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Applied Sciences
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Fatigue Strength of Machines and Systems
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Fatigue Strength of Machines and Systems

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

Deadline for manuscript submissions: 10 November 2024 | Viewed by 3236

Special Issue Editors

Dr. Przemysław Strzelecki

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Bydgoszcz University of Science and Technology, Bydgoszcz, Poland
Interests: fatigue; S-N curve; analytical methods; Weibull distribution; fatigue reliability
Dr. Michał Stopel

E-Mail Website
Guest Editor
Faculty of Life Sciences, Bydgoszcz University of Technology and Life Sciences, Bydgoszcz, Poland
Interests: numerical methods in mechanical engineering; finite element method; dynamic loads; crash tests; road safety; unmanned aerial systems
Dr. Maciej Kotyk

E-Mail Website
Guest Editor
Faculty of Life Sciences, Bydgoszcz University of Technology and Life Sciences, Bydgoszcz, Poland
Interests: fracture mechanics; experimental analysis; reduced temperatures

Special Issue Information

Dear Colleagues,

The fatigue properties were investigated since XIX ages. Many researchers, from that time up today, tested and developed theories about it, but still occurs catastrophes caused by fatigue crack. To prevent fatigue crack different models are used. To use any of them it must be known the fatigue properties of the material, which will be used. These properties are specified by various constants. Many models have been developed to estimate the material’s constants from tensile tests or hardness measures. But these methods can lead to a large error. Especially, this could be happened for new material or using new heat treatment or plastic deformation. That is why it is important to correlate the fatigue properties of metal with elements of machine or system.

We invite researchers to contribute to the Special Issue on Fatigue Strength of Machines and Systems, which is intended to present structure, mechanical and fatigue or fracture properties of materials of structure.

Dr. Przemysław Strzelecki
Dr. Michał Stopel
Dr. Maciej Kotyk
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 2400 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
  • damage mechanics
  • short and long crack growth
  • structural integrity
  • crystal structure
  • fractography
  • heat treatment
  • plastic deformation
  • failure analysis

Published Papers (5 papers)

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Research

25 pages, 13244 KiB  
Article
Upgrade of the Universal Testing Machine for the Possibilities of Fatigue Tests in a Limited Mode
by Róbert Huňady, Peter Sivák, Ingrid Delyová, Jozef Bocko, Ján Vavro, Jr. and Darina Hroncová
Appl. Sci. 2024, 14(10), 3973; https://doi.org/10.3390/app14103973 - 7 May 2024
Viewed by 383
Abstract
The object of the upgrade presented in this paper was an older analogue-based universal testing machine preferably designed for tensile testing. The objective of the upgrade was to create a new digitized measurement chain capable of also operating in the mode of simple [...] Read more.
The object of the upgrade presented in this paper was an older analogue-based universal testing machine preferably designed for tensile testing. The objective of the upgrade was to create a new digitized measurement chain capable of also operating in the mode of simple fatigue tests with cyclic tensile stresses. The upgrade of the equipment mainly included the processes of calibration, creation of related calibration jigs, creation of transformation dependencies and digitization, creation or completion of missing parts of chain-signal conditioning modules, A/D converters, special jigs, etc., as elements of the experimental hardware. The degree of correctness of the calibration and of the transformation dependencies created was verified by regression analysis, and this was verified by simple correlation analysis. The correctness of the proposed modifications, was verified on the basis of the fatigue tests performed for cyclic loading. Thus, it was possible to design, develop and functionally verify a new measurement chain based on an older universal testing machine. Thus, a partially digitized pulsator was created for the possibility of fatigue testing in a technically or functionally limited mode, mainly for educational purposes as a temporary replacement for the order of magnitude more expensive commercially produced test systems. Full article
(This article belongs to the Special Issue Fatigue Strength of Machines and Systems)
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17 pages, 5590 KiB  
Article
Unconventional Wells Interference: Supervised Machine Learning for Detecting Fracture Hits
by Guoxiang Liu, Xiongjun Wu and Vyacheslav Romanov
Appl. Sci. 2024, 14(7), 2927; https://doi.org/10.3390/app14072927 - 30 Mar 2024
Viewed by 636
Abstract
The primary objective of the study was development of a machine learning (ML)-based workflow for fracture hit (“frac hit”) detection and monitoring using shale oil-field data such as drilling surveys, production history (oil and produced water), pressure, and fracking start time and duration [...] Read more.
The primary objective of the study was development of a machine learning (ML)-based workflow for fracture hit (“frac hit”) detection and monitoring using shale oil-field data such as drilling surveys, production history (oil and produced water), pressure, and fracking start time and duration records. The ML method takes advantage of long short-term memory (LSTM) and multilayer perceptron (MLP) neural networks to identify the frac hits due to hydraulic communication between the fracking child well(s) and the producing parent well(s) within the same pad (intra-pad interaction) and/or on different pads (inter-pad interaction). It utilizes time series of pressure and production data from within a pad and from adjacent pads. The workflow can capture time variable features of frac hits when the model architecture is deep and wide enough, with enough trainable parameters for deep learning and feature extraction, as demonstrated in this paper by using training and testing subsets of the field data from selected neighboring pads with over a couple of hundred wells. The study was focused on frac-hit interaction among paired wells and demonstrated that the ML model, once trained, can predict the frac-hit probability. Full article
(This article belongs to the Special Issue Fatigue Strength of Machines and Systems)
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13 pages, 2867 KiB  
Article
Determination of the Statistical Power of Fatigue Characteristics in Relation to the Number of Samples
by Przemysław Strzelecki and Janusz Sempruch
Appl. Sci. 2024, 14(6), 2440; https://doi.org/10.3390/app14062440 - 14 Mar 2024
Viewed by 551
Abstract
The paper presents guidelines included in the ISO 12107:2003 standard regarding the number of samples for determining the fatigue characteristics in the high cycle range. The proposed normative values were compared with the classical statistical approach. Fatigue test results for S355J2+C steel for [...] Read more.
The paper presents guidelines included in the ISO 12107:2003 standard regarding the number of samples for determining the fatigue characteristics in the high cycle range. The proposed normative values were compared with the classical statistical approach. Fatigue test results for S355J2+C steel for rotary bending were used for verification. In addition, the error and power of a statistical test were determined for characteristics with different sample sizes. It determined the number of specimens to estimate the fatigue curve, which required significant error and power of the statistical test. Full article
(This article belongs to the Special Issue Fatigue Strength of Machines and Systems)
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Graphical abstract

