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강동명(Dong-Myung Kang),김재수(Jae-Su Kim),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A torque converter consists of the hydrodynamic clutch device and the lock-up clutch device and the piston element is the name of the lock-up clutch. To improve operation capacity, when designed this element optimally, it is needed a control of the precise flatness respect to the piston. Therefore, in case of using a Coining method of construction to the piston, the optimum design was performed to insure durability through the structural analysis of it.
김용수,신근하,강동명 서울産業大學校 1991 논문집 Vol.34 No.1
The retardation effect of fatigue crack propagation after cyclic overloading seems to be affected by strain hardening exponent. Namely, for the material with high values of n, the delay effect is found to be severe. We proposeds a modified crack retardation equation which may apply the retardation of fatigue crack growth after a cyclic overloading, as ?? where, ?? is effective stress ratio ??. The constants μ= - 0.5 and λ= 0.6, and the values are found to be identical for materials such as aluminum (A 1060), steel (SS 34), brass (BsS1B) and stainless steel (SUS 304) used in this investigation.