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초록·키워드 목차

Elastic-plastic fracture mechanics is popularly used for integrity evaluation of major components, however, it is not easy to extract standard specimens from operating facility. This paper examines how ductile fracture toughness is characterized by a small punch testing technique in conjunction with finite element analyses incorporating a damage model. At first, micro-mechanical parameters constituting Rousselier model are calibrated for typical nuclear materials using both estimated and experimental load-displacement (P-?) curves of miniaturized specimens. Then, fracture resistance (J-R) curves of relatively larger standard CT specimens are predicted by finite element analyses employing the calibrated parameters and compared with corresponding experimental ones. It was proven that estimated results by the proposed method using small punch specimen is promising and might be used as a useful tool for ductile crack growth evaluation. #Damage Model(손상모델) #Ductile Fracture(연성파괴) #Fracture Resistance Curve(파괴저항곡선) #Small Punch Specimen(소형펀치 시편)

Abstract
1. 서론
2. 소형펀치 실험
3. 소형펀치 해석
4. 파괴저항곡선 예측
5. 결론
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