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RISS 인기검색어
- 검색키워드
- 저자 : Mituru Ohata (검색결과 2 건)
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Pre-strain effect of on fracture performance of high-strength steel welds
안규백,박정은,Mituru Ohata,Fumiyoshi Minami 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
Fracture toughness of pre-strain effect was determined as a function of the temperature in structural steels of the 600 to 780 MPa class. Cyclic loading during earthquakes produces pre-strain in the component, which is enhanced at the region of strain concentration. During the Kobe Great Earthquake in 1995 in Japan, 10 to 15 % pre-strain was recorded at the beam-to-column connection. The relationship between critical CTOD and CGHAZ length was sampled by fatigue pre-crack for pre-strained HAZ, which is a significant decrease compared to that of the base metal. Furthermore, the effect of pre-strain is discussed in terms of the CTOD and Charpy impact energy of the local brittle zone.
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고강도강 용접부의 소성변형 정도에 따른 파괴안전성 평가
안규백(Gyubaek An),박정웅(Jeongung Park),Mituru Ohata,Fumiyoshi Minami 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.6
Fracture toughness of plastic strain (pre-strain) effect was determined as a function of the temperature in structural steels of the 600 to 780 MPa class. Cyclic loading during earthquakes produces plastic strain in the component, which is enhanced at the region of strain concentration. When the great earthquake occur, the steel structure 10-15% strain deformation was recorded at the beam-to-column connection. The steel structure fracture was more likely to occur. Therefore evaluate of plastic stain effect in steel structure to avoid unstable fracture especially in the weld joint (heat-affected zone; HAZ). The critical fracture toughness value (crack tip opening displacement, CTOD) in a large structure with plastic strain, which was applied to the HAZ region, was estimated from a small-scale plastic stained three-point bend specimen. The critical fracture toughness value is a very useful parameter to evaluate the safety of huge structural to avoid unstable fracture. In this study, it was proposed to critical fracture toughness value (CTOD) to avoid unstable fracture with each plastic strain effect.
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