Development Of High-frequency Small Specimens Bending Fatigue Test Device

According to statistics, in our real life, many large projects are due to accidents or failure of the machine parts caused by certain materials, more than 80% fail because of fatigue damage caused. The most direct means of research on fatigue properties is of great significance for predicting the fatigue life, and access to material fatigue properties is the use of material fatigue testing machine for fatigue tests. But at present, the working frequency of fatigue testing machine at home and abroad is generally not more than 200Hz, and can not be on the micro and brittle material parts, high frequency stress components for fatigue detection. Therefore, it is urgent to seek a new way to solve this problem.The main content of this article is to develop and test a small sample high frequency bending fatigue test device, analyzes the research status of today’s fatigue testing machine. For small, brittle and high-frequency force materials or components bending fatigue research needs of performance, the new bending fatigue test principle simulation, and the development of a simple structure, easy to operate bending fatigue test device Aimed at improving the bending fatigue test frequency to obtain fine and brittle material parts in a short time, high-frequency data bending fatigue stress member. In this paper, the test device consists of three parts, including mechanical means, and the control section test element. Core components of the device is a speaker device, relying vibration speaker apparatus for loading samples, samples mainly cantilever bending fatigue test. The vibration frequency and the vibration amplitude of the device can be adjusted by controlling the period and the voltage value of the output signal of the function signal generator. The data using the precision of the laser sensor and oscilloscope measurementSecondly, the use of ANSYS finite element analysis software to analyze the stress and strain of the sample, the sample is a mechanical analysis, theoretically explained bending fatigue properties of the sample. Finally, describe the processing procedure and precautions specimen.During the test and test of the device, the device can run stably, and the system can work normally. The movement of the sample is in agreement with the simulation results. Most of the damage is concentrated on both sides of the round hole. This can be seen in the fatigue test of the principle of simulation is more successful, developed to achieve the desired objectives.