Today’s social and ecological conditions require extensive efforts to facilitate the efficient use of energy and resources. Regarding these circumstances, design criteria of technical products consider the possibilities of consequent lightweight construction and smart structures. Both approaches lead to hybrid components consisting of different materials. A sound combination of these materials offers excellent properties regarding functionality, mass density, safety and consumption of energy and resources. Joining techniques based on plastic deformation of at least one component offer great potential for a Reduction in the use of energy and natural resources to produce multi material joints. Though, a substantial gap of knowledge exists regarding the joining techniques, their design, destructive and non-destructive testing methods and the specific characteristics of the particularly relevant joining mechanisms.
The priority program aims for an interdisciplinary gain of knowledge regarding the underlying mechanisms in the processes of joining by plastic deformation as well as methods for the design of both joining processes and joint properties. The enhanced knowledge of the joining mechanisms is supposed to lead to the design of new or improved joining techniques, design criteria for joints, new products and to an extended use of hybrid components in modern products. The overcoming of the mentioned deficits in existing processes and the development of joining techniques are focused by this priority program. Knowledge gaps exist regarding the joining mechanisms, the achievement of the required plastic strain of hardly formable or brittle materials, the predictability of the joint strength with theoretical models and the field of nondestructive testing of the joints. In order to fill these gaps, developments on the fields of forming, measuring and controlling engineering, plastic mechanics, chemistry and mathematics are to be linked within this program.