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为研究生物薄膜材料的疲劳行为及其机制,对其进行疲劳测试,利用压电振子作为疲劳试验机构的驱动力源,并基于系统共振方法设计了适用于昆虫薄膜材料的疲劳试验机构.首先,介绍压电驱动式疲劳试验机构的工作原理,然后建立动力学模型,获得机械系统的动态特性,并制作了样机.最后利用样机在蜻蜓翅翼上施加给定循环特性R=0.1的交变应力,通过对试验结果的观察,分析了蜻蜓翅翼由于疲劳破坏所引起的一系列裂纹产生、扩展的机理.制成的样机满足对生物薄膜材料进行疲劳试验所需的载荷小、加载精度高、共振稳定可靠和抗干扰能力强等要求.
In order to study the fatigue behavior of biofilm material and its mechanism, the fatigue test was carried out, the piezoelectric vibrator was used as the driving force source of fatigue test mechanism, and the fatigue test mechanism suitable for insect film material was designed based on the system resonance method.Firstly, The working principle of piezoelectric-driven fatigue test mechanism is introduced, then the dynamic model is established, the dynamic characteristics of the mechanical system are obtained, and the prototype is made.At last, a prototype machine is used to exert the alternating stress of R = 0.1 on the dragonfly wing Through the observation of the test results, a series of crack growth and propagation mechanisms of the dragonfly wing due to fatigue failure are analyzed.The prototypes made by this method satisfy the requirements of the fatigue test of bio-film materials with low load, high loading accuracy, Stable and reliable resonance and anti-interference ability and other requirements.