In this paper problems which exist in 4-node isoparametric element and the methods of improving the accuracy are summerized. The authors give brief review to these methods and discuss the approach to developing high accuracy element.
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任钧国,熊龙飞.低阶高精度单元的发展[J].国防科技大学学报,1998,20(4):109-114. Ren Junguo, Xiong Longfei. Development of Low Order Element with High Accuracy[J]. Journal of National University of Defense Technology,1998,20(4):109-114.