Multi attribute decision making through COPRAS on tensile properties of hybrid fiber metal laminate sandwich structures for aerospace and automotive industries

Awd Allah, Mahmoud M; Abd El-baky, Marwa A; Alshahrani, Hassan; Sebaey, Tamer A; Hegazy, Dalia A

doi:10.1177/00219983231194260

Cited by 18 publications

(1 citation statement)

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“…Specifically, COPRAS utilizes a comprehensive performance index that combines the weights of different attributes and the scores of each alternative to evaluate the overall performance of each alternative. Recently, some scholars have applied it to solve various problems [64][65][66][67][68]. EK Zavadskas et al [69] developed a methodology based on COPRAS for multi-attribute assessment for road construction.…”

Section: Copras Methodsmentioning

confidence: 99%

An Online Review-Driven Picture Fuzzy Multi-Criteria Group Decision-Making Approach for Evaluating the Online Medical Service Quality of Doctors

Shi,

Peng

2024

Symmetry

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In order to further investigate the level of online medical services in China and improve the medical experience of patients, this study aims to establish an online review-driven picture fuzzy multi-criteria group decision-making (MCGDM) approach for the online medical service evaluation of doctors. First, based on the Aczel–Alsina t-norm and t-conorm, the normal picture fuzzy Aczel–Alsina operations involving a variable parameter are defined to make the corresponding operations more flexible than other operations. Second, two picture fuzzy Aczel–Alsina aggregation operators are developed, and the corresponding properties are discussed as well. Third, combined with the online review information of China’s medical platform Haodaifu, the online review-driven evaluation attributes and their corresponding weights are obtained, which can make the evaluation model more objective. Fourth, an extended normal picture fuzzy complex proportional assessment (COPRAS) decision-making method for the service quality evaluation of online medical services is proposed. Finally, an empirical example is presented to verify the feasibility and validity of the proposed method. A sensitivity analysis and a comparison analysis are also conducted to demonstrate the effectiveness and flexibility of the proposed approach.

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Section: Copras Methodsmentioning

confidence: 99%

An Online Review-Driven Picture Fuzzy Multi-Criteria Group Decision-Making Approach for Evaluating the Online Medical Service Quality of Doctors

Shi,

Peng

2024

Symmetry

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Lateral crashing response of thin‐walled composite structures filled with carbon nanopowder

Hegazy,

Awd Allah,

Alshahrani

et al. 2023

Polymer Composites

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In this article, the performance of transversely loaded glass fiber reinforced epoxy (GFRE) tubular components containing carbon nanopowder (CNP) in terms of crashworthiness was investigated. The wet‐wrapping by hand lay‐up procedures were used to make GFRE tubes that included 0, 0.25, 0.50, 1, 2, 3, and 4 wt% of CNP. For the laterally loaded tubes, the crashing load and total absorbed energy (TAE) versus displacement responses were displayed. The histories of deformation were tracked in addition. As part of the crashworthiness analysis, the TAE and specific absorbed energy (SEA) were evaluated. Overall results demonstrated that CNP enhances both TAE and SEA up to 0.50 wt% of CNP; after that, a significant deterioration was noticed. CNP, at very low wt%, is considered a great choice for enhancing the crashworthiness performance of composite structures.Highlights The designed tubes, that is, GFRE tubes filled with 0, 0.25, 0.50, 1, 2, 3, and 4 wt% of CNP, were created using wet‐wrapping by hand lay‐up techniques. The fabricated tubes were subjected to lateral compression loads to investigate their crashworthiness behavior. The crashing load and absorbed energy versus displacement responses for the laterally loaded tubes were exposed. The history of deformation for each specimen was also examined. The experimental results were analyzed and discussed.

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Optimizing the crashworthy behaviors of hybrid composite structures through Taguchi approach

Awd Allah,

Abd El Aal,

Abd El‐baky

2024

Polymer Composites

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This paper calculates the crashworthiness capability of glass‐reinforced epoxy composites over wrapped polyvinyl chloride (PVC) circular tubes with a triggering mechanism in the form of cutouts. The intended tubes were prepared by a wet wrapping method; after which they were subjected to quasi‐static axial compression. To compute crashworthiness indications, three design parameters, each at three levels, were used. The design parameters are the hole diameter (d), the hole's number (n), and the hole position (L). The Taguchi technique has been employed in the design of experiments (DOE) tactic to obtain the best crashworthiness parameters. With the maximum specific energy absorbed (SEA) and crashing force efficiency (CFE), the optimal parameters were found. Furthermore, the main effect, signal‐to‐noise ratio (S/N), as well as the analysis of variance (ANOVA), have been studied using the commercial software programme MINITAB 18. A few experiments were accompanied by the L9 orthogonal array. According to the results, “N” has the largest impact on the value of SEA with a contribution percent of 29.27%. While “d” has the main influence on the value of CFE with a contribution percent of 67.29%. Lastly, tests for confirmation were performed. to verify the predicted values in light of the experimental results. The optimized SEA developed tube is 74.72%, which is higher than the intact PVC tube and 12.29% lower than the intact hybrid tube. However, the optimum CFE was also 48 and 29.82% higher than the intact PVC tube and the intact hybrid tube, respectively.Highlights The number of holes has the highest impact on SEA value by 29%. The ideal specimen enhances SEA by 75% compared to the intact PVC tube. Hole diameter has the most influence on CFE value by 67%. The best specimen improves the CFE by 48% related to the intact PVC tube.

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Multi attribute decision making through COPRAS on tensile properties of hybrid fiber metal laminate sandwich structures for aerospace and automotive industries

Cited by 18 publications

References 84 publications

An Online Review-Driven Picture Fuzzy Multi-Criteria Group Decision-Making Approach for Evaluating the Online Medical Service Quality of Doctors

An Online Review-Driven Picture Fuzzy Multi-Criteria Group Decision-Making Approach for Evaluating the Online Medical Service Quality of Doctors

Lateral crashing response of thin‐walled composite structures filled with carbon nanopowder

Optimizing the crashworthy behaviors of hybrid composite structures through Taguchi approach

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