracy of the solution.
一般常用薄板单元分析薄壳内力，但由于内部边界联接斜率的不连续性而影响到求解精度。
Stress raiser. A small flaw (internal or surface) or a structural discontinuity at which an applied tensile stress will be amplified and from which cracks may propagate.
一个小裂缝(内部或表面的)或者是结构不连续，在该处施加的拉伸应力将被放大，裂纹会扩展。
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