Investigation of the stress-strain state at the boundary between materials during rolling of a layered composite

Manufacturing of clad metal composites by rolling is becoming more widespread due to the advantages of products from composites. One of the key requirements for the quality of composites is the bond strength and reliability of the bond between materials acquired as a result of plastic deformation. As is known from the “film theory”, the ability of materials to bond is determined by the stress–strain state at the interlayer boundary, in particular, by the fracturing of oxide films and the convergence of clean surfaces of materials: the faster these processes occur during plastic deformation, the higher will be the resulting bond strength between layers of the finished product. In this study, an attempt was made to evaluate the stress–strain state at the interlayer boundary depending on the most significant technological factors - a combination of materials and a rolling schedule. Using finite element modeling, ductility indicator and effective strain depending on the ratio of the strength characteristics of the hard and soft components of composite and the distribution of reductions in rolling passes were studied. The revealed dependencies demonstrate a trend that determines favorable conditions for joining materials.The study was supported by the grant of the Russian Science Foundation No. 22-29-20243 "Multi-scale modeling of processes of joining dissimilar materials by plastic deformation" with the support of the government of the Sverdlovsk region.