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J-積分을 利用한 幾何學的 不連續을 가진 構造物의 變形解析
安得滿,兪完錫,李時馥,鄭義峰 부산대학교 공과대학 1982 硏究報告 Vol.23 No.-
Using linear elastic fracture mechanics the displacements at the loading ponints are calculated in stepped tension specimens and in stepped bending specimens. The displacements in stepped bending specimens are analyzed using J-integral principle. The J-integral values are calculted using ninlinear finite element method. And the results are compared with experimental ones. In linear range, the correction displacement by LEFM gives very accurate solution. In the nonlinear range before occurring plastic hinge at the loading point the correction by J-integral gives satisfying solution.
선형 이방성 재료에서 J_k-적분을 이용한 응력확대계수 계산
안득만,최창연 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.59 No.-
선형 이방성 평면균열에서의 복합모드에 관한 Jk 를 계산한다. 본 논문에서는 경로독립적분 Jl 과 J2 와 응력확대계수 사이의 상호관계를 이용하여 계산하였으며 Jk 를 KI과 KII로써 간단히 표현한다. 이 결과로 선형이방성 재료에서 수치적으로 응력찰대계수를 구하여 본다. The Jk integral method for determing mixed mode stress intensity factors separately in the cracked anisotropic plate is developed. Stress intensity factors are indirectly determined from the value of J1 and J2. In this paper, the relationship among elastic constants are examined. Using these relationship the expression of J2 integral in terms of KI and KII is found to be very simple.
안득만 대한기계학회 1991 대한기계학회논문집 Vol.15 No.2
In this paper, the weight functions for the Mode I and Mode II in SEN(single edge notched) specimen are obtained by superposition of the displacement in the singular field of the Buckner type and the displacements by opposite tractions induced by the singular field. The stress intensity factors, $K_{I}$ and $K_{II}$ are calculated by the weight function theory in SEN specimen under the loading equivalent to uniform tension and shear at infinity in Griffith crack. And the results are compared with the exact solutions.s.