  This paper provides an orientation angle optimization method for the design
of fiber-reinforced composite materials using topology optimization. The
orientation angle optimization is based on a topological derivative, which
measures the sensitivity of an objective function with respect to a topological
change of anisotropic materials. The sensitivity is incorporated into a new
gradient-based optimization algorithm. This method allows us to avoid local
optima and seek a global optimal solution. We provide some numerical examples
and verify the effectiveness of the proposed method.

Computational Engineering, Finance, and Science;Optimization and Control