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Creep Behaviour and Life Assessment of Structural Materials

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

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 2897

Special Issue Editors


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Guest Editor
Department of Chemical, Materials and Production Engineering, University of Napoli Federico II, Naples, Italy
Interests: creep modelling; creep damage; ductile damage; brittle fructure; fatigue failure; stress analysis; strenght of composite structures; fracture mechanics; biomechanics

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Guest Editor
Department of Chemical, Materials and Production Engineering, University of Napoli Federico II, Napoli, Italy
Interests: experimental mechanics; finite element method; creep; biomechanics; fracture mechanics; damage mechanics; thermomechanical fatigue; composite materials; stress analysis; bonded joints
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Special Issue Information

Dear Collegues,

Several processes require the increase of operating temperature to ensure higher efficiency. Elevated temperatures can speed up the processes of creep strain accumulation and activate mechanisms of damage that can cause early failure of the material. Other no less important applications are governed by stress relaxation, which is closely related to the viscous flow of the material. One of the critical issues in the creep design is the life assessment of structural materials linked to the capability to predict the creep behaviour in operation. A further limitation is the limited availability of long-term experimental data so that creep theories are often validated on short-term tests. In this context, further studies on new more performing materials as well as on advanced creep modelling can help to preserve an adequate level of structural integrity. The topic and its potential applications, although of extreme relevance, cover little space in the scientific literature. It is our pleasure to invite you to submit a manuscript for this Special Issue entitled “Creep Behaviour and Life Assessment of Structural Materials.”

This Special Issue is dedicated to publishing papers in all fields related to creep behaviour of structural materials that address recent advances in the research and development of the materials. Results of theoretical, analytical, numerical, or experimental investigation can be presented. Review articles can be also proposed.

Dr. Luca Esposito
Dr. Michele Perrella
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

  • creep life assessment
  • creep data analisys
  • creep modelling
  • material creep mechanics
  • creep experiments
  • New creep experimental tecniques
  • finite element method
  • creep fatigue
  • creep damage
  • bonded joints
  • rheological model
  • creep relaxation

Published Papers (2 papers)

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Research

12 pages, 2577 KiB  
Article
Stress Relaxation Behavior of Additively Manufactured Polylactic Acid (PLA)
by Alcide Bertocco, Matteo Bruno, Enrico Armentani, Luca Esposito and Michele Perrella
Materials 2022, 15(10), 3509; https://doi.org/10.3390/ma15103509 - 13 May 2022
Cited by 3 | Viewed by 1575
Abstract
In this work, the stress relaxation behavior of 3D printed PLA was experimentally investigated and analytically modeled. First, a quasi-static tensile characterization of additively manufactured samples was conducted by considering the effect of printing parameters like the material infill orientation and the outer [...] Read more.
In this work, the stress relaxation behavior of 3D printed PLA was experimentally investigated and analytically modeled. First, a quasi-static tensile characterization of additively manufactured samples was conducted by considering the effect of printing parameters like the material infill orientation and the outer wall presence. The effect of two thermal conditioning treatments on the material tensile properties was also investigated. Successively, stress relaxation tests were conducted, on both treated and unconditioned specimens, undergoing three different strains levels. Analytical predictive models of the viscous behavior of additive manufactured material were compared, highlighting and discussing the effects of considered printing parameters. Full article
(This article belongs to the Special Issue Creep Behaviour and Life Assessment of Structural Materials)
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15 pages, 4599 KiB  
Article
Cavity Nucleation and Growth in Nickel-Based Alloys during Creep
by Felix Meixner, Mohammad Reza Ahmadi and Christof Sommitsch
Materials 2022, 15(4), 1495; https://doi.org/10.3390/ma15041495 - 17 Feb 2022
Cited by 2 | Viewed by 1638
Abstract
The number of fossil fueled power plants in electricity generation is still rising, making improvements to their efficiency essential. The development of new materials to withstand the higher service temperatures and pressures of newer, more efficient power plants is greatly aided by physics-based [...] Read more.
The number of fossil fueled power plants in electricity generation is still rising, making improvements to their efficiency essential. The development of new materials to withstand the higher service temperatures and pressures of newer, more efficient power plants is greatly aided by physics-based models, which can simulate the microstructural processes leading to their eventual failure. In this work, such a model is developed from classical nucleation theory and diffusion driven growth from vacancy condensation. This model predicts the shape and distribution of cavities which nucleate almost exclusively at grain boundaries during high temperature creep. Cavity radii, number density and phase fraction are validated quantitively against specimens of nickel-based alloys (617 and 625) tested at 700 °C and stresses between 160 and 185 MPa. The model’s results agree well with the experimental results. However, they fail to represent the complex interlinking of cavities which occurs in tertiary creep. Full article
(This article belongs to the Special Issue Creep Behaviour and Life Assessment of Structural Materials)
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