Mode II Stress Intensity Factors for Circumferential Through-Wall-Cracked Pipes under Torsional Loading

Published on May 15, 2021in Engineering Fracture Mechanics3.426
· DOI :10.1016/J.ENGFRACMECH.2021.107786
Yifan Huang , Yifan Huang12
Estimated H-index: 12
Abstract In this study, a systematic three-dimensional finite element analyses (3D FEA) are performed to evaluate the Mode II stress intensity factor (SIF) for circumferential through-wall cracked pipe under torsion moment. A wide range of crack lengths and pipe radius over thickness ratios are considered. Empirical solution of the mid-thickness Mode II SIF is developed as functions of crack lengths and pipe sizes. The deviating angle and the effective SIF regarding a through-wall crack (TWC) under combined bending and torsion moments are further discussed. The research outcome can provide more computational efficiency in structural integrity assessment of pressurized pipes and tubular structures.
📖 Papers frequently viewed together
8 Citations
7 Authors (Han-Bum Surh, ..., Nam-Su Huh)
#1Yanlin Wang (RMIT: RMIT University)H-Index: 2
#2Weigang Wang (RMIT: RMIT University)H-Index: 5
Last. Chun-Qing Li (RMIT: RMIT University)H-Index: 10
view all 4 authors...
Abstract Mode I fracture mechanics has been relatively mature but mixed mode fracture mechanics continues to present challenges, in particular for ductile materials under multiaxial stresses. Since most engineering materials, e.g., metals, exhibit elasto-plastic or ductile behaviour and are subjected to inclined cracks and/or multiaxial loading, there is a well justified need to establish a solid understanding of their fracture behaviour under mixed modes. The intention of this paper is to criti...
4 CitationsSource
#1Jan Kraft (Technische Universität Darmstadt)H-Index: 1
#2Carl Fällgren (Technische Universität Darmstadt)H-Index: 1
Last. Michael Vormwald (Technische Universität Darmstadt)H-Index: 25
view all 3 authors...
Abstract The strain energy release rate is calculated numerically for cracks in shells from shell elements by using the modified crack closure integral. This enables the separation of individual strain energy release rates for the different crack opening modes and the calculation of the corresponding stress intensity factors for mixed mode loading situations. The presented formulas are validated by comparing numerical results for a 3d finite element model with results computed from a plane shell...
#1Kristen Rege (University of Stavanger)H-Index: 5
#2Jørgen Grønsund (University of Stavanger)H-Index: 1
Last. Dimitrios G. Pavlou (University of Stavanger)H-Index: 9
view all 3 authors...
Abstract Environmental loads acting on structures usually cause fatigue crack propagation under variable amplitude mixed-mode conditions. In order to better estimate the remaining fatigue life, the fatigue crack growth behaviour under these conditions needs to be studied. In this paper, an experimental study where mixed-mode I and II overloads are applied to a fatigue crack propagating under mixed-mode I and II constant amplitude loading, is presented. The overloads are found to cause fatigue cr...
5 CitationsSource
4 CitationsSource
#1Reza Ghafoori Ahangar (École Polytechnique de Montréal)H-Index: 1
#2Yves Verreman (École Polytechnique de Montréal)H-Index: 11
A numerical study of the parameters influencing the accuracy of computed stress intensity factor (SIF) values is presented in this article. Mode I SIFs of a through-thickness center crack are calculated by employing the displacement extrapolation method (DEM) of near-tip field extrapolation and the energy-based interaction integral method (IIM). The results are compared with an analytical solution, and some recommendations are provided to increase the accuracy of the calculated mode I SIFs. Opti...
4 CitationsSource
#1Chen Xing (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 1
#2Chuwei Zhou (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 7
Abstract A combination of sub-partition and substructure methods in finite element is developed to simulate the crack propagation in plate and shell structures. This method allows modeling arbitrary shape crack independent of element mesh and only the elements overlapping crack need to be operated. An element cut apart by a crack is sub-partitioned into ordinary sub-elements while an element enveloping crack tip is sub-partitioned into several singular sub-elements. The whole sub-elements consti...
7 CitationsSource
#1Xiaobo Ren (SINTEF)H-Index: 10
#2Bård Nyhus (SINTEF)H-Index: 15
Last. M. Hauge (Equinor)H-Index: 1
view all 4 authors...
Abstract Assessment of aged offshore structures based on current and historical data is a critical issue for the life extension of offshore structures. The leak-before-break (LBB) concept was first developed and applied in the nuclear power industry to ensure the safety of the pressurized components in nuclear power plants. This concept can also be applied as a robust and cost effective tool for structural integrity management of offshore structures that are either partly submerged (jackets, sem...
5 CitationsSource
#1S. H. Sajjadi (IAU: Islamic Azad University)H-Index: 2
#2M. J. Ostad Ahmad Ghorabi (IAU: Islamic Azad University)H-Index: 3
Last. Davood Salimi-Majd (IUST: Iran University of Science and Technology)H-Index: 10
view all 3 authors...
In this paper, in order to predict the crack growth direction and fracture load under mixed modes I and II loading, a new criterion is proposed. For this purpose, after reviewing existing criteria, an effective stress is defined so as to include the influential stress components in fracture and exclude insignificant ones. Moreover, investigations show that most criteria predict a certain angle of fracture in pure mode II independent of material properties, although the experimental results are n...
21 CitationsSource
4 CitationsSource
#1Xinjian DuanH-Index: 5
#2Min WangH-Index: 3
Last. Michael J. KozlukH-Index: 4
view all 3 authors...
Abstract A probabilistic structural integrity assessment framework utilizing a two-loop Monte Carlo simulation process is proposed. The process and interpretation of the results are demonstrated using an example of Steam Generator (SG) tubing with fretting flaws. Acceptance standards established using a 95/90/90 criterion (which represents 95% probability at 90th percentile with 90% one-sided confidence) is proposed and compared with the generally accepted deterministic and traditional probabili...
7 CitationsSource
Cited By0