Study on Co-evolution of Underload Failure and Overload Cascading Failure in Multi-layer Supply Chain Network

The supply chain network is closely related to our lives,and the cascading failure of the supply chain network has always been a hot research topic.This paper proposes a multi-layer supply chain network mixed failure model,which can better simulate the process of real supply chain network collapse and provide a reference for preventing supply chain network collapse.By establishing the supply chain network model of upper-level supplier network overload cascade failure and lower-level retailer network underload failure,the vulnerability of the supply chain network is studied when the upper and lower networks are attacked through different attack strategies.In the case of a certain initial attack ratio,the upper-layer supplier network is more robust than the lower-layer retailer network.Under the same attack ratio,the scale of the network crash when deliberately attacking network nodes is larger than that of random attacks.When the upper-layer supplier network node is initially attacked,the thresholdof network collapse is lower,which is more prone to collapse.This paper verifies the validity of the model and provides a new research model for preventing the collapse of the supply chain network