複合材料彈性常數之識別

Abstract

本文以非破壞的方法來反求複合材料的材料性質，利用實驗應變值與理論應變值之誤差建立一誤差方程式，結合多起始點法與總域極小值法求得誤差方程式的極小值，藉此求出正確的材料性質。文中以反求積層板及積層式壓力容器之材料常數來驗證本法之正確性；並以本法求得纏繞式壓力容器之彈性常數。

A method for nondestructive evaluation of material properties of composite materials is presented. A multi-start algorithm for global constrained minimization is presented. In this algorithm the search trajectories are derived from the equation of motion of a particle in a conservative force field and the objective function which is the difference between the theoretically and experimentally predicted strains is treated as the potential energy of the particle. The applications of the proposed method are demonstrated by means of several examples on the identification of material properties of laminated composite plates, laminated composite cylindrical pressure vessels and filament wound composite pressure vessels.