서지주요정보
드릴링 자유도를 가진 4절점 응축쉘요소의 개발 = A four-node degenerated shell element with drilling degrees of freedom
서명 / 저자 드릴링 자유도를 가진 4절점 응축쉘요소의 개발 = A four-node degenerated shell element with drilling degrees of freedom / 김지훈.
저자명 김지훈 ; Kim, Ji-Hun
발행사항 [대전 : 한국과학기술원, 1999].
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소장정보

등록번호

8009618

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 99013

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A new four-node degenerated shell element with drilling degrees of freedom(DOF) is proposed. It is shown that the Allman-type displacement fields can be extended to three dimensional displacement fields based on the beam theory. Using these approximated displacement fields, new displacement fields of a four-node degenerated shell element with drilling DOF are derived from those of an eight-node degenerated shell element. The assumed strain method is used for the transverse shear strains to circumvent the transverse shear locking. Conventional steps of calculating stiffness matrices are followed and 2x2 Gaussian quadratures are used. Through-thickness numerical integration is included in the formulation for the analysis of composite laminated shell problems. Two kinds of penalty energy functions are used to restrain two spurious modes. It is shown through numerical examples that the penalty energies do not deteriorate the element performance. Many numerical problems including the patch tests and benchmark tests are solved for investigating the performance of the proposed element. The element is passed for both the membrane patch test and the bending patch test. It is concluded that the element shows good accuracy for most of benchmark problems and is less sensitive to element distortions and can be applied reliably to thin or moderately thick shell problems. And the proposed element shows good accuracy for not only isotropic but also composite laminated structures. It should be noted that true drilling rotations can be calculated accurately by introducing the penalty function comprising rotations and the differentiated terms of displacements. Stiffened or folded structures are handled more conveniently by the proposed element which has six degrees of freedom per node.

서지기타정보

서지기타정보
청구기호 {DME 99013
형태사항 x, 97 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Ji-Hun Kim
지도교수의 한글표기 : 이병채
지도교수의 영문표기 : Byung-Chai Lee
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 59-64
주제 드릴링
응축쉘요소
4절점
대체변형률
Drilling
Degenerated shell element
Four-node
Assumed strain
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