Residual Tensile Strength of the Multi-Impacted Scarf-Repaired Glass Fiber-Reinforced Polymer (GFRP) Composites

Kumari, Punita; Wang, Jihui; Khan, Saahil

doi:10.3390/ma11122351

Cited by 18 publications

(11 citation statements)

References 28 publications

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“…Different authors have used this technique to estimate and compare the damaged area. Similar results were reported when compared with other complex and expensive techniques [ 26 , 38 ]. To calculate the damaged area, a MATLAB routine was specifically developed.…”

Section: Methodssupporting

confidence: 87%

“…Fiber breakage mainly occurs at the impact face by compression and buckling, and at the back face as a consequence of tensile stress. Delamination and matrix cracking take place in the matrix, as reported by Robinson et al [ 25 ] and Kumari et al [ 26 ]. This means that the impact properties are strongly dominated by the matrix and influenced by its mechanical properties and possible defects.…”

Section: Introductionmentioning

confidence: 73%

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Enhanced Low-Velocity Impact Properties for Resin Film Infusion-Manufactured Composites by Flow-Control Approach

et al. 2021

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The optimization of the mechanical properties of composite materials has been a challenge since these materials were first used, especially in aeronautics. Reduced energy consumption, safety and reliability are mandatory to achieve a sustainable use of composite materials. The mechanical properties of composites are closely related to the amount of defects in the materials. Voids are known as one of the most important defect sources in resin film infusion (RFI)-manufactured composites. Minimizing the defect content leads to maximized mechanical properties and lightweight design. In this paper, a novel methodology based on computer vision is applied to control the impregnation velocity, reduce the void content and enhance the impact properties. Optimized drop-impact properties were found once the impregnation velocity was analyzed and optimized. Its application in both conventional and stitching-reinforced composites concludes with an improvement in the damage threshold load, peak force and damaged area. Although stitching tends to generate additional voids and reduces in-plane properties, the reduction in the damaged area means a positive balance in the mechanical properties. At the same time, the novel methodology provides the RFI process with a noticeable level of automation and control. Consequently, the industrial interest and the range of applications of this process are enhanced.

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Section: Methodssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 73%

Enhanced Low-Velocity Impact Properties for Resin Film Infusion-Manufactured Composites by Flow-Control Approach

et al. 2021

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“…Generally, the resistance of material under the cyclic loading is quantified by the residual strength model. [42][43][44][45] Residual strength is defined as the ability of GFRP to resist the cyclic loading at a given service time. In engineering applications, the strength degradation law of GFRP plays a key role in reliability assessment.…”

Section: Residual Strength Model Of Gfrp Based On Sds Principlementioning

confidence: 99%

Reliability model for wind turbine blade composites under alternate action of normal and extreme wind loads

Gao

Yuan

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Wind turbine blade is the key component to capture wind power, and it is mainly composed of glass fiber reinforced polymer (GFRP). Due to the randomness and volatility of wind speed in nature, wind turbine blade is usually subjected to the alternate action of normal and extreme wind loads during its long-term service. In this study, a reliability model that considering the stochastic wind loads and strength degradation of GFRP is proposed. Firstly, a residual strength model is developed based on the Palmgren-Miner (P-M) damage theory and the same damage state (SDS) principle, which is capable of characterizing the strength degradation law of GFRP under the normal wind load. Then, the alternate actions of normal and extreme wind loads are considered, and a dynamic reliability model is presented based on Poisson process and mathematical derivation. Finally, the traditional discrete stress-strength interference (DSSI) model is extended to calculate the dynamic reliability when probability distributions of stochastic wind loads and residual strength of GFRP are unknown. The wind load data and GFRP test data are utilized to demonstrate the effectiveness of the proposed model. The result shows that the reliability of GFRP keeps at a high level in the early stage, then it rapidly decreases due to the accumulation of fatigue damage.

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“…It has been shown that a decrease in scarf angle as well as an increase in external reinforcement plies on the surface of a repair leads to an increase in failure loads [ 14 , 15 , 16 , 17 , 18 , 19 ]. In practice and in the literature, a scarf ratio of 1:50 has been shown to be a good compromise between repair size and properties, with 70–80% static tensile strength restoration and over 80% post-impact residual tensile strength [ 3 , 12 , 20 ]. As a scarf patch carries the load of a post-repaired component, it has been shown to be most effective when the repair and parent ply stacking sequence are equivalent.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanisms of GFRP Scarf Joints under Tensile Load

2021

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A potential repair alternative to restoring the mechanical properties of lightweight fiber-reinforced polymer (FRP) structures is to locally patch these areas with scarf joints. The effects of such repair methods on the structural integrity, however, are still largely unknown. In this paper, the mechanical property restoration, failure mechanism, and influence of fiber orientation mismatch between parent and repair materials of 1:50 scarf joints are studied on monolithic glass fiber-reinforced polymer (GFRP) specimens under tensile load. Two different parent orientations of [−45/+45]2S and [0/90]2S are exemplarily examined, and control specimens are taken as a baseline for the tensile strength and stiffness property recovery assessment. Using a layer-wise stress analysis with finite element simulations conducted with ANSYS Composite PrepPost to support the experimental investigation, the fiber orientation with respect to load direction is shown to affect the critical regions and thereby failure mechanism of the scarf joint specimens.

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Residual Tensile Strength of the Multi-Impacted Scarf-Repaired Glass Fiber-Reinforced Polymer (GFRP) Composites

Cited by 18 publications

References 28 publications

Enhanced Low-Velocity Impact Properties for Resin Film Infusion-Manufactured Composites by Flow-Control Approach

Enhanced Low-Velocity Impact Properties for Resin Film Infusion-Manufactured Composites by Flow-Control Approach

Reliability model for wind turbine blade composites under alternate action of normal and extreme wind loads

Failure Mechanisms of GFRP Scarf Joints under Tensile Load

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