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Applied Sciences
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Ductile and Brittle Fractures in Metals
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Ductile and Brittle Fractures in Metals

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

Deadline for manuscript submissions: closed (20 August 2021) | Viewed by 13065

Special Issue Editor

Prof. Dr. Joonmo Choung

E-Mail Website
Guest Editor
Department of Naval Architecture and Ocean Engineering, Inha University, Incheon, Incheon, Korea
Interests: ductile fracture; plasticity; structural impact; material characterization

Special Issue Information

Dear Colleagues,

Engineering metals including high strength steels have been successfully applied in the automotive, oil and gas, construction and maritime industries due to their strength without compromising ductility. Ductile and brittle fractures in engineering metals causing premature failure of automobile parts in crashes or during assembly, and catastrophic failure of large scale engineering structures when subjected to extreme loads have recently become important research areas. The industry requires cheap and yet reliable experimental methods to characterize plasticity and ductile fractures. In addition, advanced computational modeling approaches are sorely needed at the design stage, as ductile and brittle fractures have become an important factor particularly limiting the design of automobiles. This Special Issue on “Ductile and Brittle Fractures in Metals” will consider a wide range of areas including, but not limited to, the following:

  • experimental characterization of ductile and brittle fracture behavior;
  • novel experimental techniques for plasticity and fracture characterization;
  • modeling of anisotropy of metal sheets;
  • multi-axial fracture;
  • strain rate and thermal effects on ductile and brittle fractures;
  • unit cell simulations;
  • coupled and uncoupled fracture models;
  • fracture prediction under complex loading histories;
  • ductile fracture prediction in sheet metal formation; and
  • ductile fracture prediction in crash analysis;

This Special Issue will provide a compilation of experimental and numerical studies related to “Ductile and Brittle Fractures in Metals” research.

Prof. Dr. Joonmo Choung
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. 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

  • ductile fracture
  • brittle fracture
  • engineering metals
  • plasticity
  • fracture prediction
  • shear fracture
  • damage mechanics
  • metal forming
  • structural impact and crashworthiness

Published Papers (4 papers)

