Fatigue and reliability analysis of nano-modified scarf adhesive joints in carbon fiber composites

Khashaba, U.A.; Aljinaidi, A.A.; Hamed, Mostafa A.

doi:10.1016/j.compositesb.2017.04.001

Cited by 56 publications

(51 citation statements)

References 39 publications

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“…Agglomerations of MWCNTs reduce the interfacial area in the nanocomposites, and hence reduce the opportunity to take the advantage of the unique properties of the MWCNTs [19] . Based on the extensive literature survey, a 0.5wt% MWCNTs was selected, which showed improvements in the mechanical properties for different epoxy systems by many researchers [2][3][4][5][6][7][8][9][10][11] . The mass of the MWCNTs was estimated based on the total mass of PY 1092-1/HY 1092 epoxy system using digital balance with sensitivity of 0.0001 g.…”

Section: Determination the Mass Of Mwcnts And Epoxymentioning

confidence: 99%

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Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Badawy

Khashaba

2018

Eng. Sci. and Milit. Techno.

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In the present work, tensile, shear and impact properties of epoxy modified with multi-walled carbon nanotubes (MWCNTs) are measured experimentally in accordance with ASTM standards. The MWCNTs were dispersed into the epoxy resin using ultrasonic processor. To avoid damaging the nanotubes, the sonication process was performed at low-amplitude (225W) in a short duration of 30 min. The mixture was evacuated to remove air bubbles before further mixing with hardener. Results from the experimental study showed that incorporation of the MWCNTs into the epoxy resin improves the tensile strength and modulus of the MWCNT-nanocomposite by 11% and 68.7%, respectively, compared with those of the neat epoxy. The shear strength and inplane shear modulus of the MWCNT-nanocomposite were improved by 22.2% and 29%, respectively. The drop weight impact performance of the MWCNT-nanocomposite showed an improvement in the maximum contact force and the absorbed energy of the MWCNT-nanocomposite by 9.5% and 11.4%, respectively.

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Section: Determination the Mass Of Mwcnts And Epoxymentioning

confidence: 99%

“…Moderate loading percentage of MWCNTs can result in good dispersion as well as lower agglomeration. Accordingly, based on the extensive literature survey, a 0.5 wt% MWCNTs was selected that showed improvements in the mechanical properties for different epoxy systems by many researchers [2][3][4][5][6][7][8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Badawy

Khashaba

2018

Eng. Sci. and Milit. Techno.

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“…A review of relevant literature is conducted on the state-of-the-art and the challenges of designing and producing the next generation of c-Si PV module that will possess improved thermo-mechanical reliability at elevated temperature operations. Current research on fatigue life, reliability, thermo-mechanical response and influence of elevated temperature on structures, composites and laminates includes Lyubimova, L.L et al 2017 [8], Mejri et al 2017 [9] and Khashaba et al 2017 [10]. A better understanding of the thermo-mechanical deformation degradation of the laminates is found to be the key to designing the required module.…”

Section: State Of Investigationmentioning

confidence: 99%

Thermo-mechanical deformation degradation of crystalline silicon photovoltaic (c-Si PV) module in operation

Amalu

Hughes

Nabhani

et al. 2018

Engineering Failure Analysis

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Reliability and meantime to failure (MTTF) of crystalline silicon photovoltaic (c-Si PV) module operating at elevated temperature can be increased through in-depth understanding of the mechanics of thermo-mechanical deformation and degradation of the laminates bonded together in the system. The knowledge is critical to developing the next generation of robust c-Si PV modules. Deployment in elevated ambient temperature reduces the 25-year design life by inducing excessive deformation that results in significant laminate degradation. The research investigates the thermo-mechanical deformation of c-Si PV module. Analytical and simulation methods are employed in the investigation. The IEC 61215 test qualification is used. Ethylene vinyl acetate (EVA) and solder materials responses are modelled as temperature dependent with appropriate material models. Analytical technique for validating simulation results of the response of c-Si PV module to temperature load is presented. The laminate's stiffness is found to be governed by the stiffness ratio magnitude of silicon which is the most stressed component. The deformation ratio of EVA is highest and significantly determines the degree of variation of gap between solar cells. The EVA exhibits the highest susceptibility to thermo-mechanical deformation followed by the solder which is found to accumulate the highest magnitude of strain energy density. The research presents an analytical method that can be used to validate the output of computer-simulation of the magnitude of strain energy density of solder in c-Si PV modules.

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“…This paper focuses on improvement of mechanical performance of CFRP adhesive joints, called 'laminated joints'. Examples of CFRP composite adhesive joints include single-lap [15,16], double-lap [17,18], stepped [19,20], and scarf-lap [21][22][23][24] The CFRP joints and fabrics were made using VARTM and compared to one another in terms of flexural properties in both static and fatigue loadings, and impact strength. In addition, the fracture surfaces generated during impact testing are investigated using microscopy in order to identify possible differences in the failure mode as a function of the type of joint.…”

Section: Introductionmentioning

confidence: 99%

A comparison of CFRP composite laminated joints fabricated with vacuum assisted resin transfer molding

Asadi¹,

Abusrea²,

Arakawa³

et al. 2018

Express Polym. Lett.

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Abstract. The objective of this study is to improve the mechanical performance of carbon fiber reinforced polymer (CFRP) adhesive joints, called 'laminated joints'. The laminated joints are made by stacking two dry carbon fiber fabric halves together and molding using vacuum-assisted resin transfer molding (VARTM) process. An improved design of this joint was fabricated by overlapping the two half fabrics and adding extra carbon fiber fabric pieces. Four joints are considered in this work: a conventional laminated joint, two laminated joints with overlap, and a multiple-covers laminated joint. The composite joints are characterized in terms of static flexural and impact strength and fatigue performance. In addition, post-fracture analysis is performed using optical microscopy to identify the dependence of failure modes and its propagation in composite joints.

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Fatigue and reliability analysis of nano-modified scarf adhesive joints in carbon fiber composites

Cited by 56 publications

References 39 publications

Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Fabrication and characterization of epoxy modified with 0.5% MWCNTs

Thermo-mechanical deformation degradation of crystalline silicon photovoltaic (c-Si PV) module in operation

A comparison of CFRP composite laminated joints fabricated with vacuum assisted resin transfer molding

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