| 摘 要： | The midside node sensitivity of eight-node isoparametric element in3-D BEM isinvestigated.The paper points out that the suggestion,based upon which the midside nodesshould be located in the‘middle third’of distance between the adjacent corners,should befollowed even more strictly for the conventional isoparametric transformation(CIT)inBEM as that in FEM.A new coordinate transformation relation has been put forward tosolve the singular integral problem.The computation is carried to two cases:a cubic bodysubjected to tensile stress and pure bending.The numerical results show that the improvedisoparametric transformation(IIT)is easier and more flexible to practice.
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