1China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2School of Water Consenvancy and Ecological Engineering, Nanchang Institute of Technology, Nanchang 330099, China
This paper is aimed at studying the method of predicting dangerous points of local wall-thinning penstock. To begin with, the proposed failure analysis method was proved to be reliable in combination with test results. Next, the volume ratio of the plastic zone when the pipes with local wall-thinning and pipes without defect are failed was regarded as the quantitative index of failure mode. Based on this, the corresponding relationship between the penstock failure mode and the geometric parameters of local wall-thinning was established. Moreover, the corresponding relationship between geometric parameters of local wall-thinning and the positions of dangerous point was disclosed in accordance with the equivalent stress distribution when the local wall-thinning penstock fails. According to the results, main dangerous points can be found near the axial boundary and the local wall-thinning center of local wall-thinning penstock.
Penstock, Local thinned defect, Dangerous point
Yang Zhang. Research on Dangerous Points of Local Wall-Thinning Penstock. International Journal of Frontiers in Engineering Technology (2021), Vol. 3, Issue 5: 10-16. https://doi.org/10.25236/IJFET.2021.030502.
 B.C. Mondal, A.S. Dhar (2017). Finite-element evaluation of burst pressure models for corroded pipelines. Journal of Pressure Vessel Technology, vol.139, no.2, p21-28.
 B.C. Mondal, A.S. Dhar (2015). Corrosion effects on the strength of steel pipes using FEA. Proceedings of the ASME 34th International Conference on Ocean, p1-7.
 X.Y. Fan, Y. Dan, Y. Gao (2016). Evaluation on local equivalent stress and plastic deformation for natural gas pipeline. Journal of Safety Science and Technology, vol.12, no.8, p136-138. (In Chinese)
 X. Ma, J. Li, T. Xue (2018). Study on stress and strain of pressure pipe with inner corrosion depression. Journal of Plasticity Engineering, vol.25, no.3, p268-273. (In Chinese)
 A.C. Benjamin, J.L.F. Freire, R.D. Vieira (2005). Burst tests on pipeline containing interacting corrosion defects. Proceedings of OMAE2005 24th international conference on offshore mechanics and arctic engineering, p403-417.
 X. Li, Y. Bai, C. Su (2016). Effect of interaction between corrosion defects on failure pressure of thin wall steel pipeline. International Journal of Pressure Vessels and Piping, vol.138, p8-18.
 J.F. Kiefner, W.A. Maxey, R.J. Eiber (1973). Failure stress levels of flaws in pressurized cylinders. Astm Special Technical Publication, vol.536, p461-481.