Fluid behavior control on die casting process by optimization of plunger tip shape based on practicable damage estimation algorithm

It is general to evaluate strength of a structure by the strain and the stress obtained by using the finite element method. The strong shape can be derived for an over load when these evaluations are used. However, it is not an enough evaluation if it thinks from the viewpoint used in a mid/long term. In this paper, we propose the damage estimation algorithm which estimates the damage of the structure by using the structure analysis and the linear cumulative damage law. Finally, this proposal method is develop to the optimization problem and we construct the optimization method of practical use which can design strong shape corresponding to cumulative fatigue while estimating damage. The effectiveness of this proposal method is shown by applying to the shape optimization problem of the plunger tip in the die-cast process.