Techno Press

Structural Engineering and Mechanics   Volume 11, Number 3, March 2001, pages 325-340
A direct modification method for strains due to non-conforming modes
Chang-Koon Choi, Keun-Young Chung and Tae-Yeol Lee(Korea)

Abstract     [Full Text]
    This paper addresses an efficient modification method that eliminates the undesirable effects of
strains due to various non-conforming modes so that the non-conforming element can pass the patch test
unconditionally. The scheme is incorporated in the element formulation to establish new types of non-conforming
hexahedral elements designated as NHx and NVHx for the regular element and variable node
element, respectively. Non-conforming displacement modes are selectively added to the ordinary
(conforming) element displacement assumptions to improve the bending behavior of the distorted solid
element. To verify the validation of proposed direct modification method and the improvement of element
behavior, several numerical tests are carried out. Test results show that the proposed method is effective
and its applications to non-conforming solid elements guarantee for the element to pass the patch test.
Key Words
    direct modification method; non-conforming modes; effective modification method; solid elements.
Chang-Koon Choi, Keun-Young Chung and Tae-Yeol Lee, Department of Civil Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701, Korea

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