Shahed University Journal of Quality Engineering and Production Optimization 8 2 2023 12 01 Designing a Closed-loop Green Supply Chain Network Considering Quality Costs of Raw Materials in a Fuzzy Environment 21 56 4533 10.22070/jqepo.2024.19090.1279 EN Mahya Talebzadeh Department of Industrial Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran Ali Ghodratnama Department of Industrial Engineering, Faculty of Engineering, Kharazmi University, Tehran, Iran 0000-0003-0091-6337 Reza Tavakkoli-Moghaddam School of Industrial Engineering, College of Engineering, University of Tehran, P.O. Box: 11155-4563, Tehran, Iran 0000-0002-6757-926X Journal Article 2024 05 03 When the reverse supply chain—which comprises the steps involved in bringing a product back into the supply chain, such as its collection, recycling, and destruction—is taken into account alongside the forward supply chain, it becomes evident how important this issue has become in recent years and how social and environmental factors have been taken into account to meet economic demands. This paper presents a five-level closed-loop green supply chain network, considering cost minimization, environmental effects, and time delays in sending products and raw materials. The model is presented under uncertainty of some parameters, considering the particular position of purchased raw materials. The tri-objective fuzzy model is converted into a crisp model using the Jiménez et al. (2007) method. The performance and efficiency of the model are analyzed using the Torabi-Hassini method and the augmented epsilon constraint method. GAMS software provides a numerical illustration of this process. Sensitivity analysis is used to the various degrees of confidence. The augmented epsilon-constrained method outperforms the Torabi-Hassini (TH) method for the first and second objective functions and vice versa for the third objective function. The computational time of the augmented epsilon-constrained method is also less than that of the TH method for all confidence levels. https://jqepo.shahed.ac.ir/article_4533_56a8da1d3bcb2e9b334a778be5b1d781.pdf