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엔지니어링 플라스틱 소재의 피로특성에 대한 응용프로그램 개발
장천수(Cheon-Soo JANG),박범규(Bum-Gyu PARK),김철수(Chul-Su KIM),김정규(Jung-Kyu KIM) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this study, in order to perform more efficiently reliability design and integrity assessment of structural members, the relational database management program on the engineering plastics was constructed. This program contained 476 grades for 14 kinds of the engineering plastics and was developed using MS-access and MS-visualbasic. This program consists of 3 modules; search condition, probabilistic characteristics of material property, evaluation of P-S-N curve. We perform fatigue test for probabilistic durability analysis and this results input the database program to estimate P-S-N.
장천수(Cheon-Soo Jang),박범규(Bum-Gyu Park),김철수(Chul-Su Kim),김정규(Jung-Kyu Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Engineering plastics have applied to mechanical components and structures due to a sufficient mechanical, thermal characteristics and impact-absorptive properties. In order to assure the safety of mechanical components included engineering plastics such as the polyacetal, it is important to estimate the probabilistic strain-life (P-ε-N) curve considering the variation of fatigue characteristics. The fatigue strain controlled tests were conducted under constant 50% humidity and 23℃ condition by a universal testing machine at strain ratio, R=0. In this study, a practical procedure is introduced to determine and evaluate P-ε-N curves. The variation of fatigue properties in the polyacetal was found to be normal distribution using χ² and K-S test, when the probability distributions of a fatigue life were examined by a strain-life method.