Mechanical and failure analysis of thick composites under hygrothermal conditions by a novel coupled hygro-thermo-mechanical multiscale algorithm

Gholami, Meghdad; Afrasiab, Hamed; Baghestani, Ali Mohammad; Fathi, Alireza

doi:10.1016/j.compscitech.2022.109773

Cited by 14 publications

(5 citation statements)

References 39 publications

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“…Furthermore, sections of the images showed a wave-like damage morphology, which indicates the presence of the matrix cracking damage mode. Thus, at the microscale, the presence of these damage modes (matrix cracking, fibre breakage, and fibre breakage with pull-out) corroborated the morphological damage phenomenon earlier observed in the μ-CT images; a similar trend was also reported by [ 46 ]. Having demonstrated the effectiveness of this methodology for exploring the damage morphology of the FRPs, it is suggested that this approach could be expanded to elucidating the energy absorption and damage sequence of FRPs subjected to extreme environmental conditions, such as seawater and Arctic temperatures.…”

Section: Resultssupporting

confidence: 88%

Damage Assessment of Glass-Fibre-Reinforced Plastic Structures under Quasi-Static Indentation with Acoustic Emission

Osa-uwagboe,

Udu,

Silberschmidt

et al. 2023

Materials

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The use of fibre-reinforced plastics (FRPs) in various industrial applications continues to increase thanks to their good strength-to-weight ratio and impact resistance, as well as the high strength that provides engineers with advanced options for the design of modern structures subjected to a variety of out-of-plane impacts. An assessment of the damage morphology under such conditions using non-destructive techniques could provide useful data for material design and optimisation. This study investigated the damage mechanism and energy-absorption characteristics of E-glass laminates and sandwich structures with GFRP face sheets with PVC cores under quasi-static indentation with conical, square, and hemispherical indenters. An acoustic emission (AE) technique, coupled with a k-means++ pattern-recognition algorithm, was employed to identify the dominant microscopic and macroscopic damage mechanisms. Additionally, a post-mortem damage assessment was performed with X-ray micro computed tomography and scanning electron microscopy to validate the identified clusters. It was found that the specific energy absorption after impact with the square and hemispherical indenters of the GFRP sandwich and the plain laminate differed significantly, by 19.29% and 43.33%, respectively, while a minimal difference of 3.5% was recorded for the conical indenter. Additionally, the results obtained with the clustering technique applied to the acoustic emission signals detected the main damaged modes, such as matrix cracking, fibre/matrix debonding, delamination, the debonding of face sheets/core, and core failure. The results therefore could provide a methodology for the optimisation and prediction of damage for the health monitoring of composites.

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Section: Resultssupporting

confidence: 88%

Damage Assessment of Glass-Fibre-Reinforced Plastic Structures under Quasi-Static Indentation with Acoustic Emission

Osa-uwagboe,

Udu,

Silberschmidt

et al. 2023

Materials

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“…Gholami et al 45 conducted multiscale simulations on the three-point bending of CFRP laminates, and although the type of sequence of plies was different, the similarity was in good agreement with experimental results. In this study, the simulated and experimental force-displacement curves of the moisture absorption saturated CFRP laminate subjected to three-point bending was compared in Figure 11.…”

Section: Stiffness Degradation Rulementioning

confidence: 74%

Multiscale simulation of hygrothermal stress and mechanical properties degradation of carbon fiber reinforced polymers laminates

Yu,

Ze,

Zhang

et al. 2024

Polymer Composites

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A mesoscopic representative volume element (RVE) model of carbon fiber reinforced polymers (CFRP) laminate with 15 plies was established based on the principle of fiber random disturbance. The RVE model was validated by comparing the elastic parameters calculated by the RVE model, Chamis model, and Bridge model. Wet stress and thermal stress were coupled using a sequential method. Macroscopic and microscopic subroutines were developed to calculate the stress–strain field of CFRP laminate and RVE model. A multiscale numerical simulation of three‐point bending of moisture‐saturated CFRP laminate was conducted. Failure process and failure modes of CFRP laminate were discussed based on the multiscale simulation and SEM observations. The results show that the RVE model and the multiscale simulation strategy presented in this work can predict the coupled hygrothermal stress and the strength degradation due to moisture absorption very well. The maximum error between the simulated and experimental averaged force of the moisture‐saturated CFRP laminate subjected to three‐point bending is about 3.4%. Multiscale simulation demonstrated that uneven distribution of fibers can result in the fiber/matrix interfaces bearing a larger transverse stress in the fiber's dense distribution area. It is the main reason that results in fiber/matrix interface failure of CFRP laminates working in hygrothermal environments.Highlights A RVE model of CFRP laminate was presented using fibers random disturbance. Coupled hygrothermal stress of single fiber and surrounded matrix was obtained. A multiscale simulation of the strength change of the CFRP plate due to wet‐thermal stress was conducted. Failure modes of CFRP laminate are discussed based on the multiscale simulation.

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“…5 (10) In the next step, h ðkÞ rr and h ðkÞ rφ are selected as the basic terms of 00 Ρ 00 and assuming:…”

Section: Basic Formulationsmentioning

confidence: 99%

“…Some researchers have focused on the hygrothermal effects and considered moisture as well: Wang et al 9 conducted a comprehensive experimental study about the effects of temperature and hygrothermal on the open-hole mechanical properties of HS6/AC318 glass/epoxy multidirectional laminates. Gholami et al 10 developed a novel coupled hygro-thermo-mechanical multiscale-APFEA (HTM-multiscale-APFEA) algorithm to precisely predict the mechanical and failure behavior of thick fiber-reinforced laminated composites under hygrothermal conditions. The Fourier and Fick’s equations were simultaneously solved by the proposed fully-coupled temperature-moisture concentration (FCTM) algorithm to account for their mutual effects on each other.…”

Section: Introductionmentioning

confidence: 99%

Free-edge effects at circular holes in composite laminates under hygrothermomechanical load

Kharghani,

Mittelstedt

2023

Journal of Composite Materials

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In this paper, the free-edge effects which play an important role in the failure analysis of composite laminates are studied. Pure temperature change and its combination with biaxial tension are investigated for a composite plate with a centric circular hole that is adequately small in comparison to the dimension of the plate. Moreover, the laminate is assumed to be thin, the temperature change of all points of the plate is identical and the biaxial tensile load is applied far from the center of the hole. For this purpose, a semi-analytical method based on a two-dimensional thermoelastic boundary layer theory and a minimum potential energy principle is proposed. It is shown that the present method predicts the interlaminar peeling and shear stresses surrounding the hole with good agreement compared to the results obtained by FEM analysis.

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Mechanical and failure analysis of thick composites under hygrothermal conditions by a novel coupled hygro-thermo-mechanical multiscale algorithm

Cited by 14 publications

References 39 publications

Damage Assessment of Glass-Fibre-Reinforced Plastic Structures under Quasi-Static Indentation with Acoustic Emission

Damage Assessment of Glass-Fibre-Reinforced Plastic Structures under Quasi-Static Indentation with Acoustic Emission

Multiscale simulation of hygrothermal stress and mechanical properties degradation of carbon fiber reinforced polymers laminates

Free-edge effects at circular holes in composite laminates under hygrothermomechanical load

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