14 pages, 991 KiB  
Article
Study on Load Distribution and Fatigue Elastic Life of Ball Screw under Ultimate Conditions
by Lei Lv, Changhou Lu, Shujiang Chen and Weike Wang
Appl. Sci. 2024, 14(5), 1966; https://doi.org/10.3390/app14051966 - 28 Feb 2024
Viewed by 475
Abstract
When subjected to extreme loads and ultra-low cycling conditions, the primary mode of failure in a ball screw is that excessive plastic contact deformation of the raceway surface exceeds acceptable limits. Consequently, traditional fatigue life theories based on pitting fatigue are not applicable [...] Read more.
When subjected to extreme loads and ultra-low cycling conditions, the primary mode of failure in a ball screw is that excessive plastic contact deformation of the raceway surface exceeds acceptable limits. Consequently, traditional fatigue life theories based on pitting fatigue are not applicable in this context. This study evaluated the load distribution within the ball screw, considering factors such as the nut position and screw length. The plastic deformation of the raceway surfaces is analyzed using Thornton’s elastoplastic theory. Furthermore, this paper integrates the concepts of plastic deformation and fatigue elastic life to investigate the fatigue elastic life of ball screws under extreme conditions. To validate the proposed approach, the calculated results are compared with those from previous experimental studies, confirming its effectiveness. When the ratio of the nut position to the screw length approaches 0.7, the fatigue elastic life of the ball screw achieves its maximum. An increase in screw length, load, or raceway conformity ratio leads to a decrease in fatigue elastic life. Conversely, an increase in contact angle and ball diameter enhances the fatigue elastic life. Full article
(This article belongs to the Special Issue Fatigue Strength of Machines and Systems)
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20 pages, 9943 KiB  
Article
Study on the Residual Strength of Nonlinear Fatigue-Damaged Pipeline Structures
by Wenlan Wei, Rui Zhang, Yuwen Zhang, Jiarui Cheng, Yinping Cao and Fengying Fang
Appl. Sci. 2024, 14(2), 754; https://doi.org/10.3390/app14020754 - 16 Jan 2024
Viewed by 668
Abstract
The heat alternation and bending during the service process of the pipeline structure are the key issues affecting its residual strength. The nonuniform plastic deformation of its cross-section causes nonlinear damage to the structure, which makes it difficult to calculate the residual strength [...] Read more.
The heat alternation and bending during the service process of the pipeline structure are the key issues affecting its residual strength. The nonuniform plastic deformation of its cross-section causes nonlinear damage to the structure, which makes it difficult to calculate the residual strength of the overall structure. This study proposed a novel variable-strength material damage model with damage accumulation, which achieved the coupling analysis of structural damage and material fatigue residual strength, making the structural strength of nonlinear damage cross-section computable. Based on this, a theoretical ultimate load model for nonlinear damage cross-section and a finite element analysis model for dynamic material strength with damage accumulation were established. The analysis was conducted on the repeated banding damage to coiled tubing. The results showed that the residual yield strength of nonlinear damaged coiled tubing showed a trend of first rapid decrease and then slow decrease with damage accumulation, and the tensile displacement showed an increasing trend with damage accumulation. The ultimate internal pressure strength of nonlinear damaged structures showed a similar downward trend to the yield strength. The nonlinear damage coupling analysis model proposed in this study has significant practical engineering application value. Full article
(This article belongs to the Special Issue Fatigue Strength of Machines and Systems)
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