小试样高频弯曲疲劳试验装置的研制

发布时间：2018-07-04 19:03

本文选题：小试样 + 高频　；参考：《内蒙古农业大学》2016年硕士论文

【摘要】：据统计,在实际生活中很多工程事故大都是由于机器零部件或某些材料的失效所引起的,80%以上是因为疲劳破坏引起的失效。研究材料的疲劳性能对预测其疲劳寿命具有重要的意义,而获得材料疲劳性能的最直接手段是使用疲劳试验机对材料进行疲劳试验。但目前国内外的疲劳试验机的工作频率一般都不超过200Hz,而且不能对微小与脆性材料零件、高频受力构件的进行疲劳检测。因此,急切需要寻求一种新的途径解决这一问题。本文主要内容是对小试样高频弯曲疲劳试验装置样机的研制与测试过程,分析了当今疲劳试验机的研究现状,针对微小、脆性以及高频受力材料或零部件弯曲疲劳性能研究的需求,对新型弯曲疲劳试验原理进行模拟,并研制一部结构简易、操作方便的弯曲疲劳试验装置。旨在提高弯曲疲劳实验的频率,在短时间内取得微小与脆性材料零件、高频受力构件的弯曲疲劳数据。本文试验装置由三部分组成,包括机械装置、控制部分及测试元件。装置的核心部件是扬声装置,依靠扬声装置的振动对试样进行加载,试样主要进行悬臂弯曲疲劳试验。装置的振动频率和振动幅度通过控制调节函数信号发生器输出信号的周期和电压值来调节。各项数据借助精准的激光测试技术及示波器进行测量。其次,利用ANSYS有限元分析软件分析试样的应力应变,对试样进行了受力分析,在理论上解释了试样的弯曲疲劳特性。最后描述试样的加工处理过程及注意事项。在装置的试验测试过程中,装置可以稳定运行,各个系统可以正常工作。试样的运动与模拟结果一致,破坏大都集中在圆孔的两侧。这可以看出本次对疲劳试验原理的模拟比较成功,研制达到预期目标。
[Abstract]:According to statistics, many engineering accidents are mostly caused by the failure of machine parts or some materials. More than 80% of the accidents are caused by fatigue failure. It is of great significance to study the fatigue properties of materials to predict their fatigue life, and the most direct way to obtain the fatigue properties of materials is to use fatigue testing machine to carry out fatigue tests on materials. But at present, the working frequency of fatigue testing machine at home and abroad is not more than 200 Hz, and the fatigue detection of micro and brittle material parts and high frequency bearing components can not be carried out. Therefore, there is an urgent need to find a new way to solve this problem. The main content of this paper is to develop and test the prototype of high-frequency bending fatigue test device for small sample, and analyze the present research status of fatigue testing machine. For the study of brittleness and bending fatigue performance of high-frequency loaded materials or parts, the new bending fatigue test principle is simulated, and a simple and convenient bending fatigue test device is developed. The purpose of this paper is to increase the frequency of bending fatigue experiment and to obtain the bending fatigue data of small and brittle material parts and high-frequency mechanical components in a short time. The test device consists of three parts, including mechanical device, control part and test element. The key component of the device is the lifting device. The specimen is loaded by the vibration of the lifting device, and the specimen is mainly subjected to cantilever bending fatigue test. The vibration frequency and amplitude of the device are regulated by controlling the period and voltage of the output signal of the signal generator. The data are measured by accurate laser testing technology and oscilloscope. Secondly, the stress and strain of the specimen are analyzed by ANSYS finite element analysis software, and the bending fatigue characteristic of the specimen is explained theoretically. Finally, the processing process and points for attention of the sample are described. In the process of test and test, the device can run stably and each system can work normally. The motion of the specimen is consistent with the simulated results, and the damage is mostly concentrated on the two sides of the circular hole. It can be seen that the simulation of fatigue test principle is successful and the development achieves the expected goal.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH87

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