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Coatings
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Damage and Fracture of Composites
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Damage and Fracture of Composites

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 10373

Special Issue Editors

Prof. Dr. Chao Zhang

E-Mail Website
Guest Editor
1. Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications, Northwestern Polytechnical University, Xi’an 710072, China
2. School of Civil Aviation, Northwestern Polytechnical University, Taicang 215400, China
Interests: mechanics of composites; multiscale modeling; impact dynamics
Prof. Dr. Zhangming Wu

E-Mail Website
Guest Editor
1. Advanced Computational Mechanics Group, Cardiff School of Engineering, Cardiff University, CF10 3AT Cardiff, UK
2. Ningbo University, 315211 Ningbo, China
Interests: aerostructures; composites; buckling and post-buckling; optimization; dynamics

Special Issue Information

Dear Colleagues,

A special issue which entitled “Damage and Fracture of Composites” is organized for the purpose of providing a platform for researchers to share their latest achievements on failure analysis and fracture mechanics of composite materials or structures. The advanced composites have been widely used in the aerospace, automobile, and marine industries due to their excellent mechanical properties, lightweight, and high stiffness to weight ratios, thereby attract much research interests by academic areas and industrial sectors.

However, besides their superior performance, composite materials remain new challenges in practical applications, one of which is its complex failure behaviors, in terms of the damage that leads to the nonlinearity response of the composite and the fracture that leads to the reduction of load-carrying capacity of the materials and structures. Therefore, studying on the damage behaviour and the fracture mechanism of composite materials is critically important in this field.

To this end, research articles and manuscripts which present the latest development and achievements in the field of damage and fracture behaviors of composites are welcome. Apart from the experimental works, the development or innovation in theoretical or numerical methods are recommended but not mandatory. Especially, the failure analysis of composite materials or structures in extreme environments is one of the focuses of this special issue.

In particular, the topic of interest includes but is not limited to:

  • Multi-scale modeling method
  • Progressive damage analysis of laminate and textile composites
  • Fracture mechanics of composite interfaces
  • Buckling and post-buckling of composite structures
  • Optimization design of composite materials and structures
  • Aerospace engineering

Prof. Dr. Chao Zhang
Prof. Dr. Zhangming Wu
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. Coatings 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.

Published Papers (5 papers)

