复合材料层压板疲劳损伤演化模型的综述与评估

Review and Evaluation of Fatigue Damage Evolution Models for Composite Laminates

疲劳损伤演化模型是材料疲劳性能退化与寿命预测的重要基础。本文对复合材料层压板的疲劳损伤演化模型进行了全面综述,针对材料损伤演化三阶段(Ⅰ、Ⅱ、Ⅲ)特征将其磨损模型分为两类:Ⅰ-Ⅱ-Ⅲ三阶段模型和Ⅰ-Ⅱ两阶段模型。提出了模型评估的五个基本标准,选取了八组不同加载条件下的疲劳损伤演化实验数据,对表征能力较强的疲劳磨损模型进行了分析评估。现有研究表明:绝大多数疲劳损伤演化模型属于宏观唯象模型,模型中引入的疲劳影响因素少,对实验的依赖程度高;对于Ⅰ-Ⅱ两阶段损伤,两阶段磨损模型具有很高的拟合精度;相比而言,Ⅰ-Ⅱ-Ⅲ三阶段磨损模型可准确模拟疲劳损伤演化全过程,比Ⅰ-Ⅱ两阶段磨损模型更具普适性,其中Mao、吴富强和Shiri的模型应用较为广泛。为了克服唯象模型的不足,须考虑不同影响因素下材料的微细观损伤形式和机理,进而发展基于物理机制的疲劳损伤演化理论和模型。

Fatigue damage evolution model is of great importance for predicting property degradation and fatigue life of materials.In this paper,a comprehensive review of fatigue damage evolution models for composite laminates is presented,and according to the three-stage(Ⅰ,Ⅱ,andⅢ)characteristics of the fatigue damage evolutions,the wear-out models are divided into two categories,i.e.,Ⅰ-Ⅱ-Ⅲthree-stage models andⅠ-Ⅱtwo-stage models.In order to validate and evaluate the selected models with relatively strong characterization ability,five basic criteria for model evaluation are suggested,and eight groups of experimental data on fatigue damage evolution under different loading conditions are adopted.The investigation show that most of the fatigue damage evolution models developed so far are recognized as macroscopic and phenomenological ones,which consider few influencing factors and rely heavily on experiments.For stages I and II,the two-stage wear-out models show high fitting accuracy.But in comparison,the three-stage wear-out models are more applicable than the two-stage ones,for their accurate simulation of the whole damage evolution process.While among those three-stage models,the Mao,Wu Fuqiang and Shiri models are more extensively cited and applied.To overcome the drawbacks of the phenomenological models,it is necessary to consider the microscopic damage modes and mechanisms under different influencing factors,and to develop physical-based fatigue damage evolution model and theory.