随机振动下金属橡胶隔振器寿命影响因素分析及实验研究

发布时间：2018-12-09 18:13

【摘要】：金属橡胶以其耐高低温、不易老化、耐腐蚀等优良特性，成为航空航天、国防装备等领域普通橡胶的最佳替代品。金属橡胶隔振器已广泛应用于航空航天、国防装备等领域。随着金属橡胶隔振器应用的日益广泛，对其寿命及疲劳失效的研究也越来越迫切。揭示金属橡胶隔振器减振的内在机理,掌握其疲劳失效的一般规律,定量地预测其工作寿命,最大限度的避免金属橡胶因过早疲劳失效而造成重大损失,是相关研究领域的热点课题和瓶颈难题。本课题以××专项项目的具体需求为背景，以环形金属橡胶隔振器为研究对象，开展随机振动环境下金属橡胶隔振器寿命预测及其相关实验研究，分析金属丝直径、相对密度以及预变形对金属橡胶隔振器疲劳寿命的影响，，建立各主要影响因素的相互关系，探索金属橡胶隔振器的主要失效形式，建立寿命预测计算式。通过大量的疲劳寿命实验，构建了金属橡胶隔振器的疲劳寿命曲线。通过构建寿命预测模型，研究了基于单因素和多因素的寿命预测公式。通过大量实验数据验证了此寿命预测公式具有很大的参考价值，能在一定范围内预测金属橡胶隔振器的寿命。针对金属橡胶隔振器在不同应力水平下的失效状态，研究了具有不同金属丝直径的金属橡胶元件的微观形貌，通过对微观金属丝表面疲劳磨损和断口的研究，研究了金属橡胶元件的疲劳失效机理，提出金属橡胶的失效为：干摩擦失效和结构性疲劳失效。金属橡胶是一种各向异性的材料，为便于应用ANSYS等有限元软件分析，研究了环形金属橡胶隔振器的弹性模量和阻尼比。通过ANSYS的仿真研究，研究了在随机振动和静应力作用下金属橡胶元件内部应力和应变的变化，掌握了金属橡胶内部的受力情况。
[Abstract]:Metal rubber is the best substitute for common rubber in aerospace, national defense equipment and other fields because of its excellent properties such as high and low temperature resistance, aging resistance, corrosion resistance and so on. Metal rubber isolators have been widely used in aerospace, national defense equipment and other fields. With the increasing application of metal rubber isolators, it is more and more urgent to study their life and fatigue failure. The inherent mechanism of vibration absorption of metal rubber isolator is revealed, the general rule of fatigue failure is grasped, its working life is quantitatively predicted, and the heavy loss caused by premature fatigue failure of metal rubber is avoided to the maximum extent. It is a hot topic and bottleneck problem in related research fields. Based on the specific requirements of the 脳脳 special project and taking the ring metal rubber isolator as the research object, the life prediction of the metal rubber isolator under random vibration and its related experimental research are carried out, and the diameter of metal wire is analyzed. The influence of relative density and predeformation on the fatigue life of metal rubber isolator is discussed. The main failure forms of metal rubber isolator are explored and the calculating formula of life prediction is established. The fatigue life curve of metal rubber isolator is constructed by a large number of fatigue life experiments. The life prediction formula based on single factor and multiple factors is studied by constructing a life prediction model. A large number of experimental data show that this formula has great reference value and can predict the life of metal rubber isolator in a certain range. Aiming at the failure state of metal rubber isolator under different stress levels, the microstructure of metal rubber elements with different wire diameters was studied. The fatigue failure mechanism of metal rubber element is studied. The failure of metal rubber is presented as dry friction failure and structural fatigue failure. Metal rubber is an anisotropic material. The elastic modulus and damping ratio of ring metal rubber isolator are studied in order to facilitate the finite element analysis such as ANSYS. The variation of stress and strain of metal rubber element under random vibration and static stress was studied by ANSYS simulation, and the internal stress of metal rubber was grasped.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB535.1

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