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Research

16 pages, 2305 KiB  
Article
Damage Identification for Shear-Type Structures Using the Change of Generalized Shear Energy
by Yun Sun, Qiuwei Yang and Xi Peng
Coatings 2022, 12(2), 192; https://doi.org/10.3390/coatings12020192 - 2 Feb 2022
Cited by 2 | Viewed by 1235
Abstract
Structural damage identification has become an important topic in the field of civil engineering in recent years. The shear-type structure, such as shear frame structure, is a common type used in civil engineering. In this paper, a damage identification method based on the [...] Read more.
Structural damage identification has become an important topic in the field of civil engineering in recent years. The shear-type structure, such as shear frame structure, is a common type used in civil engineering. In this paper, a damage identification method based on the change of generalized shear energy is proposed for shear-type structures. The main steps of the proposed method are as follows. Firstly, the element stiffness matrix in the structural finite element model is decomposed to obtain the elementary shear force vector. Secondly, the elementary generalized shear energy is calculated by the dot product of the vibration mode shape vector and the elementary shear force vector. Thirdly, structural damage locations can be determined by the changes of elementary generalized shear energy. Finally, more accurate damage localization and quantification are achieved by solving the mode shape sensitivity equation. A 20-storey numerical example and a three-storey experimental model are used to demonstrate the proposed damage identification algorithm. From the numerical and experimental results, it was found that the proposed approach can accurately identify the location and extent of the damage in the shear structures even if the data contain noise. It has been shown that the presented algorithm may be useful in the damage identification of shear-type structures. Full article
(This article belongs to the Special Issue Damage and Fracture of Composites)
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20 pages, 8418 KiB  
Article
Metaheuristic Optimization of Laminated Composite Plates with Cut-Outs
by Celal Cakiroglu, Kamrul Islam, Gebrail Bekdaş, Sanghun Kim and Zong Woo Geem
Coatings 2021, 11(10), 1235; https://doi.org/10.3390/coatings11101235 - 12 Oct 2021
Cited by 9 | Viewed by 1940
Abstract
The stacking sequence optimization of laminated composite plates while maximizing the structural performance or minimizing the weight is a subject investigated extensively in the literature. Meanwhile, research on the optimization of laminates with cut-outs has been relatively limited. Cut-outs being an indispensable feature [...] Read more.
The stacking sequence optimization of laminated composite plates while maximizing the structural performance or minimizing the weight is a subject investigated extensively in the literature. Meanwhile, research on the optimization of laminates with cut-outs has been relatively limited. Cut-outs being an indispensable feature of structural components, this paper concentrates on the stacking sequence optimization of composite laminates in the presence of circular cut-outs. The buckling load of a laminate is used as a metric to quantify the structural performance. Here the laminates are modeled as carbon fiber-reinforced composites using the finite element analysis software, ABAQUS. For the optimization, the widely used harmony search algorithm is applied. In terms of design variables, ply thickness, and fiber orientation angles of the plies are used as continuously changing variables. In addition to the stacking sequence, another geometric variable to consider is the aspect ratio (ratio of the length of the longer sides to the length of the shorter sides of the plate) of the rectangular laminates. The optimization is carried out for three different aspect ratios. It is shown that, by using dispersed stacking sequences instead of the commonly used 0°/±45°/±90° fiber angle stacks, significantly higher buckling loads can be achieved. Furthermore, changing the cut-out geometry is found to have a significant effect on the structural performance. Full article
(This article belongs to the Special Issue Damage and Fracture of Composites)
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15 pages, 9169 KiB  
Article
Effect of Microcracks on the Tensile Properties of 3D Woven Composites
by Jian Huang, Qian Zhao, Yubo Feng, Haili Zhou, Fangfang Sun, Kun Wang, Chao Li, Liquan Zhang and Xuekun Sun
Coatings 2021, 11(7), 794; https://doi.org/10.3390/coatings11070794 - 1 Jul 2021
Cited by 5 | Viewed by 1942
Abstract
This study provides an experimental investigation on the effect of microcracks on the tensile properties of 3D woven composites. A four-step experimental procedure using the combination of micro-XCT, acoustic emission (AE) and digital image correlation (DIC) is here proposed. Typical tensile damage behaviors [...] Read more.
This study provides an experimental investigation on the effect of microcracks on the tensile properties of 3D woven composites. A four-step experimental procedure using the combination of micro-XCT, acoustic emission (AE) and digital image correlation (DIC) is here proposed. Typical tensile damage behaviors were characterized by the stress–strain curves, AE signal analysis and DIC full field strain measurement. Due to a typical four stages stress–strain behavior, phenomena of stiffness degradation and stiffness hardening were successively found during the tensile process. Samples with various damage levels were produced by the in situ AE monitoring. Their 3D microcrack morphologies show the crack initiation, propagation process and the damage modes. Detectable damages initiated during the stress range from 65.98% to 72.93% σs. The cracks volume fraction (CVF) shows a positive correlation relationship with the corresponding tensile load. Moreover, the CVF was used to characterize the degree of damage. The samples with various phased damages were tested again in the fourth step to obtain their residual modulus and residual strength. Detected microcracks have little influence on the residual strength, while the residual modulus witnesses a regular decrease along with the damage increase. The effect of microcracks on the tensile properties is characterized by the relationships between the gradually increased damages and the corresponding residual properties which provide a foundation for damage evaluation of 3D woven structures in service. Full article
(This article belongs to the Special Issue Damage and Fracture of Composites)
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15 pages, 17207 KiB  
Article
Preparation and Mechanical Properties of Layered Cu/Gr Composite Film
by Qifeng Li, Zhenbo Qin, Jingyun Chen, Da-Hai Xia, Yida Deng, Yiwen Zhang, Zhong Wu and Wenbin Hu
Coatings 2021, 11(5), 502; https://doi.org/10.3390/coatings11050502 - 24 Apr 2021
Cited by 5 | Viewed by 1910
Abstract
Graphene (Gr) has proved its significant role as a reinforcement material in improving the strength of metal matrix composites due to its excellent mechanical properties. In this paper, Gr/Cu composite film with a layered structure was prepared by layering electrodeposition. The directional distribution [...] Read more.
Graphene (Gr) has proved its significant role as a reinforcement material in improving the strength of metal matrix composites due to its excellent mechanical properties. In this paper, Gr/Cu composite film with a layered structure was prepared by layering electrodeposition. The directional distribution of Gr in the Cu film was insured by this method, which gives play to its ultra-high-strength in a two-dimensional plane. In the meantime, the effect of electrodeposition time on the distribution structure of the Gr layer was studied. The structure analysis and mechanical properties test show that the strength of the layered Gr/Cu composite film is greatly improved compared to the pure Cu film. Furthermore, the strength of the composite film increases at the beginning and then decreases with the electrodeposition time of the Gr layer increasing, while the coverage and the degree for the layer stacking of Gr gradually increase in this process. In conclusion, the influence of different Gr distributions on the mechanical properties of the composite film has been studied by combining the experimental results with molecular dynamics simulation, which lays an effective foundation for further optimizing the structure of Gr in the layered composite film and improving the mechanical properties. Full article
(This article belongs to the Special Issue Damage and Fracture of Composites)
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16 pages, 3403 KiB  
Article
Rate-Dependent Cohesive Models for Dynamic Mode I Interfacial Propagation and Failure of Unidirectional Composite Laminates
by Chenxu Zhang, Huifang Liu, Junchao Cao and Chao Zhang
Coatings 2021, 11(2), 191; https://doi.org/10.3390/coatings11020191 - 7 Feb 2021
Cited by 5 | Viewed by 2386
Abstract
With the increasing application of composite materials in anti-impact structure, the development of reliable rate-dependent interlaminar constitutive model becomes necessary. This study aims to assess and evaluate the applicability of three types of rate-dependent cohesive models (logarithmic, exponential and power) in numerical delamination [...] Read more.
With the increasing application of composite materials in anti-impact structure, the development of reliable rate-dependent interlaminar constitutive model becomes necessary. This study aims to assess and evaluate the applicability of three types of rate-dependent cohesive models (logarithmic, exponential and power) in numerical delamination simulation, through comparison with dynamic test results of double cantilever beam (DCB) specimens made from T700/MTM28-1 composite laminate. Crack propagation length history profiles are extracted to calibrate the numerical models. Crack propagation contours and fracture toughness data are predicted, extracted and compared to investigate the difference of the three different rate-dependent cohesive models. The variation of cohesive zone length and force profiles with the implemented models is also investigated. The results suggest that the crack propagation length can be better predicted by logarithmic and power models. Although crack propagation length profiles are well predicted, the numerical calculated dynamic fracture toughness tends to be higher than that of experimental measured results. The three models also show differences in the prediction of maximum loading forces. The results of this work provide useful guidance for the development of more efficient cohesive models and more reliable interface failure simulation of impact problems. Full article
(This article belongs to the Special Issue Damage and Fracture of Composites)
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