To simulate the crack growth and study the catastrophic fracture mechanisms of metal films, a computational methodology is developed to simulate the failure process from damage initiation to crack growth and eventually to rupture. In the computational methodology, a procedure is developed based on beam lattice model for considering the coupling interactions among damage and crack evolution. To verify the effectiveness of the developed computational methodology, fracture process of two copper film specimens were simulated and compared with the corresponding experimental results. The results show that the developed methodology is effective, and can be used to simulate the catastrophic fracture process of metal films. From the simulation results, we can find out that the fracture of metal films with initial flaws belongs to brittle fracture, and the regular lattice model can affect the crack path prediction, and random and irregular lattice model is more suitable to simulate crack growth in the developed computational methodology.

为了模拟裂纹扩展并研究金属薄膜的灾难性断裂机制，开发了一种计算方法来模拟从损伤开始到裂纹扩展并最终破裂的失效过程。在计算方法中，开发了一种基于梁点阵模型的程序，用于考虑损伤和裂纹演化之间的耦合相互作用。为了验证所开发的计算方法的有效性，对两个铜膜试样的断裂过程进行了模拟，并与相应的实验结果进行了比较。结果表明，所开发的方法是有效的，可用于模拟金属薄膜的灾难性断裂过程。从模拟结果可以看出，具有初始缺陷的金属薄膜的断裂属于脆性断裂，