SFP—a new parameterization based on shape functions for optimal material selection: application to conventional composite plies

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Material interpolation schemes for unified topology and multi-material optimization (2011, methodology): “Right: SFP solution from Bruyneel (2011) evaluated using our code”
A new multi-material level set topology optimization method with the length scale control capability (2018, unknown): “Later, several modified multi-orientation interpolations were proposed such as the Shape Function with Penalization (SFP) [16,17] and the Bi-value Coding Parameterization (BCP) [18,19], which demonstrated the advantages of reduced design variables.”
General topology optimization method with continuous and discrete orientation design using isoparametric projection (2015, background): “Note that unlike DMO or their variants [9, 34], the number of design variables is independent of the number of angle options (i.”
An improved soft-kill BESO algorithm for optimal distribution of single or multiple material phases (2015, background): “For other notable recent works in this area, the reader is referred to the works of Gao and Zhang (2011); Bruyneel (2011); Blasques and Stolpe (2012); Gao et al (2013); Tavakoli and Mohseni (2014); Tavakoli (2014); Park and Sutradhar (2015); Querin et al (2015).”