The selective laser melting process has already been developed for many metallic materials, including steel, aluminum, and titanium. The quasi-static properties of these materials have been found to be comparable or even better than their conventionally manufactured counterparts; however, for their reliable application in operational components, their fatigue behavior plays a critical role. This phenomenon is dominated by several process-related features, like surface roughness, remnant porosity, microstructure, and residual stresses, which are controlled by the processing features such as imparted energy density to the material, its corresponding solidification behavior, the cooling rate in the process, as well as post-processing treatments [1]. The experimental study is followed by simulations relying on an assumption for the Helmholtz free energy and the dissipation potential. To be more precise: the phase-field method is applied to simulate the damage evolution, whereas plastic effects are modeled in terms of isotropic and kinematic hardening [2]. It is assumed that the damage evolution only occurs in the tension phase of a cyclic load, which is achieved by the decomposition of the stored energy. Finally, numerical results compare the evolution of plastic deformations and of the damage as well as their interaction.

REFERENCES
[1] Siddique, S., Awd, M., Wiegold, T., Klinge, S. and Walther, F., Simulation of cyclic deformation behavior of selective laser melted and hybrid-manufactured aluminum alloys using the phase-field method. Appl. Sci., (2018) 8 (10), 1948: 1‚Äì18.
[2] Klinge S., Ayg√ºn, S. and Wiegold T., Coupling of the phase field approach to the Armstrong-Frederick model for the simulation of ductile damage under the cyclic load. Int. J. Plast. (submitted).


Experimental investigation and numerical simulation of cyclic deformation behavior of SLM-manufactured aluminum alloys

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