• 대한기계학회논문집
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• 제19권3호
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• pp.731-740
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• 1995

The objective of this paper is to develop defect assessment technology for integrity evaluation of CANDU pressure tubes. In fracture mechanics analysis, three-dimensional and two-dimensional (line-spring model) finite element analyses were performed to obtain the stress intensity factor for axial and circumferential surface cracks. In leak before break (LBB) analysis, heat transfer analyses for through-wall cracks were performed by considering the cooling effect and the LBB application time was computed. It was shown that the analytical results obtained in this study provide less-conservative but accurate solution for defect assessment of CANDU pressure tubes.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2005년도 추계학술대회 논문집
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• pp.440-443
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• 2005

Recently the usage of galvanealed steel sheet was increased in order to protect corrosion in automobile industry. So, the alternative of steel sheet was investigated in a point of formability. Generally it was known that uncoated steel sheet has better mechanical properties than coated steel sheet. But, contrary results were sometimes occurred in workplace. This reason is the effect of friction. In this study, the formability of steel sheet considering friction characteristics was investigated with tensile test, cup drawing test and finite element method.

• 한국재난정보학회 논문집
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• 제11권4호
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• pp.534-541
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• 2015

본 연구는 양단이 단순지지된 조건을 갖는 다층 원통쉘을 해석하는 방법을 제시하였고, 3차원 응력 특성을 규명한 것이다. 지배방정식은 편미분방정식을 상미분방정식으로 변환을 가정한 유한요소 개념을 이용하여 유한대판법 해석법을 이용하여 수치해서하였다. 특히 단순지지 조건을 갖는 3차원 다층원통쉘에 대해서는 시행함수로서 삼각함수로 구성되는 보의 고유함수로 구성되는 경우에 대해 해석하였다. 층 재료는 강재 또는 콘크리트로하고 층두께, 원통길이 등 파라메터를 다양하게 변화시켜 다층원통쉘에 미치는 영향을 검토한다.