Research development of fatigue life prediction and damage analysis model of fiber-reinforced composite
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摘要:
随着纤维增强复合材料主承力结构在多领域内的广泛应用，疲劳成为复合材料结构设计必须面对的问题，出现了大量用于复合材料结构疲劳寿命预测及损伤演化的分析模型与方法。目前的复合材料疲劳性能分析模型可以分为疲劳寿命模型、唯象模型和渐进损伤模型。对这3类模型的发展情况进行了综述和对比分析。其中，疲劳寿命模型原理相对简单，适用于工程结构的寿命估算；唯象模型建立了材料剩余强度/刚度与循环数的数学关系，可以预测结构的寿命与材料剩余力学性能；渐进损伤模型不仅可以预测结构寿命和材料剩余力学性能，还能分析结构疲劳损伤机理。对各类疲劳性能分析模型的发展趋势进行了讨论。指出了降低实施成本和提高通用型是各类疲劳性能分析模型有待解决的问题。
Abstract:With the wide application of fiber-reinforced composite primary structures in many fields, fatigue has become a critical problem in composite structural design and analysis. Based on the development of fatigue theory of composite materials, many theoretical methods and numerical models for life prediction and damage analysis have been proposed by scholars. The current composite fatigue performance analysis models can be classified as fatigue life model, phenomenological model and progressive damage model. The development of these three kinds of models is reviewed and compared and their advantages and disadvantages are analyzed. The theory of fatigue life model is relatively simple, and the model is suitable for the life estimation of engineering structures. The mathematical relationship between residual strength/stiffness and fatigue cycle number is established in phenomenological model, which can predict the structure fatigue life and material residual mechanical properties. The progressive damage model can not only predict the structure fatigue life and material residual mechanical properties, but also analyze the fatigue damage mechanism of structures. Finally, the development trends of these fatigue performance analysis models are discussed. It is pointed out that reducing the implementation cost and improving the generality are important problems of these models.
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Key words:
- composites /
- fatigue /
- life prediction /
- phenomenological models /
- progressive damage
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图 6 Shokrieh渐进损伤模型运行流程
Figure 6. Operation flowchart of Shrokrieh's progressivedamage model
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