Speaker
Description
Additive manufactured materials enable new possibilities in the construction of components by realizing complex geometries. One example of such materials is the aluminum alloy AlSi10Mg, that is manufactured by powder-based laser fusion and demonstrates a mechanical behavior comparable to conventionally processed materials. The manufacturing process results in an inhomogeneous structure that is characterized by voids. For the numerical description of aluminum alloy AlSi10Mg, a coupled thermomechanical Chaboche-Gurson-Tvergaard-Needleman (GTN) model is applied in this work. The model was implemented as a user material subroutine (UMAT) in the finite element software Abaqus. As a result, it enables a precise description of rate-dependent material behavior under consideration of damage mechanisms and establishes the fundamental framework for the development of innovative design methods.
The focus of the research is a numerical analysis of a complex riveted connection with AlSi10Mg joining partners. In the first step, the model parameters are determined based on static thermomechanical tests to describe the material properties under different loading conditions. The model is then transferred to a complex shear tensile test of the riveted connection for validation of the model and the basic methodology. A numerical analysis shows the potential of the coupled Chaboche-GTN model to describe additively manufactured components. This enables an optimized component design and provide important knowledge for the development of load-optimized connections in additively manufactured structures.
