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기술보고서

기술보고서 게시판 내용
타이틀	Modeling Progressive Failure of Bonded Joints Using a Single Joint Finite Element
저자	Stapleton, Scott E.;; Waas, Anthony M.;; Bednarcyk, Brett A.
Keyword	BONDED JOINTS;; COMPOSITE MATERIALS;; EMBEDDING;; FINITE ELEMENT METHOD;; MATHEMATICAL MODELS;; NONLINEARITY;; SHAPE FUNCTIONS
URL	http://hdl.handle.net/2060/20110000526
보고서번호	NASA/TM-2010-216824
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Enhanced finite elements are elements with an embedded analytical solution which can capture detailed local fields, enabling more efficient, mesh-independent finite element analysis. In the present study, an enhanced finite element is applied to generate a general framework capable of modeling an array of joint types. The joint field equations are derived using the principle of minimum potential energy, and the resulting solutions for the displacement fields are used to generate shape functions and a stiffness matrix for a single joint finite element. This single finite element thus captures the detailed stress and strain fields within the bonded joint, but it can function within a broader structural finite element model. The costs associated with a fine mesh of the joint can thus be avoided while still obtaining a detailed solution for the joint. Additionally, the capability to model non-linear adhesive constitutive behavior has been included within the method, and progressive failure of the adhesive can be modeled by using a strain-based failure criteria and re-sizing the joint as the adhesive fails. Results of the model compare favorably with experimental and finite element results.