Multiscale Modeling of Joining Processes under Consideration of the Thermo-Mechano-Chemical Behaviour in the Interface

Abstract

In the last decades, manufacturing of layered composite materials has become an interesting topic in industrial development. Joining properties of adhesively bonded materials are characterized by a complex interaction of plastic deformation, thermo-mechano-chemical coupling effects, adhesion and diffusion. Additionally, the interactions between the microstructures involved in the process have to be taken into account. The design of new joining technologies requires a fundamental understanding of the mechanisms which is difficult to achieve by working solely experimentally. The present study therefore deals with modeling the essential effects characterizing joining. Additionally, special attention is paid to the experimental characterization of the involved materials at the macro and micro levels. The microstructure of materials (as e.g. AA1050, AA2024 and AA5754), which have a wide range of applications in engineering structures, is numerically and experimentally investigated. Moreover, a general cohesive zone element formulation in the framework of zero-thickness interface elements is developed. This enables the accurate and efficient modeling of the interface based on an interfacial traction-separation law.