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Metals
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Fatigue Crack Propagation Micromechanisms of Metallic Materials
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Fatigue Crack Propagation Micromechanisms of Metallic Materials

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Failure Analysis".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 9591

Special Issue Editor

Prof. Dr. Francesco Iacoviello

E-Mail Website
Guest Editor
Department of Civil and Mechanical Engineering, Universita di Cassino e del Lazio Meridionale, 03043 Cassino, Italy
Interests: fatigue crack propagation micromechanisms of stainless steels, ductile cast irons, Al and Ti alloys; hydrogen embrittlement of stainless steels
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since the dawn of the industrial revolution, fatigue has been among the most important and dangerous damaging mechanisms, responsible for crashes in transport (e.g., trains, ships, planes, cars), industry (e.g., pipes, vessels, valves), medical devices (e.g., prosthesis, stents), etc. The investigation on the damaging micromechanisms started with empirical macroscopical analyses of the fracture surfaces and today implies a multiscale approach starting from the nano-micro level, considering the atomic bonding breaking, up to the macroscopical behavior, with the failure analysis of the broken components.

This Special Issue focused on “Fatigue Crack Propagation Micromechanisms of Metallic Materials” aims to offer to the readers a synoptic view of the possible damaging mechanisms in metallic materials, considering the influence of all the possible aspects (e.g., alloys’ chemical composition and microstructures or environmental and loading conditions), and the possible different approaches to the topic (experimental, numerical, and/or analytical).

Topics addressed in this Special Issue may include but are not limited to:

  • Multiscale approach to fatigue crack initiation and propagation;
  • Fatigue damaging micromechanisms in different alloys;
  • Fatigue crack propagation and failure analysis;
  • Experimental and/or numerical techniques;
  • Environment and/or loading condition influence.

Prof. Dr. Francesco Iacoviello
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. Metals is an international peer-reviewed open access monthly 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

  • fatigue
  • crack propagation
  • crack initiation
  • metallic materials
  • failure analysis
  • micromechanims
  • loading condition
  • environment influence

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Published Papers (3 papers)

