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Tackling Materials Failure: Scale Bridging for Structural Integrity

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

Deadline for manuscript submissions: closed (20 June 2023) | Viewed by 2661

Special Issue Editors

Faculty of Mechanical Engineering, OTH Regensburg, Galgenbergstr. 30, 93053 Regensburg, Germany
Interests: multiscale materials modeling; fracture mechanics; damage mechanics; fluid–structure–interaction modeling; biomechanics; machine learning
Special Issues, Collections and Topics in MDPI journals
Department of Civil & Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
Interests: computational mechanics; hydrodynamics; finite element analysis; biomechanics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

As the Second Law of Thermodynamics suggests, failure is an intrinsic characteristic of any materials system. Given its prevalence, one would assume that assessing a materials system’s capability to endure is relatively straightforward; however, this is not the case. The proverbial butterfly effect is an appropriate moniker for failure as delicate and pernicious events rooted in the lower-length scales can evolve almost unpredictably to severely compromise the structural integrity of a materials system. For example, in metallic systems, seemingly innocuous dislocations at the atomic scale can evolve into life-limiting cracks in a myriad of ways. Some dislocations might nucleate microcracks whose stress intensities are amplified by micron-sized voids, thereby facilitating ductile crack propagation. Others might initiate microcracks that evolve synergistically with oxidation, creep, and/or fatigue loading. In organic materials systems, physiological processes, such as the up-regulation of proteins (e.g., in cell membrane repair), can act to strengthen or even heal the system, making the question of failure both stochastic and highly non-linear.

This Special Issue is intended to give material scientists, experimentalists, computational mechanicians, biochemists, applied mathematicians, and stakeholders, such as fleet managers, a platform to disseminate their novel work at the intersection of fundamental failure-related science and more practical life-ing technologies. Materials systems of interest include, e.g., metals and their alloys, metallic glasses, metal matrix composites, functionally graded materials, ceramics and ceramic composites, and organic materials, such as biofilms and bone. This breadth of systems is meant localize competencies from different fields that typically do not overlap with one another, thereby presenting opportunities for cross-cutting innovation. Work in experimental methods development (e.g., in situ fracture tests, tests for mixed-mode fracture, novel approach for uncertainty propagation while forecasting life) and computational analysis (e.g., finite element framework bridging scales, application of damage mechanics or geometrically explicit crack growth, cumulative damage modeling) is requested.

Prof. Dr. Aida Nonn
Dr. Albert Cerrone
Guest Editors

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

  • fracture mechanics
  • damage mechanics
  • crystal plasticity
  • complex loading conditions, e.g., multiaxial, dynamic, fatigue
  • creep-fatigue interaction
  • environmental conditions, e.g., oxidation, hydrogen embrittlement, extreme
  • additive manufacturing
  • materials testing
  • stochastics
  • machine learning methods

Published Papers (2 papers)

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Research

19 pages, 5724 KiB  
Article
Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model
by Robin Depraetere, Wim De Waele, Margo Cauwels, Tom Depover, Kim Verbeken and Stijn Hertelé
Materials 2023, 16(13), 4839; https://doi.org/10.3390/ma16134839 - 05 Jul 2023
Cited by 2 | Viewed by 1108
Abstract
Hydrogen can degrade the mechanical properties of steel components, which is commonly referred to as “hydrogen embrittlement” (HE). Quantifying the effect of HE on the structural integrity of components and structures remains challenging. The authors investigated an X70 pipeline steel through uncharged and [...] Read more.
Hydrogen can degrade the mechanical properties of steel components, which is commonly referred to as “hydrogen embrittlement” (HE). Quantifying the effect of HE on the structural integrity of components and structures remains challenging. The authors investigated an X70 pipeline steel through uncharged and hydrogen-charged (notched) tensile tests. This paper presents a combination of experimental results and numerical simulations using a micro-mechanics-inspired damage model. Four specimen geometries and three hydrogen concentrations (including uncharged) were targeted, which allowed for the construction of a fracture locus that depended on the stress triaxiality and hydrogen concentration. The multi-physical finite element model includes hydrogen diffusion and damage on the basis of the complete Gurson model. Hydrogen-Assisted degradation was implemented through an acceleration of the void nucleation process, as supported by experimental observations. The damage parameters were determined through inverse analysis, and the numerical results were in good agreement with the experimental data. The presented model couples micro-mechanical with macro-mechanical results and makes it possible to evaluate the damage evolution during hydrogen-charged mechanical tests. In particular, the well-known ductility loss due to hydrogen was captured well in the form of embrittlement indices for the different geometries and hydrogen concentrations. The limitations of the damage model regarding the stress state are discussed in this paper. Full article
(This article belongs to the Special Issue Tackling Materials Failure: Scale Bridging for Structural Integrity)
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11 pages, 5016 KiB  
Communication
Microstructural Degradation and Creep Property Damage of a Second-Generation Single Crystal Superalloy Caused by High Temperature Overheating
by Xiaotong Guo, Hao He, Fangzhou Chen, Jiahao Liu, Wendao Li and Hao Zhao
Materials 2023, 16(4), 1682; https://doi.org/10.3390/ma16041682 - 17 Feb 2023
Cited by 2 | Viewed by 1097
Abstract
Nickel base superalloys are widely used to manufacture turbine blades, and overheating poses a serious threat to the safe service of turbine blades. In this study, a second-generation nickel base single crystal superalloy was taken as the research object, and we carried out [...] Read more.
Nickel base superalloys are widely used to manufacture turbine blades, and overheating poses a serious threat to the safe service of turbine blades. In this study, a second-generation nickel base single crystal superalloy was taken as the research object, and we carried out the overheating treatment at 1100 °C and 1300 °C, and then tested the creep properties at 1000 °C/300 MPa and 1100 °C/130 MPa. Through systematic analysis of creep properties, γ/γ’ phases, and creep voids, the effects of overheating on the microstructures and creep properties of the experimental superalloy were revealed. The results demonstrate that the effect of overheating at 1100 °C on the microstructure of the experimental superalloy can be ignored, and the effect on the creep property is limited. The degree of γ’ dissolution is gradually increased and the creep property is reduced with overheating time extending at the overheating temperature of 1300 °C. Full article
(This article belongs to the Special Issue Tackling Materials Failure: Scale Bridging for Structural Integrity)
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