E3S Web Conf.
Volume 248, 20212021 3rd International Conference on Civil Architecture and Energy Science (CAES 2021)
|Number of page(s)||5|
|Section||Chemical Performance Structure Research and Environmental Pollution Control|
|Published online||12 April 2021|
Study on Stress Corrosion Characteristics of Drill Rod Joint Under Mechanical Effects
Xi’an Research Institute, China Coal Technology & Engineering Group Corp., Xi’an, 710077, China
* Corresponding author’s e-mail: firstname.lastname@example.org
Thanks to the complex underground environment that coal mines enjoy, drill rods for mining are vulnerable to corrosion during operation. To investigate the impact of the corrosion defects on the residual intensity of the drill rod, a relational expression of stress versus corrosion rate in the conditions of uniform and local corrosions is deduced based on the theory on mechanochemical effects; building on this, a spherical corrosion defect is developed in the joint of a φ73 mm drill rod while it is exerted with a make-up torque, an axial force and a bending moment. So it is found that, when the corrosion defect is under pressure, the bending moment plays a certain role to inhibit its increase, however when it is under tension, the bending moment plays the role to drive its increase so as to quicken its corrosion rate while the impact of the change in the corrosion detect depth is much greater than that of the radius. The result from the research provides a basis to evaluate the residual intensity of the drill rod and theoretical basis to protect drill rods from corrosion.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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