A bio-inspired B-Spline Offset Feature for structural topology optimization

In this paper, we propose a B-Spline Offset Feature (BSOF) for feature-driven topology optimization. The feature is inspired from the geometric morphology of worms characterized by an elongated cylindrical, bilaterally symmetric, and well-segmented body along highly deformable directrix. B-spline used to define directrix with its outward inward offsets outlining BSOF. This definition endows BSOF high deformability such as self-folding self-intersection. To construct implicit level-set function (LSF), decomposed into sequence segments whose LSFs can easily be constructed Kreisselmeier–Steinhauser (KS) function. Regular or irregular shaped are identified deformation gradient. Irregular involving geometrical singularities, e.g. distorted concave segments, replaced convex hulls. stiffest structure design compliant mechanism synthesis studied illustrate effectiveness advantages proposed