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International Journal of Frontiers in Engineering Technology, 2021, 3(5); doi: 10.25236/IJFET.2021.030502.

Research on Dangerous Points of Local Wall-Thinning Penstock


Yang Zhang1,2

Corresponding Author:
Yang Zhang

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

Cite This Paper

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.


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