碳纤维增强复合材料结构阻尼性能研究

Structural Damping Determination of Carbon Fiber Reinforced Composite

碳纤维增强复合材料的阻尼性能对所应用结构的动态承载能力、可靠性和安全性有重要影响。复合材料阻尼机理复杂,很难采用理论方法研究。本文基于瞬态激励法原理,设计了悬臂梁振动试验,利用有理分式多项式法提取试样的模态频率和模态损耗因子。分别对603和603A两种树脂基体,各三种T300纤维铺层方向的复合材料试样进行了振动测试,获得了材料1 kHz以内的动刚度和阻尼特性。结果表明,基体材料组分和纤维铺层方向对碳纤维增强复合材料的结构刚度和阻尼性能有重要影响;603A基体的碳纤维增强复合材料具有较603基体材料更好的损耗因子。铺层方向对结构阻尼的影响主要是通过对结构刚度的影响而体现出来的,不同纤维铺层方向的复合材料试样刚度差别很大。

Structural damping of carbon fiber reinforced laminate composite is experimentally determined using a cantilever beam test with an impulse excitation. Continuous carbon fiber reinforced laminates with different lamia orientation were fabricated from MT300/603 and MT300/603A to investigate the effect of matrix properties and fiber orientation on the damping of composite. The results show that the MT300/603A composite has a higher loss factor than MT300/603. Fiber orientation has an important effect on the modal frequency and modal damping and the effect is characteristic as changing structural flexibility. The 0° material exhibits a lighter damping loss factor than the other fiber orientation.