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Fatigue and Fracture of Metals and Alloys: Numerical and Experimental Study (4th Edition)

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Metals and Alloys".

Deadline for manuscript submissions: 20 August 2026 | Viewed by 894

Special Issue Editor

Prof. Dr. Aiguo Zhao

E-Mail Website
Guest Editor
College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
Interests: acoustic metamaterials; mechanical metamaterials; fatigue and fracture
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The success of our previous three volumes of the Special Issue “Fatigue and Fracture of Metals and Alloys: Numerical and Experimental Study” underlines that the issues of fatigue and fracture are still open and require further research. This fact has encouraged us to create a fourth Special Issue under the same title that will further present state-of-the-art advances in fatigue and fracture of metals and alloys.

Fracture mechanics and fatigue constitute the basis of the knowledge canon of a modern mechanical engineer.  Knowledge of the issues in the field of fracture mechanics and fatigue enables the construction of durable and safe devices.

Fatigue and fracture can be analysed from different points of view. There is room here to study the structure of the material, influence of the environment, shape of the structural element, or type of load. Research can be conducted in the laboratory on real elements, but many analyses require a numerical approach that is often very advanced, thus requiring the creation of new tools. Similarly to the process of studying the phenomena accompanying fatigue and cracking, extremely expensive and innovative tools are required, which have been presented many times in the previous Issues.

Thus, we invite everyone who works in this area to present their latest findings that provide a better understanding of the fracture and fatigue processes. We hope that the presented papers will be met with the supportive interest of the community and will result in new, wonderful ideas, allowing for the rapid development in fracture mechanics and fatigue.

Prof. Dr. Aiguo Zhao
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 250 words) can be sent to the Editorial Office for assessment.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

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 mechanics
  • fatigue
  • constraint effect
  • digital image correlation
  • fatigue strength

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Published Papers (2 papers)

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18 pages, 7911 KB  
Article
Verification of the Applicability of the FAD Method Based on Full-Scale Pressurised Tensile Tests of Large-Diameter X80 Pipelines
by Xiaoben Chen, Ying Zhen, Hongfeng Zheng, Haicheng Jin, Rui Hang, Xiaojiang Guo, Jian Xiao and Hao Zhou
Materials 2026, 19(3), 465; https://doi.org/10.3390/ma19030465 - 23 Jan 2026
Viewed by 354
Abstract
The Failure Assessment Diagram (FAD), as a significant method for evaluating the suitability of defective metallic structures, has been subject to considerable debate regarding its applicability in assessing ring welded joints for high-grade steel and large-diameter pipelines. To address this issue, this study [...] Read more.
The Failure Assessment Diagram (FAD), as a significant method for evaluating the suitability of defective metallic structures, has been subject to considerable debate regarding its applicability in assessing ring welded joints for high-grade steel and large-diameter pipelines. To address this issue, this study first designed and conducted two sets of full-scale pressure-tension tests on large-diameter X80 pipeline ring welded joints, considering factors such as different welding processes, joint configurations, defect dimensions, and locations. Subsequently, three widely adopted failure assessment diagram methodologies—BS 7910, API 579, and API 1104—were selected. Corresponding assessment curves were established based on material performance parameters obtained from the ring weld tests. Finally, predictive outcomes from each assessment method were compared against experimental data to investigate the applicability of failure assessment diagrams for evaluating high-strength, large-diameter, thick-walled ring welds. The research findings indicate that, under the specific material and defect assessment conditions employed in this study, the API 1104 assessment results exhibited significant conservatism (two sets matched). Conversely, the BS 7910 and API 579 assessment results showed a high degree of agreement with the experimental data (eight sets matched), with the BS 7910 assessment providing a relatively higher safety margin compared to API 579. The data from this study provides valuable experimental reference for selecting assessment methods under specific conditions, such as similar materials, defects, and loading patterns. Full article
(This article belongs to the Special Issue Fatigue and Fracture of Metals and Alloys: Numerical and Experimental Study (4th Edition))
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13 pages, 3467 KB  
Article
Study on the Influence of the Surface Altered Layer on Fracture Initiation and Load-Bearing Capacity of Gouged Pipelines
by Hui Yang, Can He, Enming Zhang, Fuxiang Wang, Yuguang Cao and Ying Zhen
Materials 2026, 19(3), 462; https://doi.org/10.3390/ma19030462 - 23 Jan 2026
Viewed by 314
Abstract
To clarify the influence of gouge-induced altered layers on fracture initiation and load-bearing capacity of pipelines, X70 pipeline steel is taken as the research object. The geometry and partition of the altered layer are first determined by means of a micro-Vickers hardness array [...] Read more.
To clarify the influence of gouge-induced altered layers on fracture initiation and load-bearing capacity of pipelines, X70 pipeline steel is taken as the research object. The geometry and partition of the altered layer are first determined by means of a micro-Vickers hardness array and a threshold criterion, and its mechanical parameters are then obtained from small-scale tensile tests. The altered layer is subsequently embedded into a finite element model of a gouged pipe as an independent material domain, and the Gurson–Tvergaard–Needleman (GTN) damage model is employed to simulate damage evolution and crack propagation under pure internal pressure and combined internal pressure and tensile loading. The results indicate that, compared with the base metal, the yield strength and ultimate tensile strength of the altered layer increase by about 39% and 47%, respectively, while the elongation to failure decreases from 16% to 1.8%, exhibiting a typical “high-strength–low-ductility” behavior. When the altered layer is considered, the fracture initiation location under pure internal pressure shifts from the base metal to the altered layer, and the burst pressure decreases from 19 MPa to 16.5 MPa. Under the combined internal pressure and tensile loading, the peak load changes little, whereas the ultimate displacement is reduced by about 26.5%, leading to a marked loss of pipeline ductility. These findings demonstrate that the gouge-induced altered layer has a significant effect on the fracture initiation pressure, failure mode, and load-bearing characteristics of gouged pipes. Modeling it as an independent material domain in finite element analysis can more realistically capture the failure behavior and safety margin of gouged pipelines, thereby providing a more reliable theoretical basis for improving integrity assessment criteria for externally damaged pipelines. Full article
(This article belongs to the Special Issue Fatigue and Fracture of Metals and Alloys: Numerical and Experimental Study (4th Edition))
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