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Fracture Behaviour of Structural Materials

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

Deadline for manuscript submissions: closed (20 August 2024) | Viewed by 2824

Special Issue Editor


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Guest Editor
1. Institute of Physics of Materials, Czech Academy of Sciences, Brno, Czech Republic
2. Institute of Materials Science and Engineering, Brno University of Technology, Brno, Czech Republic
Interests: steels; intermetallics; light-weight alloys and their composites; high-entropy alloys; fracture resistance of metallic materials; ceramics and ceramic matrix composites; microstructure vs. materials performance under mechanical loading
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Special Issue Information

Dear Colleagues,

In the development of new (advanced) materials, fracture resistance characteristics, morphology of the fracture surfaces, and quantitative effects of the individual microstructural constituents on these characteristics are often crucial in assessing the applicability of the material in appropriate structural applications. Fracture surfaces of mechanical test specimens (e.g., after fracture toughness tests) and/or components can be considered a "reading book" on the microstructural state of the material, its performance under mechanical loading, and the strength-to-toughness trade off. Understanding the phenomena of failure of materials enables the improvement of mechanical properties through the use of new manufacturing technologies, including additive technology, or through the invention of new materials that meet the desired requirements.

For advanced materials, when using both traditional ferrous and non-ferrous alloys, such an approach can only provide tools for their further development and optimisation. For advanced types of multi-materials (e.g., materials with internal architecture), when using various metal matrix composites, etc., such an approach can also be successfully applied, even though the fracture performance and corresponding fracture properties have been shown to be different from traditional materials. For conventional structural materials, especially when recycling scrap, this means that the effect of impurities and non-metallic inclusions must be investigated. Therefore, it seems necessary to investigate the micromechanisms and micromechanics of fracture in the context of microstructure and to further develop a methodology for such approaches.

The aim of this Special Issue, titled "Fracture Behaviour of Structural Materials", is therefore to summarise the findings in this field obtained with different metallic materials and metal-matrix composites, each with an emphasis on accurate interpretation and also with an attempt/suggestion to generalise and/or transfer the findings to materials other than those covered in the respective paper. The aim of this Special Issue is to provide a collection of contributions on case studies, recent findings, and advancements, and to highlight new trends in the field of fracture with particular emphasis on the micromechanisms (and micromechanics) of fracture.

Of great interest are original articles, communications, as well as review articles describing the current state of research in the indicated field.

Prof. Dr. Ivo Dlouhý
Guest Editor

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Keywords

  • fracture
  • fatigue
  • micromechanisms
  • micromechanics
  • steels
  • metallic materials
  • metal matrix composites
  • fractography

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Published Papers (2 papers)

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Research

17 pages, 23090 KiB  
Article
Microstructural Dependence of the Impact Toughness of TP316H Stainless Steel Exposed to Thermal Aging and Room-Temperature Electrolytic Hydrogenation
by Ladislav Falat, Lucia Čiripová, Viera Homolová, Miroslava Ďurčová, Ondrej Milkovič, Ivan Petryshynets and Róbert Džunda
Materials 2024, 17(17), 4303; https://doi.org/10.3390/ma17174303 - 30 Aug 2024
Viewed by 816
Abstract
This work deals with the effects of two individual isothermal aging experiments (450 °C/5000 h and 700 °C/2500 h) and the subsequent room-temperature electrolytic hydrogen charging of TP316H stainless steel on its Charpy V-notch (CVN) impact toughness and fracture behavior at room temperature. [...] Read more.
This work deals with the effects of two individual isothermal aging experiments (450 °C/5000 h and 700 °C/2500 h) and the subsequent room-temperature electrolytic hydrogen charging of TP316H stainless steel on its Charpy V-notch (CVN) impact toughness and fracture behavior at room temperature. Microstructural analyses revealed that aging at 700 °C resulted in the abundant precipitation of intermediary phases, namely, the Cr23C6-based carbide phase and Fe2Mo-based Laves phase, whereas aging at 450 °C resulted in much less pronounced precipitation of mostly intergranular Cr23C6-based carbides. The matrix phase of 700 °C-aged material was completely formed of austenitic solid solution with a face-centered cubic (FCC) crystal structure, whereas an additional formation of ferritic phase with a base-centered cubic (BCC) structure was detected in 450 °C-aged material. The performed microstructure observations correlated well with the obtained values of CVN impact toughness, i.e., a sharp drop in the impact toughness was observed in the material aged at 700 °C, whereas negligible property changes were observed in the material aged at 450 °C. The initial, solution-annealed (precipitation-free) TP316H material exhibited a notable hydrogen toughening effect after hydrogen charging, which has been attributed to the hydrogen-enhanced twinning-induced plasticity (TWIP) deformation mechanism of the austenitic solid solution. In contrast, both aging expositions resulted in significantly lowered hydrogen embrittlement resistance, which was likely caused by hydrogen trapping effects at the precipitate/matrix interfaces in thermally aged materials, leading to a reduced TWIP effect in the austenitic phase. Full article
(This article belongs to the Special Issue Fracture Behaviour of Structural Materials)
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16 pages, 10621 KiB  
Article
Experimental and Numerical Study on the Perforation Behavior of an Aluminum 6061-T6 Cylindrical Shell
by Seon-Woo Byun, Young-Jung Joo, Soo-Yong Lee and Sang-Woo Kim
Materials 2023, 16(21), 7055; https://doi.org/10.3390/ma16217055 - 6 Nov 2023
Viewed by 1445
Abstract
The modified Johnson–Cook (MJC) material model is widely used in simulation under high-velocity impact. There was a need to estimate a strain rate parameter for the application to the impact analysis, where the method typically used is the Split Hopkinson bar. However, this [...] Read more.
The modified Johnson–Cook (MJC) material model is widely used in simulation under high-velocity impact. There was a need to estimate a strain rate parameter for the application to the impact analysis, where the method typically used is the Split Hopkinson bar. However, this method had a limit to the experiment of strain rate. This study proposed to estimate the strain rate parameter of the MJC model based on the impact energy and obtained a parameter. The proposed method of strain rate parameter calculation uses strain parameters to estimate from the drop weight impact and high-velocity impact experiments. Then, the ballistic experiment and analysis were carried out with the target of the plate and cylindrical shape. These analysis results were then compared with those obtained from the experiment. The penetration velocities of plates could be predicted with an error of a maximum of approximately 3.7%. The penetration shape of the cylindrical target has a similar result shape according to impact velocity and had an error of approximately 6%. Full article
(This article belongs to the Special Issue Fracture Behaviour of Structural Materials)
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