Special Issue "Mechanical Characterization of FRP Composite Materials"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: 31 July 2021.

Special Issue Editor

Assist. Prof. John Montesano
E-Mail Website
Guest Editor
University of Waterloo, Waterloo, Canada
Interests: damage mechanics; non-destructive evaluation; fatigue and fracture; impact and dynamic testing; multi-scale mechanics

Special Issue Information

Dear Colleagues,

Owing to their high specific performance and inherent damage tolerance characteristics, fiber-reinforced plastic (FRP) composite materials have been increasingly utilized for the primary structures of aircraft, spacecraft, marine vehicles, automobiles, and wind turbines. As these structures are continually optimized to improve the performance, the demands imposed on FRP composite materials has notably increased. Therefore, assessing the complex deformation response and failure characteristics of these materials under practical environments and loading conditions remains an active area of research. Mechanical characterization experiments generally aim to improve the understanding of the performance of FRP composite materials, as well as to support the development of the corresponding predictions tools, both of which are vital for product development.

This Special Issue is aimed at soliciting contributions focused on characterizing the mechanical performance of FRP composite materials. The scope of papers includes studies that assess the general deformation response, damage evolution, and failure morphology of conventional and emerging FRP composite materials under various loading conditions (e.g., quasi-static, dynamic, fatigue, and impact). Multi-scale investigations of fracture toughness and damage mechanism evolution, as well as the assessment of manufacturing induced defects and their influence on material performance, are also welcome. Papers targeted at developing novel experimental techniques or non-destructive damage assessment methods for FRP composites will also be considered.

Assist. Prof. John Montesano
Guest Editor

Manuscript Submission Information

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Keywords

  • characterization
  • fiber-reinforced plastic composites
  • mechanical properties
  • damage and failure
  • manufacturing induced defects
  • non-destructive evaluation

Published Papers (3 papers)

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Research

Article
Permanent Deformation and Stiffness Degradation of Open Hole Glass/PA6 UD Thermoplastic Composite in Tension and Compression
Materials 2021, 14(10), 2646; https://doi.org/10.3390/ma14102646 - 18 May 2021
Viewed by 340
Abstract
UD glass/PA6 coupons with an open hole are subjected to tensile and compressive loading. Three layups: [0/90]5s, [+45/−45]5s and [+45/0/−45/90]3s with a shape based on ASTM D5766 were tested. Both monotonic loading as well as loading–unloading–reloading tests were executed. [...] Read more.
UD glass/PA6 coupons with an open hole are subjected to tensile and compressive loading. Three layups: [0/90]5s, [+45/−45]5s and [+45/0/−45/90]3s with a shape based on ASTM D5766 were tested. Both monotonic loading as well as loading–unloading–reloading tests were executed. The strain field on the sample surface was measured with digital image correlation. This allowed identifying the distribution of the strain field during loading, permanent deformation and the evolution of the sample elastic modulus. This information is not frequently measured. Yet, it is vital for the development and validation of advanced failure models. The results indicate that the thermoplastic matrix allows large plastic deformation under tensile loading for the specimens with layup [+45/−45]5s. In addition, the specimen elastic modulus reduces by about 70%. The other layups show minor permanent deformation, while the elastic modulus reduces by up to 15%. Furthermore, the quasi-isotropic laminate shows a significant post-failure load-bearing capacity under compression loading. The results are complemented with post-mortem damage and fracture observations using optical microscopy and ultrasound inspection. Full article
(This article belongs to the Special Issue Mechanical Characterization of FRP Composite Materials)
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Article
Vibro-Thermal Wave Radar: Application of Barker Coded Amplitude Modulation for Enhanced Low-Power Vibrothermographic Inspection of Composites
Materials 2021, 14(9), 2436; https://doi.org/10.3390/ma14092436 - 07 May 2021
Viewed by 316
Abstract
This paper proposes an efficient non-destructive testing technique for composite materials. The proposed vibro-thermal wave radar (VTWR) technique couples the thermal wave radar imaging approach to low-power vibrothermography. The VTWR is implemented by means of a binary phase modulation of the vibrational excitation, [...] Read more.
This paper proposes an efficient non-destructive testing technique for composite materials. The proposed vibro-thermal wave radar (VTWR) technique couples the thermal wave radar imaging approach to low-power vibrothermography. The VTWR is implemented by means of a binary phase modulation of the vibrational excitation, using a 5 bit Barker coded waveform, followed by matched filtering of the thermal response. A 1D analytical formulation framework demonstrates the high depth resolvability and increased sensitivity of the VTWR. The obtained results reveal that the proposed VTWR technique outperforms the widely used classical lock-in vibrothermography. Furthermore, the VTWR technique is experimentally demonstrated on a 5.5 mm thick carbon fiber reinforced polymer coupon with barely visible impact damage. A local defect resonance frequency of a backside delamination is selected as the vibrational carrier frequency. This allows for implementing VTWR in the low-power regime (input power < 1 W). It is experimentally shown that the Barker coded amplitude modulation and the resultant pulse compression efficiency lead to an increased probing depth, and can fully resolve the deep backside delamination. Full article
(This article belongs to the Special Issue Mechanical Characterization of FRP Composite Materials)
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Article
Creep Testing of Thermoplastic Fiber-Reinforced Polymer Composite Tubular Coupons
Materials 2020, 13(20), 4637; https://doi.org/10.3390/ma13204637 - 17 Oct 2020
Cited by 3 | Viewed by 658
Abstract
Thermoplastic fiber-reinforced polymer composites (TP-FRPC) are gaining popularity in industry owing to characteristics such as fast part fabrication, ductile material properties and high resistance to environmental degradation. However, TP-FRPC are prone to time-dependent deformation effects like creep under sustained loading, which can lead [...] Read more.
Thermoplastic fiber-reinforced polymer composites (TP-FRPC) are gaining popularity in industry owing to characteristics such as fast part fabrication, ductile material properties and high resistance to environmental degradation. However, TP-FRPC are prone to time-dependent deformation effects like creep under sustained loading, which can lead to significant dimensional changes and affect the safe operation of structures. Previous research in this context has focused, mainly, on testing of flat coupons. In this study, a creep testing method for TP-FRPC tubular coupons was developed. Specimens were fabricated using tape winding and subjected to well-defined loading conditions, i.e., pure hoop tensile and pure axial compressive stress. Strain gauges and digital image correlation were both employed for strain measurements and were found to be in good agreement. The evolution of strain rate, Poisson’s ratio and creep compliance were investigated. The prediction of experimental data by the Burgers model and the Findley’s power law model were explored. The research findings suggest that the developed experimental and analysis approach provides valuable information for the design of material systems and structures. Full article
(This article belongs to the Special Issue Mechanical Characterization of FRP Composite Materials)
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