MCA方法在金属材料涂层性能研究中的应用

可移动元胞自动机(MCA)法是继有限元、边界元法之后又一种新的数值方法，它建立在不连续介质力学基础之上，可以直接模拟不均匀材料内部的损伤累积、裂纹扩展、碰撞能的计算等。本文介绍了MCA方法的理论基础及数学模型，通过一个金属基陶瓷涂层材料在冲击载荷作用下的损伤破坏计算实例表明，在同样条件下，双陶瓷涂层试样比单陶瓷涂层试样的抗冲击能力有明显提高，二者断口形貌和本构关系曲线也完全不同，说明涂层结构对涂层材料变形、损伤和破坏形式有重要影响，进而证明MCA方法可用来优化设计涂层结构与材料。

Application of MCA method on study of coating material properties

The Movable Cellular Automata (MCA) method is a new numeri cal analysis method following finite element method and boundary element method. It was established based on the discrete medium mechanics and allowed to simulate d irectly: damage accumulation, cracks propagation and crash energy calculation of the non-homogen eous material, etc. The relative theory and mathematical model of MCA was introd uced and derived in this paper, and a practical example of a beam with the three point bending of the metal matrix ceramics coating shows that the impact capaci ty of the specimen of double la yer coating is larger than that of the specimen of single layer coating under t he s ame condition. In the other hand, the fracture shapes of two specimens are disti nct, and the curves of stress vs. strain of both are distinguishable. The conclu sions can be drawn from this investigation that the deformation and failure mode s of coating materials are dependent on the structure of coating.