A new topology optimization approach based on Moving Morphable Components (MMC) and the ersatz material model

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Topology optimization with multiple materials via moving morphable component (MMC) method (2018, unknown): “λ ·∇ u(1)−u(2) ·n 1⁄4 − σ(1) ·n · ∇u(1) ·n − σ(2) ·n · ∇u(2) ·n : (24)”
A new isogeometric topology optimization using moving morphable components based on R-functions and collocation schemes (2018, methodology): “The initial design of rectangular components is same as that in [27], and it depicts two initial designs for the cantilever beam in Fig.”
Explicit three dimensional topology optimization via Moving Morphable Void (MMV) approach (2017, methodology): “As pointed out in [20, 32], in this approach, the stiffness matrix of the ee-th finite element is calculated as KKee = � BBDDeeBB Ωee dV, (9)”
Geometric constraints for shape and topology optimization in architectural design (2017, methodology): “by means of a computational mesh, as in [5, 22, 51], or by a set of simple primitives [37, 69].”