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Fatigue Behavior, Fracture and Optimization of Alloys and Composites

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

Deadline for manuscript submissions: 20 August 2026 | Viewed by 521

Special Issue Editors


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Guest Editor
College of General Aviation and Flight, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Interests: fatigue and fracture of composite; ceramic matrix composite; environmental barrier coatings; multiscale modelling; numerical simulation
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Interests: titanium alloy; nickel alloy; ferrite steel; fatigue; creep

Special Issue Information

Dear Colleagues,

Composite materials and alloys are increasingly vital in aerospace, automotive, renewable energy, and civil infrastructure due to their high strength-to-weight ratios and design flexibility. However, their performance under cyclic loading (fatigue), fracture mechanisms, and optimization strategies remain critical challenges. This Special Issue aims to gather cutting-edge research addressing the fatigue behavior, fracture toughness, damage progression, and multi-scale optimization of composite materials and alloys. Contributions may include experimental investigations, computational modeling (e.g., finite element analysis, machine learning), and novel design approaches to enhance durability and reliability. Topics of interest include, but are not limited to, the following:

  • Fatigue life prediction under variable loading conditions;
  • Fracture mechanics of fiber-reinforced and hybrid composites;
  • Fatigue Behavior, fracture mechanics, and optimization of alloys;
  • Microstructural damage mechanisms and non-destructive evaluation;
  • Multi-objective optimization for weight reduction and performance enhancement;
  • Environmental effects (temperature, moisture, UV) on long-term durability;
  • Additive manufacturing and sustainable composite development.

We encourage submissions from academia and industry that advance fundamental understanding or practical applications of composite materials and alloys.

Dr. Guangwu Fang
Prof. Dr. Huiqun Liu
Guest Editors

Manuscript Submission Information

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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

  • composites and alloys
  • fatigue behavior
  • fracture mechanics
  • damage tolerance
  • multi-scale modeling
  • optimization
  • additive manufacturing
  • durability
  • finite element analysis
  • machine learning

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Published Papers (1 paper)

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Research

13 pages, 4136 KB  
Article
Fatigue Failure Mechanism and Crack Growth Behavior of Ti-6Al-4V ELI Titanium Alloy Welded Joints
by Jiajun Liu, Yu Li, Shao-Shi Rui, Wei Chen and Chengqi Sun
Materials 2026, 19(11), 2301; https://doi.org/10.3390/ma19112301 - 29 May 2026
Viewed by 208
Abstract
Titanium alloy welded joints are key parts of deep-sea pressure hulls, which are subjected to fatigue loadings in service. In this study, axial fatigue tests, mode I fatigue crack growth tests, and mixed-mode I–II fatigue crack growth tests were conducted on the Ti-6Al-4V [...] Read more.
Titanium alloy welded joints are key parts of deep-sea pressure hulls, which are subjected to fatigue loadings in service. In this study, axial fatigue tests, mode I fatigue crack growth tests, and mixed-mode I–II fatigue crack growth tests were conducted on the Ti-6Al-4V ELI titanium alloy welded joint, and its fatigue failure mechanism and crack growth behavior is investigated and compared with the base material. The results show that the S–N curve of Ti-6Al-4V ELI titanium alloy welded joints has a very similar slope as the base material, but its fatigue performance is lower than the base material. However, the welded joints exhibit a higher resistance in the near-threshold region under mode I loading compared to the base material. Scanning electron microscope observation indicates that the fatigue crack mainly initiates from gas pores during welding for the Ti-6Al-4V ELI titanium alloy welded joints. Under mixed-mode I–II loading, the stress intensity factor range component ΔKI of welded joints is higher than that of the base material, and an equivalent stress intensity factor range model is proposed to describe the crack growth rate under both mode I and mixed-mode I–II loadings. The new model incorporates a parameter dependent on the mode mixity ratio defined by ΔKII/ΔKI in this paper, and it unifies the crack growth data well under mode I and mixed-mode I–II loadings. The paper indicates that the gas pores during welding are an important factor for the poor fatigue performance of Ti-6Al-4V ELI titanium alloy welded joints. Full article
(This article belongs to the Special Issue Fatigue Behavior, Fracture and Optimization of Alloys and Composites)
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