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RISS 인기검색어
- 검색키워드
- 저자 : 표수호(Sooho Pyo) (검색결과 3 건)
- 무료
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Sooho Pyo(표수호),Jimin Nam(남지민),Seungjun Lee(이승준),Youngho Seo(서영호),Yeung Sung Suh(서영성),Sunwoong Choi(최선웅) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Structural feasibility study on a Slidable One-Touch Extension (SOTE) fitting for profile- walled drainage and sewer pipes was performed. SOTE fitting was developed for the purpose of accommodating large thermal deformation that could occur during installation, which if not treated properly in design can cause problems such as loosening of the pipe and in some cases cracking of the support constraint. SOTE fitting assembly process was examined via virtual assembly to determine the structural soundness and thermal deformation behavior was investigated for its design efficiency and performance. For both analyses the finite-element method was utilized and corresponding experiments were also performed to support the findings. Finally, cyclic fatigue tests were carried out on fittings followed by the leak proof test to determine integrity of the SOTE fittings. Through analysis and experiments SOTE fitting was shown to perform its designed functions with required structural stability.
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고분자 파이프의 저속 균열성장 저항성 측정을 위한 노치 링 시험방법의 개발
표수호(Sooho Pyo),서영성(Yeong Sung Suh),최선웅(Sunwoong Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In recent times, as the use of polymeric materials in load bearing structural applications are increasing, the resistance to slow crack growth often becomes the measure of the long-term performance. This presentation describes the work on the development of the method to measure the resistance to slow crack growth under the condition of creep loading. Particular reference is made to polymeric structures of axial-symmetry, under sustained internal pressure, as in pressure pipes, which often requires the performance lifetimes of 50 years or longer against the slow crack growth damage. The stress intensity factors determined numerically were applied to the corresponding creep-rupture data, and showed that the proposed method is good for achieving the most effective slow crack growth. The method has been adapted as the new work item in the international standard test method and is under standardization development.
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Notched Ring Test 저속균열 시험편의 응력확대계수정식화
표수호,최선웅,Pyo, Sooho,Choi, Sunwoong 한국재료학회 2014 한국재료학회지 Vol.24 No.2
The Notched Ring Test(NRT) has proven to be very useful in determining the slow crack growth behavior of polyethylene pressure pipes. In particular, the test is simple and an order of magnitude shorter in experimental times as compared to the currently used Notched Pipe Test(NPT), which makes this method attractive for use as the accelerated slow crack growth test. In addition, since the NRT specimen is taken directly from the pipe, having maintained the cross-section, processing induced artifacts that would affect the slow crack growth behavior are not altered. This makes the direct comparison to the slow crack growth specimen in pipe from more meaningful. In this study, for comparison with other available slow crack growth methods, including the NPT, the stress intensity factor equation for NRT specimen was developed and demonstrated of its accuracy within 3% of that obtained from the finite element analysis. The equation was derived using a flexure formula of curved beam bending along with numerically determined geometric factors. The accuracy of the equation was successfully tested on 63, 110, 140, 160, 250, and 400 mm nominal pipe diameters, with crack depth ranging from 15 % to 45 % of the pipe wall thickness, and for standard dimensional ratio(SDR) of 9, 11, and 13.6. Using this equation the slow crack results from 110SDR11 NRT specimen were compared to that from the NPT specimen, which demonstrated that the NRT specimen was equivalent to the NPT specimen in creating the slow crack, however in much shorter experimental times.
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