| 압축잔류응력이 판의 파괴 특성에 미치는 영향에 관한 실험적 평가 |
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장창두, 박용관, 송하철, 김병일 |
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| An Experimental Assessment of the Effects of Residual Stresses on Fracture Behavior of the Plate |
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Chang-Doo Jang, Yong-Kwan Park, Ha-Cheol Song, Byung-Il Kim |
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| Abstract |
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The quantitative assessment of the affect of the residual stress on fracture behavior was executed by some experiment and numerical analysis. First of all, artificial residual stresses were imposed on CT(Compact Tension) specimens by local heating using gas torch, and an appropriate distribution of residual stresses was obtained by thermal elastic-plastic FE analysis. To certify the result of the FE analysis, an experimental measurement was performed in accordance with ASTM standard. Fracture toughness test was executed on the several types of specimens. The first type was the specimen without residual stresses, and the others had different peak value of compressive residual stress at crack front via controlling the heat flux. All the test results were presented on the J resistance (JR) curves and discussed to verify the effect of compressive residual stresses on fracture behavior. |
| Key Words:
compressive residual stress;local heating;fracture toughness;JR curve;thermal elastic-plastic analysis |
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