The influence of hygrothermal environments on the stress concentration in unidirectional composite lamina

Rahnama, Saeed; Rafiee, Roham; Maleki, Mehdi

doi:10.1016/j.mechmat.2018.12.010

Cited by 13 publications

(6 citation statements)

References 35 publications

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“…In order to further simplify Equations (16) and (17), let us introduce new auxiliary functions 1 , 2 such that and can be expressed in terms of 1 , 2 below…”

Section: Exact Hygrothermal Fieldsmentioning

confidence: 99%

“…It is easily found that Equations (16) and (17) can be rewritten as the following decoupled time-fractional partial differential equations…”

Section: Exact Hygrothermal Fieldsmentioning

confidence: 99%

“…Dai et al [16] established a theoretical model to study the single-lap adhesively bonded joint of carbon fiber reinforced resin, a kind of carbon fiber reinforced polymers, and metal with/without adhesive defect under coupled hygrothermal environment. Rahnama et al [17] made a hygrothermal stress analysis of unidirectional composite lamina with aligned broken fibers and examined the effect of temperature and moisture content on the stress concentration factor in composite material.…”

Section: Introductionmentioning

confidence: 99%

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Transient response of hygrothermoelastic field in an elastic plate with an edge crack

Zhang

2020

Z Angew Math Mech

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In order to describe the complex interaction in the heat and moisture transfer process, a coupled time‐fractional hygrothermal theory is developed to describe the anomalous phenomenon of coupled heat and moisture diffusion. The hygrothermoelastic behaviors in a plate with an edge crack are investigated. The surfaces of the plate are both subjected to hygrothermal shocks. The Laplace transform and the finite Fourier transform are applied to seek an analytical solution of temperature change, moisture distribution, and stress response that are expressed in terms of the Mittag‐Leffler function. With this solution, the stress intensity factors at the crack tip are numerically calculated through the weight function method. The coupling effects of the heat and moisture on the stress intensity factors are illustrated graphically for sub‐diffusion, normal diffusion, and super‐diffusion respectively. The results show that the coupling hygrothermal effects are significant and different when compared with the uncoupled model.

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“…In order to further simplify Equations (16) and (17), let us introduce new auxiliary functions 1 , 2 such that and can be expressed in terms of 1 , 2 below…”

Section: Exact Hygrothermal Fieldsmentioning

confidence: 99%

“…It is easily found that Equations (16) and (17) can be rewritten as the following decoupled time-fractional partial differential equations…”

Section: Exact Hygrothermal Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transient response of hygrothermoelastic field in an elastic plate with an edge crack

Zhang

2020

Z Angew Math Mech

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“…The comprehensive effects of the above factors led to the mechanical properties degradation of CFRP laminates, such as the decrease of shear tensile strength, 14,15 elastic modulus, 16,17 fatigue life, 15,18 bending strength, 19 as well as the elongation increase, 20,21 and delamination failure was more likely to occur. 22 Besides the effect of humidity, Saeed et al 23 demonstrated that the increase of temperature caused the resin to soften 23,24 because of the coupling effect of humidity and heat. Niu et al 25 concluded that under the same humidity, the moisture absorbing velocity of CFRP composite increased with the environment temperature rise.…”

Section: Introductionmentioning

confidence: 99%

Strength loss and aging life of single-lap CFRP bonded joints under hygrothermal environment

Zhang

Xing

2023

Journal of Reinforced Plastics and Composites

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Strength evolution of CFRP laminates and bonded joints because of moisture absorption was investigated experimentally. Experiments of accelerated moisture absorption under different temperatures, quasi-static tension, and fracture surfaces morphology observations were conducted. Strength loss and failure modes change due to moisture absorption were discussed in detail. An empirical model of predicting strength loss of the CFRP bonded joints due to moisture absorption was presented using a direct and an indirect method. Based on the time-temperature equivalent principle, a new approach of predicting the aging life of the CFRP bonded joints using the laboratory experimental data was proposed. Experimental data from references were extracted to check the strength loss model. The results demonstrated that the strength loss ratio of CFRP bonded joints soaked in 50°C water for 39 days exceeds 27.4%. The large degradation can attribute to the failure modes change from the interfacial failure to the cohesive failure and then return to the interfacial failure. The ratio of strength loss can be predicted by a first order decay exponential equation.

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“…Since the hygrothermal environments play an important role in the behavior of composite structures, the effects of two parameters of moisture and heat should be considered in the analysis of these structures. [11][12][13][14] Depending on the geometry of the structures and boundary conditions, moisture-induced swelling and heat-induced expansion can seriously affect the buckling phenomenon in composite structures. [15] The first research work in this area is probably Whitney and Ashton's study in which the effects of temperature and humidity of environments on the elastic response of laminated composited plates were investigated.…”

Section: Introductionmentioning

confidence: 99%

Hygrothermal effects on the buckling of soft‐core sandwich plates with composite layered face sheets

2020

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The present work attempts to investigate the influence of hygrothermal environments on the buckling of soft-core sandwich plates with laminated composite face sheets. The stability equations are derived based on piecewise low-order shear deformation theory (PLSDT) and then solved using different methods, depending on the boundary conditions. For fully simply supported sandwich plates, an analytical method is developed which results in some closed-form solutions. For sandwich plates with two parallel simply supported edges and two clamped edges, a semi-analytical solution is established using one-dimensional generalized differential quadrature (GDQ) technique. Finally, for fully clamped sandwich plates, twodimensional GDQ approach is applied to the governing equations. To validate the results of proposed methods, a comparative study with various examples is carried out verifying that the methods in the present work can accurately predict the buckling load of sandwich plates in hot and wet environments. Then, a comprehensive parametric study is performed to show the effects of temperature and moisture content on the buckling of sandwich plates for different parameters such as length-to-thickness ratio, core thickness, and boundary conditions. It is concluded that both temperature and moisture content have significant influences on the buckling behavior of sandwich plates.

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The influence of hygrothermal environments on the stress concentration in unidirectional composite lamina

Cited by 13 publications

References 35 publications

Transient response of hygrothermoelastic field in an elastic plate with an edge crack

Transient response of hygrothermoelastic field in an elastic plate with an edge crack

Strength loss and aging life of single-lap CFRP bonded joints under hygrothermal environment

Hygrothermal effects on the buckling of soft‐core sandwich plates with composite layered face sheets

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