JIEMS Journal of Industrial Engineering and Management Studies Vol. 6, No. 1, 2019, pp. 111-129 DOI: 10.22116/JIEMS.2019.87662 www.jiems.icms.ac.ir A quantitative model for optimization and disruption mitigation in a supply chain (Auto parts case study) Seyed Ali Alavikia 1 , Mohammad Taghi TaghaviFard 2,* , Maghsoud Amiri 2 , Parham Azimi 3 Abstract However, there is a lot of capital and plenty of manpower in the auto spare part industry, the enterprises and supply chains of this industry do not perform well in our country. This research models a three- level supply chain with multiple manufacturers, distribution centers and retailers, to minimize the total cost by taking into account various disruptions. The database of two active car spare parts companies for five strategic products in one year has been used. Then, the mathematical model is analyzed by considering disruptions based on three different sales policies: back orders, lost sales and outsourcing. Besides, to evaluate the performance of the model some numerical examples are used and analyzed to determine that algorithm works. Model solved efficiently by MATLAB software. The results show that the proposed algorithm of this research can neutralize the effect of the disruptions and cause a significant reduction in total cost of the system. The model is useful for helping decision makers to adopt an active approach to maintaining business benefits when disruptions take place in the supply chain. Keywords: Optimization model, Fuzzy, Auto parts supply chain, Disruption. Received: May 2018-30 Revised: January 2019-05 Accepted: February 2019-06 1. Introduction Iran's automobile industry turnover was $ 25 billion in 1395, including $ 16 billion in domestic production and $ 3 billion in imports of automobiles and related parts, and $ 6 billion in spare parts for after-sales services. (ISNA, 2017) The $ 6 billion annual volume of spare parts represents the position of this sector of the industry. Given today's competitive environment, supply chain management is essential in order to reduce costs, improve customer service and achieve a balance between costs and services, and thereby to give a competitive advantage to a company. * Corresponding author; dr.taghavifard@gmail.com 1 Faculty of Management & Accounting, Department of Industrial Management, Faculty of Management & Accounting, Allameh Tabataba’i University, Tehran, Iran. 2 Faculty member, Department of Industrial Management, Faculty of Management & Accounting, Allameh Tabatabai&rsquo University, Tehran, Iran. 3 Department of Industrial Engineering, Islamic Azad University, Qazvin Branch, Qazvin, Iran.