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초록·키워드
In previous studies, the impact fracture behaviors of bulk amorphous metals(BAM) was investigated. It was found that most of fracture energy absorbed was used in the process of crack initiation. In this study, the fracture toughness of BAM using the fatigue precracked subsize Charpy specimen was investigated. For impact fracture experiments, a newly devised instrumented impact testing apparatus was devised using semi-conductor gages attached on ?20 bar as a sensing part. A fatigue precrack was introduced to a/W 0.4. The impact absorbed energy in the Zr-BAM specimen with precrack was significantly low as compared with the notched Zr-BAM specimens. Less shear bands were developed near the precrack tip. The development of shear bands during crack propagation was also less as compared with the case of notched Zr-BAM specimen. At that time, the KIC in the precracked specimen was about 1㎫√m, which was much less when compared with the Kmax in the notched specimen which was about 90㎫√m.
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UCI(KEPA) : I410-ECN-0101-2009-550-016013652
