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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1982, Vol. 3 ›› Issue (4): 36-40.

• 论文 • Previous Articles     Next Articles

9-NODE QUADRILATERAL ISOPARAMETRIC ELEMENT

Wu Yongli   

  1. Institute of Mechanics, Academia Sinica
  • Received:1982-02-01 Revised:1900-01-01 Online:1982-12-25 Published:1982-12-25

Abstract: Several Authors have presented numerical results which demonstrated the stiffening of 8-node and 12-node quadrilateral isoparametric elements when distorted from a rectangular shape. In consequence the error introduced by using distorted 8-node or 12-node quadrilateral isoparametric element is significant. The results obtained by distorted elements are essentially consistent with those obtained by undistorted elements if 9-node element is used as quadrilateral isoparametric element and Lagrange polynomials as interpolation functions. Numerical results show that 9-node isoparametric element is superior to 8-node isoparametric element, 12-node isoparametric element and quadrilateral element consisting of two or four linear strain triangles.