Delamination Analysis of Carbon Fiber Reinforced Plastic (CFRP) Composite plates by Thermo graphic technique

Krishnamoorthy, A.; Mercy, J. Lilly; Vineeth, K.S.M.; Salugu, Manoj Kumar

doi:10.1016/j.matpr.2015.07.101

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Different authors have been demonstrated the importance of the proper selection of drill geometry and cutting parameters in order to diminish machining induced damage [17][18][19][20]. Delamination is the most common defect induced during machining [21][22][23][24] Different techniques have been used for delamination [25] measurement, ranging from the use of optical microscopy and the use of image processing techniques [26,27] to the use of thermographic and ultrasonic techniques [28,29].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of the influence of drill point angle when drilling biocomposites

Díaz-Álvarez

Santiuste

et al. 2019

Composite Structures

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Biocomposites are promising materials for traditional composites replacement in specific applications due to their interesting properties and sustainability. Although the composite components are manufactured near net shape, some machining operations, commonly drilling, are commonly required prior to mechanical joining of the components. Tool geometry, mainly the point angle of the drill, strongly affects the performance of the drilling process of composites in terms of machining induced damage.The aim of this work is analyzing the influence of the point angle of the drill on the damage generated during drilling of 100% biodegradable composite, using both numerical and experimental approaches. The novelty of the work relies on the lack of studies of drilling 100% biodegradable composites. The influence of the point angle on the thrust forces and hence in the machining induced damage was demonstrated.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical analysis of the influence of drill point angle when drilling biocomposites

Díaz-Álvarez

Santiuste

et al. 2019

Composite Structures

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“…13 Delamination occurs because of the structure of the composite, created using layers and composed of carbon fibers and a polymer matrix 15 and, typically, some fiber layers peel out and get detached from their adjacent layers. 16 Two types of delamination appear depending on the side of the composite. Thus, at the entrance side, it is possible to recognize peel-up delamination, because of the force acting in the peripheral direction.…”

Section: Introductionmentioning

confidence: 99%

An experimental evaluation of cryogenic machining in the drilling of carbon fiber reinforced plastics for aerospace

Martı́nez¹,

Hernandez

Carou

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The present research aims at studying both dry machining and alternative solutions to wet machining in the drilling of carbon fiber-reinforced polymers (CFRPs). CFRPs are key materials in aerospace and their drilling is critical and challenging. Specifically, cryogenic fluids such as CO2 and N2 were investigated. Drilling tests were performed using three different CFRP laminates. These CFRP laminates are composed of various unidirectional plies of different orientations. Thus, the configurations to analyze were: 0/90/45, 30/60 and 0/90. As output variables, surface roughness, diameter deviation, delamination and thrust forces were analyzed. In general, the internal application of CO2 and dry machining were the best- and worst-performing techniques for surface roughness, respectively. Regarding the dimensional quality, both CO2 and dry machining offered the best results. In the case of LN2 or LN2 + CO2, the results showed that the CFRP configuration is critical for the obtained results. However, it was identified that cryogenics can improve the results of the dry machining process under certain conditions in terms of delamination. Finally, in general, CO2 provided the worst results when attending to the thrust forces.

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“…However, it is commonly found in industry that even after the correct design has been selected and applied, properties of the manufactured CFRP components are often lower than desired. Defects such as: voids [1], disbonds [2], delaminations [3] and cracks [4] introduced during the manufacturing process are often the cause. Apart from the aforementioned defects, there is a growing awareness that the misalignment of fibres, often referred to as fibre waviness, can also lead to significant reductions in strength.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Residual Strains Due to In-Plane Fibre Waviness in Defective Carbon-Fibre Reinforced Polymers Using Ultrasound Data

Patterson

Wang

et al. 2022

J Nondestruct Eval

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Residual strains affect the properties and performance of composite components, therefore measuring and predicting them are important. The prediction of residual strains from a model can be achieved by two steps: the generation of a geometric ply map and the modelling based on that to predict 3D residual strains. A novel method for identifying the most effective algorithm for characterising fibre orientation for the geometric ply map using ultrasound C-scan data has been developed. Finite element models were generated based on the fibre-orientation data from three different algorithms: the Radon transform, 2D fast Fourier transform, and Sobel filter. The models were used to predict residual strains due to three different severities of in-plane fibre waviness induced in a set of 18 specimens. Stratified leave-one-out cross validation was applied to obtain optimum parameters for the three characterisation algorithms and to update the values of the coefficient of thermal expansion for the material. Residual strains on the surface of the specimens were obtained from calculations based on the out-of-plane displacements measured using a digital image correlation system. The predicted and measured residual strain maps were decomposed into feature vectors using orthogonal polynomials to reduce data dimensionality and make quantitative comparisons. The measured residual strains and the predictions based on models using optimised parameters showed good agreement. The differences in performance were quantified based on the accuracy of the predicted residual strains, which showed that the Radon transform performed best.

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Delamination Analysis of Carbon Fiber Reinforced Plastic (CFRP) Composite plates by Thermo graphic technique

Cited by 10 publications

References 9 publications

Experimental and numerical analysis of the influence of drill point angle when drilling biocomposites

Experimental and numerical analysis of the influence of drill point angle when drilling biocomposites

An experimental evaluation of cryogenic machining in the drilling of carbon fiber reinforced plastics for aerospace

Prediction of Residual Strains Due to In-Plane Fibre Waviness in Defective Carbon-Fibre Reinforced Polymers Using Ultrasound Data

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