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최재강,안광주 한국산업안전학회 1997 한국안전학회지 Vol.12 No.3
To evaluate the elastic-plastic fracture toughness by this modified offset method, the origin of J-R curve is set with drawing the blunting line on the maximum point of the negative crack growth and R curve is modified by adding the blunting factor of the experimented point on the R curve. The elastic-plastic fracture toughness J_(IC) of A5083-H112 material by the modified offset method are 44kN/m on the smooth CT specimens.
최재강,임만배 한국산업안전학회 1998 한국안전학회지 Vol.13 No.4
In this study, under large scale yielding conditions crack propagation is found to governed by parameters based on the J-integral or on the crack opening displacement. But initiation of crack propagation of ductile material seems to be controlled by just on parameter that is the strain. The relationship between the critical value of J-integral and the local fracture strain in uniaxial tensile test in the region of maximum reduction in area. Therefore, the fundamental theoretical equation by the proposed elastic-plastic fracture toughness and the local fracture strain has a merit, in comparison with the ASTM method, which can measure by using the load-displacement curve and the specimens in tensile test.
제하컴플라이언스법에 의한 A5083 알루미늄합금의 탄소성파괴인성 평가
안광주,최재강 東義大學校 産業技術開發硏究所 1997 産業技術硏究誌 Vol.11 No.-
A 5083-H112 aluminum alloy in AI-Mg group is an important material and used for manufacturing a LNG tank which transports the liquified natural gas. In this investigation, the elastic- plastic fracture toughness of this material is evaluated by an unloading compliance method according to the ASTM E813-89 method on the smooth and side groove ?CT specimens. The effect of heat treatment (annealing and quenching) and welding is studied on the elastic-plastic fracture toughness. A modified offset method is proposed for the negative crack due to the negative crack effect.
금속 재료의 피로 균열 전파 속도(da/dN)평가를 위한 변형율 확대 계수의 유효성 검토
유재환,최재강,손종동 한국산업안전학회 1996 한국안전학회지 Vol.11 No.2
Fatigue fracture is the cyclic fracture phenomena at a very small local area near a crack tip. Therefore, the detailed quantitative experimental analysis about local cyclic strain distribution near a crack tip is prerequisite in order to make an effective parameter able to account for fatigue fracture problems. However, there are few reporta on detailed quantitative experimental analysis of a local cyclic strain distribution near a crack tip, because of experimental difficulties. In this study, the distribution of local fatigue strains near a fatigue crack tip was in detail studied using by fine dot grid strain measurement method. From these results, a single parameter, which characterizes local fatigue strain field, was proposed. In addition, this parameter was applied to evaluate the fatigue crack propagation rate.