Ma Zhichao, Zhao Hongwei, Li Qinchao, Wang Kaiting, Zhou Xiaoqin, Hu Xiaoli, Cheng Hongbing, Lu Shuai
College of Mechanical Science and Engineering, Jilin University, Changchun 130025, China.
Rev Sci Instrum. 2013 Apr;84(4):045104. doi: 10.1063/1.4798545.
For investigating the static tensile and dynamic fatigue behaviors of bulk materials, a miniaturized device with separate modular tensile and fatigue actuators was developed. The fatigue actuator presented good compatibility with the tensile actuator and mainly consisted of a special flexure hinge and piezoelectric stack. In situ fatigue tests under scanning electron microscope or metallographic microscope could be carried out due to the miniaturized dimensions of the device. A displacement correction method of tensile actuator based on load sensor compliance was investigated, and the feasibility of the method was verified by the comparison tests with a commercial tensile instrument. The application of testing the storage and loss modulus as a function of frequency was explained, and the temperature rises of both the piezoelectric stack and specimen were obtained as a function of frequency. Output characteristics of the fatigue actuator were also investigated. Additionally, the discharge performance of piezoelectric stack based on various initial voltages and fatigue tests on C11000 copper was carried out. This paper shows a modularized example that combines a servo motor with a piezoelectric actuator attached to the specimen grip to realize the in situ fatigue tests.
为了研究块状材料的静态拉伸和动态疲劳行为，开发了一种带有独立模块化拉伸和疲劳致动器的小型化装置。疲劳致动器与拉伸致动器具有良好的兼容性，主要由特殊的挠性铰链和压电叠堆组成。由于该装置尺寸小型化，可在扫描电子显微镜或金相显微镜下进行原位疲劳试验。研究了基于载荷传感器柔度的拉伸致动器位移校正方法，并通过与商用拉伸仪器的对比试验验证了该方法的可行性。解释了测试储能模量和损耗模量随频率变化的应用，并获得了压电叠堆和试样的温度随频率的升高情况。还研究了疲劳致动器的输出特性。此外，基于不同初始电压对压电叠堆进行了放电性能测试，并对C11000铜进行了疲劳试验。本文展示了一个模块化的实例，该实例将伺服电机与附着在试样夹具上的压电致动器相结合，以实现原位疲劳试验。
