Digital microscopy and image analysis applied to composite materials characterization

Paciornik, Sidnei; d'Almeida, J.

doi:10.1590/s1517-70762010000200013

Cited by 14 publications

(17 citation statements)

References 9 publications

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“…In the tape winding process, void content can be effectively used to distinguish the physical performance of products. The methods of void content measurement are various such as density measurements, microscopy method [ 21 , 28 ], ultrasonic attenuation [ 29 ], and X-ray computed tomography [ 30 ], etc. The microscopy method has some advantages like straightforward operation, high precision, and sample calculation.…”

Section: Experiments Procedures and Resultsmentioning

confidence: 99%

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Multi-Response Parameter Interval Sensitivity and Optimization for the Composite Tape Winding Process

Deng

Shi

et al. 2018

Materials

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The composite tape winding process, which utilizes a tape winding machine and prepreg tapes, provides a promising way to improve the quality of composite products. Nevertheless, the process parameters of composite tape winding have crucial effects on the tensile strength and void content, which are closely related to the performances of the winding products. In this article, two different object values of winding products, including mechanical performance (tensile strength) and a physical property (void content), were respectively calculated. Thereafter, the paper presents an integrated methodology by combining multi-parameter relative sensitivity analysis and single-parameter sensitivity analysis to obtain the optimal intervals of the composite tape winding process. First, the global multi-parameter sensitivity analysis method was applied to investigate the sensitivity of each parameter in the tape winding processing. Then, the local single-parameter sensitivity analysis method was employed to calculate the sensitivity of a single parameter within the corresponding range. Finally, the stability and instability ranges of each parameter were distinguished. Meanwhile, the authors optimized the process parameter ranges and provided comprehensive optimized intervals of the winding parameters. The verification test validated that the optimized intervals of the process parameters were reliable and stable for winding products manufacturing.

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Section: Experiments Procedures and Resultsmentioning

confidence: 99%

“…They found additional repetitive passes with hot gas and consolidation roller force contributed to the reduction of void content in most top layers. In S. Paciornik’s work [ 21 ], digital microscopy was used to characterize the microstructure of fiber-reinforced composite tubes manufactured by filament winding. B.N.…”

Section: Introductionmentioning

confidence: 99%

Multi-Response Parameter Interval Sensitivity and Optimization for the Composite Tape Winding Process

Deng

Shi

et al. 2018

Materials

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“…Voids in composite tape winding products are defects that principally exist between tape layers due to residual air bubbles, resin flow, and sufficient compaction during resin flow. Density measurements, microscopy [33][34][35][36][37][38][39], ultrasonic attenuation [40], and X-ray computed tomography [41] can be used to measure void content. e electronic micrograph method has the highest porosity detection accuracy, which is specified by GB/ T3365-2008 [42].…”

Section: Residual Stressmentioning

confidence: 99%

Multiresponse Parameter Optimization for the Composite Tape Winding Process Based on GRA and RSM

Hong

Shi

2020

Mathematical Problems in Engineering

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Composite tape winding is an important forming process of composite materials, which can ensure good performance of composite products. Selection and control of key process parameters in the winding process have a great influence on the properties of products, such as void content and residual stress of products. Through experimental analysis, the residual stress and void content of the composite products are not the minimum when the prepreg winding process is carried out by using the empirical process parameters. To solve this multiobjective optimization problem, experiments were conducted using the Box–Behnken design. The multiobjective optimization problem is converted to a single-objective problem using grey relational analysis (GRA). Principal component analysis (PCA) is used to quantify the relative contributions of residual stress and void content. Regression analysis of grey relational grade (GRG) based on the experimental data was used to develop a second-order GRG prediction model. The winding process parameters were optimized with response surface methodology (RSM), and the winding experiments were carried out with these parameters. The experimental results show that the best combination of process parameters yields the best GRG results with better void content and residual stress.

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“…where α and β are change rates of the adaptation. According to |Ŝ| ≤ ε, S ε , and (41) can be rewritten as follows: (43) whereM can be obtained from the adaptation of…”

Section: Dead-zone Compensationmentioning

confidence: 99%

Dynamics Modeling and Tension Control of Composites Winding System Based on ASMC

2020

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Tension is a key processing parameter in the process of composite fiber tape winding. The fluctuation of tension will affect the accuracy of winding and the performance of winding products, such as stress uniformity, fatigue resistance, strength, compactness and resin content. In view of the winding tension is time-varying and the application of tension needs to be more accurate, a tension calculation model is established. Due to the influence of dynamic performance of tension control system by cogging torque, inverter dead zone, ring gear clearance, friction torque, parameter drift, and measurement noise, an adaptive sliding mode control (ASMC) based on extended state observer (ESO) is proposed. The stability of the closed-loop system is proven by Lyapunov theory, the system state variables is estimated by ESO, and the input dead-zone is compensated by the designed adaptive law. Simulation and experimental results show that ESO-based ASMC improves the robustness and dynamic response performance of the tension control system, and can effectively suppress the chattering of the sliding mode control system. The void content and residual stress of composite products have been improved obviously. INDEX TERMS Composites tape winding, dynamics modeling, ESO, ASMC, tension control.

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Digital microscopy and image analysis applied to composite materials characterization

Cited by 14 publications

References 9 publications

Multi-Response Parameter Interval Sensitivity and Optimization for the Composite Tape Winding Process

Multi-Response Parameter Interval Sensitivity and Optimization for the Composite Tape Winding Process

Multiresponse Parameter Optimization for the Composite Tape Winding Process Based on GRA and RSM

Dynamics Modeling and Tension Control of Composites Winding System Based on ASMC

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