Volume 23, Issue 2 (February 2023)
Modares Mechanical Engineering 2023, 23(2): 81-91 |
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Gholami Moghaddam S, Hashemi S. Experimental measurement of critical crack tip opening angle in API X65 steel using drop weight tear test specimen. Modares Mechanical Engineering 2023; 23 (2) :81-91
URL: http://mme.modares.ac.ir/article-15-63867-en.html
URL: http://mme.modares.ac.ir/article-15-63867-en.html
1- University of BIrjand
2- University of Birjand ,shhashemi@birjand.ac.ir
2- University of Birjand ,
Abstract: (1272 Views)
The critical Crack Tip Opening Angle (CTOAc) is considered as a convenient parameter to characterize the crack arrest toughness of natural gas pipeline. Load-displacement curve is a comprehensive reflection of geometry, mechanical property and fracture behavior of a loaded specimen, so it would be highly advantageous to deduce (CTOAc) from load-displacement curve directly. From force-displacement curves, maximum force of 209kN and 207kN were obtained for experimental and numerical data, respectively. In this article, a combination of load-displacement and deformation of the drop weight tear test specimen was used to calculate the critical crack tip opening angle. For this purpose, the simplified single-specimen test method was used. The (CTOAc) is dependent on the slope of the steady-state crack growth region and the plastic rotation factor. Firstly, based on the fact that load decreases linearly with the increment of displacement during steady-state crack growth, the slope of the experimental load-displacement curve of API X65 steel in the steady-state crack growth region was obtained as 21.583. Secondly, by modeling the drop weight tear test in Abaqus software and using two methods of mises stress and neutral axis, the plastic rotation factor was obtained as 0.5688 and 0.5651, respectively. Finally, these
parameters were used and the critical crack tip opening angle was determined as 12.00 and 12.08 degrees.
parameters were used and the critical crack tip opening angle was determined as 12.00 and 12.08 degrees.
Keywords: Crack tip opening angle, API X65 Steel, Drop weight tear test, Simplified single-specimen method, Plastic rotation factor, Crack arrest toughness.
Article Type: Original Research |
Subject:
Impact Mechanics
Received: 2022/08/28 | Accepted: 2022/12/1 | Published: 2023/01/30
Received: 2022/08/28 | Accepted: 2022/12/1 | Published: 2023/01/30
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