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Delamination and Fracture Problems in Modern Engineering Materials
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Delamination and Fracture Problems in Modern Engineering Materials

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

Deadline for manuscript submissions: closed (30 December 2021) | Viewed by 6558

Special Issue Editor

Dr. Sylwester Samborski

E-Mail Website
Guest Editor
Associate Professor, Faculty of Mechanical Engineering, Lublin University of Technology, 36 Nadbystrzycka St., 20-618 Lublin, Poland
Interests: mechanics of materials; damage identification; fracture; delamination; acoustic emission; finite element method, machine technology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue covers the newest outcomes and trends in damage detection, identification and modeling in the case of modern engineering materials. The invitation to submit outstanding articles is addressed to a wide group of scientists and engineers working on new methods for material characterization for fracture toughness, damage evolution and damage tolerance—the factors having direct effects on the safety of the service of highly responsible structures.

The materials in focus are layered structures (FRPs, FMLs and sandwiches), particle-reinforced composites, smart materials (SMAs and PZTs), foams, ceramics, 3D printed materials and others. In consequence, both brittle and ductile fracture phenomena can be discussed, and both quasi-static and dynamic phenomena may be studied.

Any of the techniques for damage detection or identification in real time, such as wave propagation analysis (acoustic emission and Lamb waves) are in the area of interest. On the other hand, there are many post-failure exploration techniques—fractography, tomography and ultrasonics—helpful for the efficient identification of various types of defects and inference of damage evolution. All these approaches are welcome in this Special Issue as potentially advantageous in the process of engineering materials’ development and able to induce progress in the field of damage mechanics.

Last but not least, an aspect of the aforementioned problems is advancement in modeling techniques, usually implemented in the Finite Element codes and useful in the evaluation of strength, stability and failure criteria—prior to physical experiments. The progress in numerical methods is very important in the further expansion of modern engineering materials.

Assoc. Prof. Sylwester Samborski
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 100 words) can be sent to the Editorial Office for announcement on this website.

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

  • Delamination
  • Fracture toughness
  • Health monitoring
  • Damage tolerance
  • Damage evolution
  • Elastic wave propagation
  • Acoustic emission
  • Finite element modeling

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Published Papers (2 papers)

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Research

13 pages, 7006 KiB  
Article
Effect of Delamination and Grain Refinement on Fracture Energy of Ultrafine-Grained Steel Determined Using an Instrumented Charpy Impact Test
by Tadanobu Inoue and Yuuji Kimura
Materials 2022, 15(3), 867; https://doi.org/10.3390/ma15030867 - 24 Jan 2022
Cited by 12 | Viewed by 3331
Abstract
Improving the balance of strength and toughness in structural materials is an ongoing challenge. Delamination and grain refinement are some of the methods used to do this. In this paper, two different steels, 0.15% C–0.3% Si–1.5% Mn–Fe and 0.4% C–2% Si–1% Cr–1% Mo–Fe [...] Read more.
Improving the balance of strength and toughness in structural materials is an ongoing challenge. Delamination and grain refinement are some of the methods used to do this. In this paper, two different steels, 0.15% C–0.3% Si–1.5% Mn–Fe and 0.4% C–2% Si–1% Cr–1% Mo–Fe (mass %), were prepared. Two steel bars with an ultrafine elongated grain (UFEG) structure were fabricated via multipass warm caliber rolling. The UFEG steels were characterized by a strong <110>//rolling-direction fiber texture. The transverse grain size, dt, was 1.0 µm for the low-carbon steel and 0.26 µm for the medium-carbon steel. For comparison, conventional heat-treated steels were also fabricated. An instrumented Charpy impact test was performed, and the impact load (P) and deflection (u) during the test were recorded. The P–u relations at the test temperature at which delamination fracture occurred exhibited a unique curve. Delamination effectively enhances the low-temperature toughness, and this was characterized by a plateau region of constant load in the P–u curve. Assuming no delamination, two routes in the P–u curves, the ductile route and the brittle route, were proposed. The results showed that the proposed methods can be predicted by an energy curve for ultrafine grained steels. Delamination is a more effective method of enhancing toughness for ultra-high-strength steels. Full article
(This article belongs to the Special Issue Delamination and Fracture Problems in Modern Engineering Materials)
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22 pages, 9027 KiB  
Article
Experimental Investigation on the Low Velocity Impact Response of Fibre Foam Metal Laminates
by Patryk Jakubczak, Magda Droździel, Piotr Podolak and Jesus Pernas-Sánchez
Materials 2021, 14(19), 5510; https://doi.org/10.3390/ma14195510 - 23 Sep 2021
Cited by 4 | Viewed by 2311
Abstract
The combination of fibre metal laminates (FML) and sandwich structures can significantly increase the performance under impact of FMLs. The goal of this work was to create a material that will combine the superior properties of FMLs and foam sandwich structures in terms [...] Read more.
The combination of fibre metal laminates (FML) and sandwich structures can significantly increase the performance under impact of FMLs. The goal of this work was to create a material that will combine the superior properties of FMLs and foam sandwich structures in terms of the impact resistance and simultaneously have lower density and fewer disadvantages related to the manufacturing. An extensive impact testing campaign has been done using conventional fibre metal laminates (carbon- and glass-based) and in the proposed fibre foam metal laminates to assess and compare their behaviour. The main difference was observed in the energy absorption mechanisms. The dominant failure mechanism for fibre foam laminates is the formation of delaminations and matrix cracks while in the conventional fibre metal laminate the main failure mode is fibre cracking due to high local stress concentrations. The reduction in the fibre cracking leads to a better after-impact resistance of this type of structure improving the safety of the structures manufactured with these materials. Full article
(This article belongs to the Special Issue Delamination and Fracture Problems in Modern Engineering Materials)
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