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Special Issue "Focus on Fatigue and Fracture of Engineering Materials, Volume II"

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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: 29 February 2024 | Viewed by 3851

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Special Issue Editors

Prof. Dr. Joel De Jesus

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Guest Editor

Department of Mechanical Engineering, University of Coimbra, 3030788 Coimbra, Portugal
Interests: fatigue; fatigue crack growth; low cycle fatigue; mechanical properties; welding; friction stir processing; friction stir welding; additive manufacturing; failure analysis; mechanical design; corrosion fatigue; fracture
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Dr. Ricardo Branco

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Guest Editor

Department of Mechanical Engineering, CEMMPRE, University of Coimbra, 3030-788 Coimbra, Portugal
Interests: fatigue behaviour; additive manufacturing; multiaxial fatigue; damage accumulation
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Dr. Diogo Neto

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Guest Editor

Department of Mechanical Engineering, University of Coimbra, 3004-531 Coimbra, Portugal
Interests: computational mechanics; non-linear solid mechanics; elastoplastic behavior of materials; thermomechanical analysis; additive manufacturing; fatigue crack growth
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Special Issue Information

Dear Colleagues,

Considering that fatigue and fracture phenomena are responsible for 80% to 90% of failures in mechanical components, it is essential to study these phenomena to guarantee long-term durability and reliability. The introduction of new materials and new manufacturing processes brings new challenges to design and requires more focused research. This Special Issue aims to be a forum for the analysis of new trends in fracture mechanics and fatigue design in all materials, with special attention to new materials and new production processes as well as new failure models and new design criteria. Papers dealing with the effects of processing techniques, microstructure features, loading history, the environmental medium, and the modeling of mechanical behavior, as well as papers dealing with advanced applications, are encouraged. Both experimental and numerical approaches will be accepted. The Special Issue is open to both original research and review articles.

Prof. Dr. Joel De Jesus
Dr. Ricardo Branco
Dr. Diogo Neto
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. Applied Sciences 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 2300 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

fatigue
fracture
fatigue crack growth
corrosion fatigue
low cycle fatigue
high cycle fatigue
numerical fatigue analysis
fatigue crack initiation
variable amplitude fatigue
fatigue damage accumulation
failure analysis
stress-based, strain-based, and energy-based criteria
linear elastic fracture mechanics
elasto-plastic fracture mechanics
computational fracture mechanics

Published Papers (5 papers)

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Research

16 pages, 5548 KiB

Open AccessArticle

Fatigue Crack Growth Studies under Mixed-Mode Loading in AISI 316 Stainless Steel

Abdulnaser M. Alshoaibi

and

Abdullateef H. Bashiri

Appl. Sci. 2023, 13(16), 9446; https://doi.org/10.3390/app13169446 - 21 Aug 2023

Viewed by 628

Abstract

The objective of this study is to examine the behavior of fatigue crack growth (FCG) in the mixed mode (I/II) of the AISI 316 austenitic stainless steel alloy, considering mode mixity angles of 30°, 45°, and 60°. This particular alloy is widely used in the marine industry and various structural components because of its exceptional properties, such as high corrosion resistance, good formability, weldability, and high-temperature strength. By investigating the crack growth behavior, the study seeks to provide insights into the material’s durability and potential for long-term use in demanding applications. To analyze fatigue crack growth behavior using linear elastic fracture mechanics (LEFM), this study utilizes compact tension shear (CTS) specimens with varying loading angles. The CTS specimens provide an accurate simulation of real-world loading conditions by allowing for the application of various loading configurations, resulting in mixed-mode loading. The ANSYS Mechanical APDL 19.2 software, which includes advanced features such as separating, morphing, and adaptive remeshing technologies (SMART), was utilized in this study to precisely model the path of crack propagation, evaluate the associated fatigue life, and determine stress intensity factors. Through comparison with experimental data, it was confirmed that the loading angle had a significant impact on both the fatigue crack growth paths and the fatigue life cycles. The stress-intensity factor predictions from numerical models were compared to analytical data. Interestingly, it was observed that the maximum shear stress and von Mises stresses occurred when the loading angle was 45 degrees, which is considered a pure shear loading condition. The comparison shows consistent results, indicating that the simulation accurately captures the behavior of the AISI 316 austenitic stainless steel alloy under mixed-mode loading conditions. Full article

(This article belongs to the Special Issue Focus on Fatigue and Fracture of Engineering Materials, Volume II)

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13 pages, 2698 KiB

Open AccessArticle

A Method for Plotting Failure Envelopes of Unidirectional Polymer Composite Materials under Different Strain Rates

and

Appl. Sci. 2023, 13(16), 9214; https://doi.org/10.3390/app13169214 - 13 Aug 2023

Viewed by 682

Abstract

This article emphasizes the significance of investigating the nonlinear behavior and strength characteristics of polymer composite materials under various strain rates. The study utilizes test results of a unidirectional (UD) composite material subjected to compression at different angles relative to the reinforcement direction, using quasi-static, static, and dynamic strain rates. The analysis focused on a UD layer experiencing compressive stresses perpendicular to the fiber reinforcement and in-plane shear stresses. A novel model is presented, enabling the calculation and prediction of the strength of a UD composite under uniaxial loading at different angles to the fiber direction, considering various strain rates. The developed model facilitates the derivation of equations for the failure envelopes of UD Carbon Fiber-Reinforced Polymers (CFRPs) under quasi-static, static, and dynamic loading conditions. To construct the failure envelopes of CFRPs, it is necessary to acquire experimentally determined values of tensile and compressive strength in the direction perpendicular to the reinforcement, as well as the ultimate strength in uniaxial compression of a specimen with reinforcement at a 45° angle to the loading axis. The failure envelopes generated using the proposed model exhibit excellent agreement with experimental data, with coefficients of determination ranging from 0.864 to 0.957, depending on the deformation rate. Consequently, the developed model holds promise for predicting the strength of other UD polymer composite materials. Full article

