Sharif Digital Repository

The fiber-reinforced composite materials are used widely because of their high strength-to-density and stiffness-to-density ratios. The laminated composites are susceptible to delamination. When a delaminated composite plate is subjected to in-plane compression, buckling in the delaminated region may occur. In this thesis, after verification and validation of the models, the effect of the length of the longest and near surface delamination and beneath delaminations on critical buckling load of composite laminates are investigated. Numerical study is carried out to determine the buckling load of clamped composite plates with different symmetric and anti symmetric stacking sequences. The... 

Today, with the expansion of business relations at international levels, there are many organizations that operate in global supply chains. Activities at such levels face new types of challenges in various fields of "supply chain management" pillars, of which "supplier selection" is one of them. The possibility of unexpected events, the need to comply with environmental protection laws, as well as the need to take into account social considerations, are among the things that have increased by being in larger supply chains, making it challenging to provide the basic resources needed in such chains and forcing their managers to considering considerations other than what they have always...