Rahul, thanks for pointing me towards the additive manufacturing case studies for topology optimisation. However, the presentations do not specifically mention an approach to material anisotropy.
To build upon my previous post, I have found an academic paper which reports the mechanical properties of EBM and SLM Ti64. It was found that round tensile specimens exhibit a mean-average yield-strength only 3-5% greater in the horizontal orientation than in the vertical. On the other hand, I have found that the varying mechanical properties are much greater in processes such as fused deposition modelling. So my question is this - Since the mechanical properties of SLM/EBM do not significantly alter upon build direction, could the material be treated as isotropic during topology optimisation?
I'd be interested in knowing anybody's response to this.
P.S. For those who may be interested, the academic paper was entitled "Microstructures and Mechanical Properties of Ti6Al4V Parts Fabricated by Selective Laser Melting and Electron Beam Melting" by H.K. Rafi et. al.