Fracture Mechanism and Fatigue Behaviour of Metallic Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 5243

Special Issue Editor


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Guest Editor
Department of Mechanical and Aerospace Engineering, Carleton University, Ottawa, ON K1S 5B6, Canada
Interests: fracture mechanics; failure analysis; structural engineering; weight function; constraints
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Special Issue Information

Dear Colleagues,

In recent decades, significant progress has been made in the understanding of the fracture mechanism and fatigue behavior of metallic materials. Recent developments in constraint-based fracture mechanics have enabled laboratory testing to better predict the fracture properties of actual full-scale engineering structures. On the other hand, progress in the understanding of the welding residual stresses, material inhomogeneity and complex geometries in welded joints have improved the modelling capacity of fatigue behaviors in welded structures. However, the structural integrity requirements for engineering structural components provide continuous challenges in the further investigation of the constraint effects on fracture mechanisms, as well as the fatigue behaviors of welded joints.

The aim of this Special Issue is to provide a collection of recent papers on experimental, computational and theoretical progress in fracture mechanism, and the fatigue behaviour of metallic materials, with a special focus on:

  • Fracture mechanism of metals accounting for constraint effects;
  • Fatigue behaviors of welded structures.

Short communications, full-length papers, and critical reviews are all welcome.

Prof. Dr. Xin Wang 
Guest Editor

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • fracture toughness
  • fatigue crack propagation
  • welded joints
  • weld residual stress
  • material inhomogeneity
  • constraint effect
  • specimen size effects
  • steel and aluminum alloys
  • brittle and ductile fracture mechanism

Published Papers (3 papers)

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Research

27 pages, 3475 KiB  
Article
Thermally Activated Crack Growth and Fracture Toughness Evaluation of Pipeline Steels Using Acoustic Emission
by Oleg G. Perveitalov, Viktor V. Nosov, Andrey M. Schipachev and Alexey I. Alekhin
Metals 2023, 13(7), 1272; https://doi.org/10.3390/met13071272 - 15 Jul 2023
Cited by 3 | Viewed by 1055
Abstract
The article presents an approach to assessing the fracture toughness of structural alloys based on thermally activated crack growth and recording acoustic emission signals. The kinetic and structural features of the stable growth of the initiated crack are estimated using a multilevel acoustic [...] Read more.
The article presents an approach to assessing the fracture toughness of structural alloys based on thermally activated crack growth and recording acoustic emission signals. The kinetic and structural features of the stable growth of the initiated crack are estimated using a multilevel acoustic emission model based on the time dependence of the logarithm of the cumulative acoustic emission count. The article provides an evaluation of the stable kinetic constants included in the equation of the thermal fluctuation steps of a crack according to literature sources and using the acoustic emission method. It is shown that parameters such as activation energy, activation area before the crack tip, and the rate of non-activation crack growth are stable and show a satisfactory correspondence between the reference literature and real experiments. The approach does not require a set of laboratory experiments to determine the empirical constants of traditional crack growth rate equations, and it also differs in that it takes into account the unique features of the destruction of a particular specimen or technological equipment and allows for a non-destructive assessment of fracture toughness. The values obtained are conservative. The concentration criterion of destruction requires further investigation. Full article
(This article belongs to the Special Issue Fracture Mechanism and Fatigue Behaviour of Metallic Materials)
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14 pages, 3992 KiB  
Article
Effect of Stress Ratio and Evaluation of Crack Sizes on Very-High-Cycle-Fatigue Crack Propagation Life Prediction of Carburized Cr-Ni Steel
by Yupeng Guo, Furong Chen, Bing Liu, Huan Yu and Hailong Deng
Metals 2022, 12(9), 1485; https://doi.org/10.3390/met12091485 - 8 Sep 2022
Cited by 5 | Viewed by 1529
Abstract
Carburized Cr-Ni steel is widely used in the manufacture of components in many fields due to excellent performance, of which the service life has been a concern. In order to investigate the high-cycle-fatigue and very-high-cycle-fatigue properties of carburized Cr-Ni gear steel, axial loading [...] Read more.
Carburized Cr-Ni steel is widely used in the manufacture of components in many fields due to excellent performance, of which the service life has been a concern. In order to investigate the high-cycle-fatigue and very-high-cycle-fatigue properties of carburized Cr-Ni gear steel, axial loading fatigue tests were performed by QBG-100 with stress ratios of −1, 0 and 0.3. The Generalized Pareto distribution was used to evaluate the inclusion size of carburized Cr-Ni gear steel. Based on the stress ratio and the evaluated crack size, a new fatigue life prediction model for carburized Cr-Ni gear steels was constructed. The results show that the S–N characteristics of carburized Cr-Ni gear steel represent the continuously descending tendency. Based on the long crack propagation threshold and the instability propagation threshold of carburized Cr-Ni gear steel, the sizes of FGA, fisheye and surface smooth area (SSA) can be evaluated, respectively. In addition, the maximum size of surface and interior inclusion of carburized Cr-Ni gear steel are 17.50 μm and 6.46 μm with a cumulative probability of 99.9%. By validating the new established model, the prediction result is acceptable according to the good consistency between the predicted life and the experimental life. Full article
(This article belongs to the Special Issue Fracture Mechanism and Fatigue Behaviour of Metallic Materials)
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17 pages, 5166 KiB  
Article
Stress Intensity Factors and T-Stress Solutions for 3D Asymmetric Four-Point Shear Specimens
by Mark Cohen and Xin Wang
Metals 2022, 12(7), 1068; https://doi.org/10.3390/met12071068 - 22 Jun 2022
Cited by 2 | Viewed by 1786
Abstract
In this paper, extensive three-dimensional finite element analysis is conducted to study an asymmetric four-point shear (AFPS) specimen: a widely used mixed-mode I/II fracture test specimen. Complete solutions of fracture mechanics parameters KI, KII, KIII, T11 [...] Read more.
In this paper, extensive three-dimensional finite element analysis is conducted to study an asymmetric four-point shear (AFPS) specimen: a widely used mixed-mode I/II fracture test specimen. Complete solutions of fracture mechanics parameters KI, KII, KIII, T11, and T33 have been obtained for a wide range of a/W and t/W geometry combinations. It is demonstrated that the thickness of the specimen has a significant effect on the variation of fracture parameter values. Their effects on the crack tip plastic zone are also investigated. The results presented here will be very useful for the toughness testing of materials under mixed-mode loading conditions. Full article
(This article belongs to the Special Issue Fracture Mechanism and Fatigue Behaviour of Metallic Materials)
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