A Study on the Fatigue Life Prediction for Bending Pipe

Abstract:

Mechanical structures with power sources experience repeated force produced by motors. As a result, the life of the pipes reduces and ultimately, the pipes collapse. In most cases, the U-shape pipe is made from a straight pipe by complicated bending work. During this work process, plastic deformation of the pipe produces residual stress in the pipe. The residual stress significantly affects the fracture behavior of the pipe. In this paper, fatigues tests of U-shape bending pipe are performed by uniaxial testing machine and residual stresses were evaluated by FEM analysis. So we established the relation between residual stress and fatigue life. And we suggested new equation for fatigue life prediction using the residual stress of U-shape bending pipe.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 2219-2225
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.2219
• Online since: December 2011
• Authors: Soo Park, Hui Hwan Kwon, Jae Mean Koo, Chang Sung Seok, Du Han Jung, Jin Yong Mo
• Keywords: Copper Pipe, Fatigue Failure, Fatigue Life Prediction, Residual Stress

References

[1] S. Y. Kim, C. S. Seok, H. I. Kim, C. H. Choi, J. Y. Mo and J. K. Lee : Evaluation of Fatigue Characteristic for U-shaped Copper Pipe, Conference of Korean Society of Mechanical Engineering (2006)

[2] KS D 5301 : Korean Standard Collection (2003)

[3] S. Y. Kim, H. H. Kwon, C. S. Seok, J. M. Koo and J. Y. Mo : Fatigue Life Prediction and Residual Stress Evaluation of U-shaped Pipe due to Curvature Radius, Korean Society for Precision Engineering (2010)

[4] ASTM E466 : Standard Practice for Conductiong force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials (2002)

DOI: 10.1520/e0466

[5] G. E. Dieter : Mechanical Metallurgy 3rd edition, Mcgraw hill Publishing Company (1990)