Fatigue and Fracture of Anisotropic Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 3132

Special Issue Editors


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Guest Editor
School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
Interests: fracture mechanics; fatigue crack propagation; constraint effects; structural integrity assessment
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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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Guest Editor
College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
Interests: anisotropic behaviour; crystal plasticity; strain incompatibility; digital image correlation method; fatigue

Special Issue Information

Dear Colleagues,

Anisotropic materials, which exhibit varying mechanical properties in different directions, are omnipresent in our modern industry. From traditional rolled alloys to single crystals used at high temperatures, to increasingly popular additive manufacturing materials, anisotropy plays a fundamental role in shaping material performance and structural integrity. Consequently, understanding the mechanical behaviours of anisotropic materials is a paramount concern with broad implications across multiple disciplines.

The mechanical response of anisotropic materials is closely related to their microstructure, loading conditions, and service environment. Over the past few decades, there has been extensive reporting on the anisotropic mechanics and deformation behaviours exhibited by crystal materials. However, most of the current research primarily concentrates on common mechanical properties and deformation. There is a lack of research on the mechanical behaviour of anisotropic materials in complex mechanical environments, especially in clarifying fracture, fatigue crack propagation, fatigue damage, and failure mechanisms through advanced characterization methods and numerical analysis models.

It is with great pleasure and enthusiasm that we introduce this Special Issue dedicated to the exploration of "Fatigue and Fracture of Anisotropic Materials". As the guest editors of this issue, we would like to extend our warmest welcome to all contributors and readers who share our passion for advancing our understanding of the complex mechanical behaviours of anisotropic materials.

This issue brings together a collection of research articles and case studies that delve into the anisotropic material fatigue and fracture behaviour. From experimental investigations unravelling the fatigue life of anisotropic materials to numerical simulations elucidating crack propagation in anisotropic solids, this Special Issue showcases the diversity and richness of research within this field. Key areas of interest covered in this issue include but are not limited to:

(a) Fatigue behaviour and life prediction of anisotropic materials;

(b) Fracture mechanics and crack propagation in anisotropic solids;

(c) Experimental techniques and testing methodologies for anisotropic materials;

(d) Damage mechanics and failure criteria for anisotropic structures;

(e) Numerical modelling and simulation of anisotropic material.

I look forward to receiving your contributions.

Dr. Zheng Liu
Prof. Dr. Xin Wang
Dr. Shengkun Wang
Guest Editors

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Keywords

  • anisotropic behaviour
  • fracture mechanics
  • fatigue crack propagation
  • fatigue
  • fracture toughness test
  • size effect
  • failure analysis
  • fatigue damage mechanism
  • crystal plasticity
  • strain incompatibility
  • slip and twining behaviour
  • digital image correlation method
  • stress–strain response
  • orientation analysis
  • structural engineering
  • finite element analysis
  • engineering metallic materials
  • deformation analysis
  • multiscale simulation
  • microscopic characterization

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Published Papers (2 papers)

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Research

14 pages, 6611 KiB  
Article
A Relationship between Fracture Toughness Kc and Energy Release Rate Gc According to Fracture Morphology Analysis
by Haohao Liu, Jinlun Yan, Aofei Li, Zhenyu He, Yuchen Xie, Han Yan and Dawei Huang
Crystals 2024, 14(8), 740; https://doi.org/10.3390/cryst14080740 - 20 Aug 2024
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Abstract
This study investigated the relationship between fracture toughness (Kc) and energy release rate (Gc) through fracture morphology analysis, emphasizing the critical role of fractal dimensions in accurately characterizing fracture surfaces. Traditional linear elastic fracture mechanics (LEFM) models relate Gc [...] Read more.
This study investigated the relationship between fracture toughness (Kc) and energy release rate (Gc) through fracture morphology analysis, emphasizing the critical role of fractal dimensions in accurately characterizing fracture surfaces. Traditional linear elastic fracture mechanics (LEFM) models relate Gc to Kc by combining energy principles with the nominal area of the fracture surface. However, real materials often exhibit plasticity, and their fracture surfaces are not regular planes. To address these issues, this research applied fractal theory and introduced the concept of ubiquitiform surface area to refine the calculation of fracture surfaces, leading to more accurate estimates of Gc and Kc. The method was validated through standard compact tensile specimen tests on a nickel-based superalloy at 550 °C. Additionally, the analysis of fractal dimension differences and dispersion in various fracture regions provides a novel perspective for evaluating the fracture toughness of materials. Full article
(This article belongs to the Special Issue Fatigue and Fracture of Anisotropic Materials)
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15 pages, 6194 KiB  
Article
Analysis of the Anisotropic Cyclic Material Behavior of EN AW-1050A H24 Derived from Strain-Controlled Testing Using a Clip-On Extensometer and an Optical System
by Tim Korschinsky, Benjamin Möller, Marvin Kiel and Matthias Hecht
Crystals 2024, 14(8), 686; https://doi.org/10.3390/cryst14080686 - 27 Jul 2024
Viewed by 1932
Abstract
Due to its good conductive properties, unalloyed (pure) aluminum, such as EN AW-1050A H24, finds new fields of application in electromobility. To optimize components, the cyclic material behavior must be understood and described precisely as a foundation of a proper fatigue life estimation. [...] Read more.
Due to its good conductive properties, unalloyed (pure) aluminum, such as EN AW-1050A H24, finds new fields of application in electromobility. To optimize components, the cyclic material behavior must be understood and described precisely as a foundation of a proper fatigue life estimation. Various cyclic tests were performed to not only derive the cyclic parameters to describe the material but also to find the most suitable procedure to deal with the challenges faced during the experiments. The main point of interest is the comparison between a surface-mounted clip-on extensometer and an optical system both used for strain control in cyclic tests. For the analysis of the anisotropic behavior of EN AW-1050A H24, un-notched flat specimens were extracted from sheet metal lengthways and crossways in respect to the rolling direction. While the cyclic material behavior for specimens of both directions of extraction is characterized by cyclic softening in general, the specimens extracted crossways show a strain-amplitude-dependent cyclic softening with strong strain localization especially at the contact points of the knives of the clip-on extensometer leading to an increased quantity of invalid experiments as well as sudden fractures. In the study, it was possible to show the benefits of a contactless optical strain control system when dealing with very soft metallic materials such as EN AW-1050A H24. Full article
(This article belongs to the Special Issue Fatigue and Fracture of Anisotropic Materials)
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