In the paper we start with study of the dynamic finite element of interchanged thick/thin beams by using the displacement model. Then the triangle 9 DOF (degree of freedom) and rectangular 12 DOF dynamic finite elements of interchanged thick/thin plates are decided.
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周科健.厚/薄梁和板的通用动力有限单元[J].国防科技大学学报,1989,11(3):32-38. Zhou Kejian. The Dynamic Finite Element of Interchanged Thick/Thin Beams and Plates[J]. Journal of National University of Defense Technology,1989,11(3):32-38.