(This article belongs to the Special Issue Focus on Fatigue and Fracture of Engineering Materials, Volume II)

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19 pages, 12381 KiB

Open AccessArticle

Experimental Study of the Fatigue Life of Off-Highway Steel Wheels Using the Rim Section Test Approach

Luigi Solazzi

and

Alberto Mazzoni

Appl. Sci. 2023, 13(16), 9119; https://doi.org/10.3390/app13169119 - 10 Aug 2023

Viewed by 676

Abstract

Wheels are structural components designed to sustain dynamic loads and avoid fatigue failures in service. For their validation, when standard fatigue tests are not feasible due to premature tyre wear, alternative methods should be used. In this paper, the rim section test approach is evaluated for the fatigue life assessment of steel rims for off-highway wheels. Customized specimens were studied by finite element analysis and subjected to bending fatigue tests to obtain the fatigue curve for the critical point of the rim. The results were also compared to fatigue data from standard tests of the base material, confirming the importance of testing components in conditions as similar as possible to the final ones in service. Additional measurements of the specimens’ surface hardness showed how this approach is valid to consider the effects of possible work hardening induced in the components by the production process. The residual stress state, instead, does not seem to be considered appropriately, since the initial compressive residual stresses of the component were released during the manufacturing of the specimens. The overall results of the study confirmed the suitability of the section test approach as an alternative method for the fatigue life evaluation of structural components. Moreover, it could be used for specific investigations concerning the influence of the production process parameters on wheel rims. Full article

(This article belongs to the Special Issue Focus on Fatigue and Fracture of Engineering Materials, Volume II)

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20 pages, 4039 KiB

Open AccessArticle

Resonant Fatigue Tests on Drill Pipe Connections with Different Geometries and Sizes

Ciro Santus

Lorenzo Romanelli

Alessandro Burchianti

and

Tomoya Inoue

Appl. Sci. 2023, 13(14), 8006; https://doi.org/10.3390/app13148006 - 08 Jul 2023

Viewed by 735

Abstract

In this study, a resonant bending fatigue test rig, designed and implemented by the University of Pisa, is presented, providing a detailed description of the set-up of the machine, the strain gauges calibrations, and the control system used with the main electronic devices. Several geometries of drill pipe connections and pipe samples made of different materials were tested, and all the obtained experimental fatigue results are presented in the paper and compared to previous experimental data. Fractographic images are provided to clearly show that, in two kinds of drill pipe connections, the crack initiation was found at the connection zone, whereas for another connection geometry, it was found at the pipe body. In order to interpret these latter results, a discussion about the section modulus of bending of the various sections of the drill pipes was provided, along with an FE model of a specific zone of one of these connections. Full article

(This article belongs to the Special Issue Focus on Fatigue and Fracture of Engineering Materials, Volume II)

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14 pages, 2384 KiB

Open AccessArticle

Experimental and Numerical Investigation of the Mesoscale Size Effect in Notched Woven Composites

Andrea Ferrarese

Carlo Boursier Niutta

and

Appl. Sci. 2023, 13(7), 4300; https://doi.org/10.3390/app13074300 - 28 Mar 2023

Viewed by 754

Abstract

The uniaxial strength of 2 × 2 twill carbon fiber-epoxy composite with circular open holes is governed by the stress concentration induced by the notch, as well as by the variation of the material response with the stress localization. In this study, these concurrent phenomena were studied using an experimental-numerical approach, considering the effect of the composite heterogeneity. An innovative simplified mesoscale model using shell elements to replicate the woven pattern was developed. The material properties of the model were identified with a data-driven optimization scheme that minimizes the difference between the experimental full-field strain, measured with Digital Image Correlation, and the one predicted by the model itself. The elastic properties identified for the material at tow level are analogous to that of a unidirectional composite, with longitudinal and transverse moduli of around 102 GPa and 15 GPa, respectively. The calibrated model was used to analyze the stress concentration and localization induced by circular notches with increasing diameter. A size effect describing the increase in the carbon fiber tow strength following the increase in stress localization was observed. The mesoscale material strength was found to increase by about 2.5 times in the presence of the notch, from 2131 to 3922 MPa in fiber direction, partially balancing the stress intensification effect of the hole that leads to an approximately three-fold stress increase in the material. Full article

(This article belongs to the Special Issue Focus on Fatigue and Fracture of Engineering Materials, Volume II)

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Special Issue "Focus on Fatigue and Fracture of Engineering Materials, Volume II"

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