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자료유형
학술저널
저자정보
저널정보
대한용접·접합학회 International Journal of Korean Welding Society International Journal of Korean Welding Society Vol.3 No.1
발행연도
2003.6
수록면
51 - 56 (6page)

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It is important to evaluate the fracture initiation behaviors of steel structure. It has been well known that the ductile cracking of steel would be accelerated by triaxial stress state. Recently, the characteristics of critical crack initiation of steels are quantitatively estimated using the two-parameters. that is, equivalent plastic strain and stress triaxiality, criterion. This study is paid to the fundamental clarification of the effect of notch radius, which can elevate plastic constraint due to heterogeneous plastic straining on critical condition to initiate ductile crack using two-parameters. Hense, the crack initiation testing were conducted under static loading using round bar specimens with circumferential notch. To evaluate the stress/strain state in the specimens was used thermal clastic-plastic FE-analysis.
The result showed that equivalent plastic strain to initiate ductile crack expressed as a function of stress triaxiality obtained from the homogeneous specimens with circumferential notched under static loading. And it was evaluated that by using this two-parameters criterion, the critical crack initiation of homogeneous specimens under static loading.

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Abstract

1.Introduction

2.Experimental methods

3.Ductile crack initiation behavior of homogeneous specimens under static loading

4.Applicability of tow-parameter ductle cracking criterion to homogeneous specimens under statoc loading in single tension

5.Conclusion

References

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