  One of the challenging issues in additive manufacturing (AM) oriented
topology optimization is how to design structures that are self-supportive in a
manufacture process without introducing additional supporting materials. In the
present contribution, it is intended to resolve this problem under an explicit
topology optimization framework where optimal structural topology can be found
by optimizing a set of explicit geometry parameters. Two solution approaches
established based on the Moving Morphable Components (MMC) and Moving Morphable
Voids (MMV) frameworks, respectively, are proposed and some theoretical issues
associated with AM oriented topology optimization are also analyzed. Numerical
examples provided demonstrate the effectiveness of the proposed methods.