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Research

15 pages, 4819 KiB  
Article
Fatigue Tests on Buried or Repaired Dented Steel Pipeline Specimens
by Vitor Paiva, Giancarlo Gonzáles, Ronaldo Vieira, Alexandre Ribeiro, José Maneschy, Jorge Diniz, Ana D’Almeida and José Freire
Metals 2021, 11(12), 2031; https://doi.org/10.3390/met11122031 - 14 Dec 2021
Cited by 2 | Viewed by 2675
Abstract
This paper presents the results of fatigue tests performed on dented steel pipeline specimens that were tested under different environmental conditions and subjected to cyclic internal pressure. Thirty-three pipe specimens were divided into three groups and tested under three different conditions. A first [...] Read more.
This paper presents the results of fatigue tests performed on dented steel pipeline specimens that were tested under different environmental conditions and subjected to cyclic internal pressure. Thirty-three pipe specimens were divided into three groups and tested under three different conditions. A first set of nine dented specimens was tested in air without any restrictions. A second set of eight specimens was tested while buried in the soil. A third set of sixteen specimens was tested in air, after the dents had been repaired by composite material sleeves. Hot-spot cyclic strain amplitudes were measured using two experimental techniques: Digital Image Correlation (DIC) and Fiber Optic Bragg Strain Gauges (FBSG). At first, all thirty-three specimens were tested in air along five full cycles in order to carry out full-field measurements using DIC to identify and quantify strain concentration at sites that were potential locations for fatigue cracks to initiate. Close to these point-locations, measurements of strains using FBSG were also made, and the results were then compared with the DIC results. FBSG were also used during the cyclic pressure loading process while the specimens were being tested, in such a way as to monitor the influence of the environment in the dented areas. The test results demonstrated that a simple uniaxial Manson-Coffin fatigue equation that uses the universal exponents proposed by Manson, together with the circumferential strain amplitude measured at the hot spots can be used to predict the fatigue life of the dented specimens. Moreover, it was determined that the measured strains at the hot-spot locations were not influenced by the soil coverage, although showing a considerable and beneficial decrease in their amplitudes caused by the composite repair reinforcements. Full article
(This article belongs to the Special Issue Fatigue Crack Propagation Micromechanisms of Metallic Materials)
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23 pages, 15716 KiB  
Article
Crack Growth Prediction on Critical Component for Structure Life Extension of Royal Malaysian Air Force (RMAF) Sukhoi Su-30MKM
by Arvinthan Venugopal, Roslina Mohammad, Md Fuad Shah Koslan, Ashaari Shafie, Alizarin bin Ali and Owi Eugene
Metals 2021, 11(9), 1453; https://doi.org/10.3390/met11091453 - 14 Sep 2021
Cited by 7 | Viewed by 3082
Abstract
The critical aircraft structure, being the load-bearing members, is a vital component for any aircraft. The effect of fatigue loading, operating conditions, and environmental degradation has caused the structural integrity of the airframe to be assessed for its airworthiness requirement. Using the fatigue [...] Read more.
The critical aircraft structure, being the load-bearing members, is a vital component for any aircraft. The effect of fatigue loading, operating conditions, and environmental degradation has caused the structural integrity of the airframe to be assessed for its airworthiness requirement. Using the fatigue design concept of Safe Life, the RMAF adopts the Aircraft Structure Integrity Program (ASIP) to monitor the structural integrity of its critical components. RMAF has produced the task card using the engineering analysis concept on the aircraft’s critical structure. Various Computer-Aided Engineering (CAE) methods were used, and for this analysis, the Crack Growth Prediction method was used to determine the crack growth behavior and its ultimate failure point in case of any crack occurrences. Although there are six critical locations, the wing root is chosen since it has the highest possibility of fatigue failure. The analytical methods which were discussed are Crack Growth Analysis and Low Cycle Fatigue. For the numerical method, NX Nastran was used for the simulation of crack growth. The result from the crack growth analysis was validated with the numerical result. The conclusion is that, based on the fatigue life cycle, the wing root structure condition is not affected by severe damage, and its failure is approximately around 30 to 100 years for both the through hole and through side crack. Thus, its structural life can be extended. The research outcome will be on the extension of the structure life of the aircraft wing. Full article
(This article belongs to the Special Issue Fatigue Crack Propagation Micromechanisms of Metallic Materials)
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21 pages, 36237 KiB  
Article
Study on the Influence of the Gurson–Tvergaard–Needleman Damage Model on the Fatigue Crack Growth Rate
by Edmundo R. Sérgio, Fernando V. Antunes, Diogo M. Neto and Micael F. Borges
Metals 2021, 11(8), 1183; https://doi.org/10.3390/met11081183 - 25 Jul 2021
Cited by 3 | Viewed by 2348
Abstract
The fatigue crack growth (FCG) process is usually accessed through the stress intensity factor range, ΔK, which has some limitations. The cumulative plastic strain at the crack tip has provided results in good agreement with the experimental observations. Also, it allows [...] Read more.
The fatigue crack growth (FCG) process is usually accessed through the stress intensity factor range, ΔK, which has some limitations. The cumulative plastic strain at the crack tip has provided results in good agreement with the experimental observations. Also, it allows understanding the crack tip phenomena leading to FCG. Plastic deformation inevitably leads to micro-porosity occurrence and damage accumulation, which can be evaluated with a damage model, such as Gurson–Tvergaard–Needleman (GTN). This study aims to access the influence of the GTN parameters, related to growth and nucleation of micro-voids, on the predicted crack growth rate. The results show the connection between the porosity values and the crack closure level. Although the effect of the porosity on the plastic strain, the predicted effect of the initial porosity on the predicted crack growth rate is small. The sensitivity analysis identified the nucleation amplitude and Tvergaard’s loss of strength parameter as the main factors, whose variation leads to larger changes in the crack growth rate. Full article
(This article belongs to the Special Issue Fatigue Crack Propagation Micromechanisms of Metallic Materials)
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