노치응력법에 의한 용접 연결부 피로수명 추정에 관한 연구
Estimation Fatigue Life of Weldments by Notch Stress Approaches
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This paper analyzes the fatigue-life of welded joints using the notch stress approach. In the notch stress approach, the notch effects are usually approximated by introducing weld-bead parameters for the local detailed weld joints. The actual bead shape is complex and 3-dimensional. It may also greatly influence the fatigue strength. In this study, the welded shape was modeled using a 3D-scanner. The critical distance method was adopted in the evaluation of the fatigue effective notch stress for the weldments. Fatigue life tests were performed to verify the present method of fatigue life estimation for two types of welded plates with longitudinal attachments. The estimated results of the present methods were applied to the results of the experiment. The results of the analysis showed that the scatter of fatigue-life for the experimental data expressed in the nominal stress was significantly reduced by applying the effective fatigue stress of the present study.
Abstract
This paper analyzes the fatigue-life of welded joints using the notch stress approach. In the notch stress approach, the notch effects are usually approximated by introducing weld-bead parameters for the local detailed weld joints. The actual bead shape is complex and 3-dimensional. It may also greatly influence the fatigue strength. In this study, the welded shape was modeled using a 3D-scanner. The critical distance method was adopted in the evaluation of the fatigue effective notch stress for the weldments. Fatigue life tests were performed to verify the present method of fatigue life estimation for two types of welded plates with longitudinal attachments. The estimated results of the present methods were applied to the results of the experiment. The results of the analysis showed that the scatter of fatigue-life for the experimental data expressed in the nominal stress was significantly reduced by applying the effective fatigue stress of the present study.
참고문헌 (12)
- 임성우, "용접구조물의 부식피로수명에 미치는 용접부 개선처리 효과", 한국해양공학회지, 22(2), pp.50~57 (2008), 한국해양공학회
- Bellet, D, "The Fatigue Behaviour of Three- Dimensional Stress Concentrations", International Journal of Fatigue, 27, pp.207~221 (2005)
- Neuber,H, "Theory of Notch Stresses: Priciples for Exact Calculation of Strength with Reference to Structural Form and Material" (1958), Springer Verlag
- Peterson, R.E, "Stress Concentration Factors" (1974), New York Wiley & Sons
- Radaj, D, "Fatigue Assessment of Welded Joints by Local Approaches" (2006), Woodhead Publ
- Susmel, L, "A Novel Formulation of he Theory of Critical Distances to Estimate Lifetime of Notched Components in the Medium-cycle Fatigue Regime", Fatigue and Fracture of Engineering Materials and Structures, 30, pp.567~581 (2007)
- Taylor, D, "Theory of Critical Distances-A New Perspective in Fracture Mechanics" (2007), Elsevier
- Taylor, D, "Some New Methods for Predicting Fatigue in Welded Joints", International Journal of Fatigue, 24, pp.509~518 (2002)
- 양박달치, "십자형 용접부 피로강도 산정을 위한 국부응력법의 비교연구", 대한조선학회 논문집, 47(4), pp.573~579 (2010), 대한조선학회
- 양박달치, "용접연결부의 실제 비드형상을 고려한 노치피로해석법", 대한조선학회 논문집, 46(4), pp.417~423 (2009), 대한조선학회
- Yang, P.D.C., "Fatigue Strength Assessment of Cruciform Joints by Local Stress Approaches", Proceeding of the Annual Autumn Meeting, Society of Naval Architects of Korea, pp.113~118 (2009)
- Yang, P.D.C, "Fatigue Assessment of Weldments with Longitudinal Attachments by the Notch Stress Approaches", Proceeding of the Annual Autumn Meeting, Society of Naval Architects of Korea, pp.1249~1253 (2010)