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Research

11 pages, 3520 KiB  
Article
Piercing and Surface-Crack Defects in Cold Combined Forward-Backward Extrusion
by Heng-Sheng Lin, Chien-Yu Lee and Wen-Shun Li
Appl. Sci. 2021, 11(9), 3900; https://0-doi-org.brum.beds.ac.uk/10.3390/app11093900 - 26 Apr 2021
Viewed by 1887
Abstract
Metal flow tends to be complex and difficult to predict in the combined forward-backward extrusion (CFBE) process. Piercing and surface-crack defects are phenomenal in forming fasteners featuring a forward extruded pin and a backward extruded cup. In this work, a series of the [...] Read more.
Metal flow tends to be complex and difficult to predict in the combined forward-backward extrusion (CFBE) process. Piercing and surface-crack defects are phenomenal in forming fasteners featuring a forward extruded pin and a backward extruded cup. In this work, a series of the CFBE tests with various combinations of the forward extrusion ratio (FER) and the backward extrusion ratio (BER) were conducted. A forming limit diagram, detailed with the piercing and surface-crack defects on the forward extruded pin or the backward extruded cup, was developed to provide a conception in choosing appropriate extrusion ratios in forming fasteners with such pin-and-cup features. With the aid of the forming load-stroke curves and the finite element analysis of fracture damage, the fracturing mechanism for the CFBE process was provided. Full article
(This article belongs to the Special Issue Ductile and Brittle Fractures in Metals)
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16 pages, 5202 KiB  
Article
Localized Necking Model for Punching Fracture Simulation in Unstiffened and Stiffened Panels
by Sung-Ju Park and Kookhyun Kim
Appl. Sci. 2021, 11(9), 3774; https://0-doi-org.brum.beds.ac.uk/10.3390/app11093774 - 22 Apr 2021
Cited by 3 | Viewed by 2009
Abstract
The ductile fracture of thin-shell structures was studied here using a localized necking model. The punching experiments for unstiffened and stiffened panels were compared with numerical predictions using a combined ductile fracture and localized necking model using shell elements. The plasticity and fracture [...] Read more.
The ductile fracture of thin-shell structures was studied here using a localized necking model. The punching experiments for unstiffened and stiffened panels were compared with numerical predictions using a combined ductile fracture and localized necking model using shell elements. The plasticity and fracture model parameters of JIS G3131 SPHC steel were identified by performing calibration experiments on standard flat bars, notched tension, central hole tension, plane strain tension, and shear specimens. The plasticity beyond the onset of necking was modeled using the Swift hardening law. The damage indicator framework with a combined Hosford–Coulomb fracture model and the domain of shell-to-solid equivalence (DSSE) were adopted to characterize the fracture initiation. The model parameters were calibrated based on the loading paths to fracture initiation, which were extracted from a non-linear finite element (FE) analysis. The presented HC–DSSE model was validated using punch tests and was able to predict fracture initiation with good accuracy. Full article
(This article belongs to the Special Issue Ductile and Brittle Fractures in Metals)
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20 pages, 6686 KiB  
Article
Enhanced Robust Design Optimization in Seat Belt Anchorage Strength for Front Crash Safety of Multi-Purpose Vehicle
by Chang Yong Song
Appl. Sci. 2021, 11(3), 1023; https://0-doi-org.brum.beds.ac.uk/10.3390/app11031023 - 23 Jan 2021
Cited by 3 | Viewed by 4888
Abstract
This paper deals with an enhanced robust design optimization (RDO) method and its application to the strength design problem of seat belt anchorage, related to the front crash safety of multi-purpose vehicles. In order to determine the rational design safety of the newly [...] Read more.
This paper deals with an enhanced robust design optimization (RDO) method and its application to the strength design problem of seat belt anchorage, related to the front crash safety of multi-purpose vehicles. In order to determine the rational design safety of the newly developed automotive part, such as the seat, in which the reliability of the evaluation data is not sufficient at the design stage, it is necessary to implement a probabilistic design considering uncertainties. Thickness size variables of the seat frame structure’s members were considered random design variables, including uncertainties such as manufacturing tolerance, which are an inevitable hazard in the design of automotive parts. Probabilistic constraints were selected from the strength performances of the seat belt anchorage test, which are regulated in Economic Commission for Europe (ECE) and Federal Motor Vehicle Safety Standard (FMVSS), and the strength performances were evaluated by finite element analyses. The RDO problem was formulated such that the random design variables were determined by minimizing the seat frame weight subject to the probabilistic strength performance constraints evaluated from the reliability analyses. Three sigma level quality was considered for robustness in side constraints. The mean value reliability method (MVRM) and adaptive importance sampling method (AISM) were used for the reliability analyses in the RDO, and reliability probabilities from the MVRM and the AISM on the probabilistic optimum design were assessed by Monte Carlo simulation (MCS). The RDO results according to the reliability analysis methods were compared to determine the optimum design results. In the case of the RDO with the AISM, the structure reliability was fully satisfied for all the constraint functions, so the most reliable structural safety was guaranteed for the seat frame design. Full article
(This article belongs to the Special Issue Ductile and Brittle Fractures in Metals)
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21 pages, 2681 KiB  
Article
Ductile Fracture Behavior of Mild and High-Tensile Strength Shipbuilding Steels
by Burak Can Cerik and Joonmo Choung
Appl. Sci. 2020, 10(20), 7034; https://0-doi-org.brum.beds.ac.uk/10.3390/app10207034 - 10 Oct 2020
Cited by 13 | Viewed by 3480
Abstract
A comparison is made of the ductility limits of one mild (normal) and two high-tensile strength shipbuilding steels with an emphasis on stress state and loading path dependency. To describe the ductile fracture behavior of the considered steels accurately, an alternative form of [...] Read more.
A comparison is made of the ductility limits of one mild (normal) and two high-tensile strength shipbuilding steels with an emphasis on stress state and loading path dependency. To describe the ductile fracture behavior of the considered steels accurately, an alternative form of ductile fracture prediction model is presented and calibrated. The present fracture model combines the normalized Cockcroft–Latham and maximum shear stress criterion, and is dependent on both stress triaxiality and Lode angle parameter. The calibrations indicate that, depending on the hardening characteristics of the steels, ductile fracture behavior differs considerably with stress state. It is demonstrated that the adopted fracture model is able to predict the ductile fracture initiation in various test specimens with good accuracy and is flexible in addressing the observed differences in the ductile fracture behavior of the considered steel grades. Full article
(This article belongs to the Special Issue Ductile and Brittle Fractures in Metals)
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