纤维复合材料的损伤韧度设计

DAMAGE MODELING AND TOUGHNESS DESIGN FOR FIBER COMPOSITES

文中以裂纹连续扩展的断裂力学方法，研究单向纤维复合材料的细观损伤演化与韧度计算。用基于有限元的数值方法模拟复合材料的多模式破坏过程，并计算复合材料在裂纹不同扩展路径下的有效韧度。研究表明界面的两个重要断裂参数（界面断裂能和混合度）是控制复合材料破坏模式与增韧机理的关键参数。提出了复合材料韧度设计的基本原理。

The methodology of fracture mechanics based on continuous crack growth was applied to the investigation of the microscopic damage evolution and toughness calculation for fiber composites. The multi mode failure processes were simulated by means of the finite element technique. The fracture energy and loading phase of the interface were taken as the essential microstructural parameters and the toughening mechanisms were discussed. A toughness design principle of fiber composites was developed.