摘要
以高低温等太空极端环境中的减振需求为背景,对设计制作的固支圆盘型金属橡胶试件进行了高低温环境疲劳特性试验研究,并根据刚度衰退特性提出了金属橡胶构件的疲劳失效判据。研究结果表明:金属橡胶材料的疲劳破坏形式主要是金属丝的断裂破碎和磨损,宏观上表现为试件动态刚度的不断衰减,且在相同振幅下,金属橡胶试件的刚度衰减速度随环境温度的降低而加快,随温度的升高而减缓。在整个疲劳试验过程中,试件损耗因子变化幅度较小,阻尼性能相对比较稳定。
To meet the need of reducing vibration in space environment such as high ＆ low temperature, the clamped-edge disk type of metal-rubber specimen is designed and the experimental research on its fatigue characteristics at high ＆ low temperature is performed. A fatigue failure criterion of this type of metal-rubber structural components based on the stiffness degradation characteristics is proposed. The experimental results show that the main fatigue failure form of the clamped-edge disk type of metal-rubber specimen is fracture and severe wear of the wires, which exhibits the degradation of the specimen＇s dynamic stiffness in macroscopic view. And the specimen＇s stiffness degradation becomes faster at lower temperature and slower at higher temperature under the same oscillating amplitude. The loss factor of metal-rubber material, which is insensitive to ambient temperature, is relatively stable in the whole courses of the fatigue experiments.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2007年第2期77-80,共4页
Aerospace Materials & Technology
基金
总装重点基金项目
金属橡胶材料高/低温条件下耗能理论与制备技术研究(批准号:6140420)
关键词
金属橡胶
弹性多孔材料
高低温环境
疲劳特性
刚度衰退
累积损伤
Metal-Rubber, Elastic porous material, High ＆ low temperature, Fatigue characteristics, Stiffness degradation, Cumulative damage
