摘要
对设计制作的固支圆盘形金属橡胶构件进行疲劳损伤特性试验研究,对其疲劳损伤性能的分析表明金属橡胶材料的疲劳破坏不同于实体材料,它不会发生突然断裂失效,其疲劳破坏形式主要是其内部的金属丝产生局部断裂、破碎和磨损,从而在构件内部产生累积损伤,宏观上表现为承载能力和耗能性能不断衰减;通过对其内部金属丝两种典型勾连结构耗能方式随振动周期变化情况的分析,揭示金属橡胶材料疲劳损伤机理主要是其内部勾连结构滑移挤压方式的不同及金属丝间的微动摩擦、磨损及断裂;用刚度损伤和阻尼损伤描述金属橡胶的疲劳损伤过程,并提出综合损伤因子D作为金属橡胶疲劳失效判据。
The fatigue damage test of disk type metal rubber piece is performed.The results show that fatigue damage performance of metal rubber is different from conventional solid materials.The damage of metal rubber is accumulated with its inner partial wires wearing and fracturing,so it does not rupture as sudden failure of solid material.The load-bearing capacity and energy dissipation are tapered in macroscopic view.The fatigue damage mechanism of metal rubber material is revealed through analysis of the variation of energy dissipation modes of two typical linking structures of inner wires along with the vibration cycle,which is mainly the difference between the slip extrusion modes of inner linking structures and the fretting friction,wear,fracture of metal wires.The stiffness damage and damping damage are used to accurately describe the fatigue damage process of metal rubber,and the comprehensive damage factor D is proposed to be the fatigue failure criterion.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2011年第2期65-71,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(50775220)
关键词
金属橡胶
弹性多孔材料
疲劳损伤
微动摩擦
Metal rubber material Elastic porous material Fatigue damage Fretting friction
