Failure mode of reinforcing steel mesh in aluminum roll bonded composite material

Abstract

Характер руйнування армувальної стальної сітки під час зварювання прокаткою композиційного матеріалу на основі алюмініюFlat roll-bonded aluminum 6060 composite materials with reinforcing steel inlets made of woven wire mesh (AISI 321) and expanded mesh (AISI 304) have been produced at 20 % and 30 % reduction. The roll bonding process has been performed at 400 and 500℃. After the process the composites were peeled and their interfaces were subsequently studied via SEM microscopy. In all cases the fracture of mesh inlets has been observed. The analysis of the failure mode has shown that the fracture of woven wire mesh corresponds to that described by other researchers. At the same time, the failure mode of expanded mesh inlet was presented in this study is characterized by a significant amount of brittle fracture at the region between strands and knuckles of expanded mesh. In order to analyze a stress state in these regions, the simulation using the finite element method (FEM) was set up by means of QForm software. The thermal and deformational conditions corresponded to experimental ones. It was shown that the von Mises stress reaches a significant magnitude up to the strength of austenitic steel. At the same time, a study of initial micro hardness of expanded mesh was conducted. The study revealed a significant work-hardening in the region of knuckles due to manufacturing procedure of expanded mesh and this seems to be the most important cause of destruction. In order to avoid such fracture, the annealing of expanded mesh was proposed. Presented results show a significant decrease of hardness and therefore an opportunity plastic deformation of expanded steel mesh.

Roll Bonding of Al-Based Composite Reinforced with C10 Steel Expanded Mesh Inlay

“…Therefore, it seems to be a better option for roll-bonded reinforced aluminum-based composites. The authors [8,9] studied the roll bonding process of a composite made of an aluminum alloy and AISI 304 steel expanded mesh. The mesh in the as-delivered state was rolled between two aluminum strips with a rolling reduction of 30% at 500 • C. The peel strength of the composites with a wire mesh inlay was superior to that of the expanded mesh, as the latter had a higher destruction rate.…”