压电式中低频原位疲劳测试装置的设计分析与试验研究

发布时间：2018-05-09 14:18

本文选题：原位测试 + 拉-拉疲劳　；参考：《吉林大学》2016年硕士论文

【摘要】：当前,材料制品应用广泛,材料的疲劳性能研究受到更多的重视。相应,人们对材料疲劳测试方法也提出了更高要求。现有疲劳测试方法大都是疲劳加载后的离位状态下,对材料微观组织形貌以及试件断口进行分析来解释其疲劳断裂机理,将材料微观组织形貌变化与宏观断裂失效建立动态联系的材料力学性能原位测试方法(In Situ)却研究甚少。针对目前国内外材料疲劳测试装置普遍存在的体积大、功能扩展能力差、兼容性差、价格昂贵等问题。本文基于材料原位测试技术,研制了一套小型化压电式中低频原位疲劳测试装置。本文开发的压电式中低频原位疲劳测试装置,具有较强的功能扩展能力和热电磁稳定性,与显微测试设备集成,能实现原位观测模式下中低频拉-拉疲劳加载,实时动态评价材料的疲劳断裂失效机理。本文主要工作内容如下:(1)通过对目前国内外疲劳测试装置的研究分析,研制了一套具有原位观测功能的疲劳测试装置,完成关键零部件设计,并在满足测试功能的前提下,对传感器、压电叠堆等优化选择,最终完成了装置制造和装配。(2)利用有限元分析软件ANSYS WORKBENCH分别对测试装置关键柔性铰链、装置整机、以及试件开展有限元仿真分析,验证柔性铰链以及整机的静、动态使用安全合理性并预测材料在不同疲劳工况下的疲劳寿命。(3)实现装置机械结构部分与电控部分的集成和调试,完成对力传感器和位移传感器的线性度测试和标定;完成因装置机架变形导致的力传感器和位移传感器结果参数误差的修正,并测试装置最终的静、动态输出性能。(4)使用本装置开展化学腐蚀下AZ41M变形镁合金原位拉-拉疲劳试验,探究材料在疲劳过程中的微观组织变化规律;开展不同类型缺口下1060铝的原位疲劳试验,探究疲劳工况下材料对缺口的敏感性;开展表面预制压痕缺陷下1:2型铜钢(H62黄铜-304不锈钢)复合材料常温下的原位疲劳试验并集成加热单元开展此类材料的热-疲劳耦合试验研究,探究温度对材料疲劳性能的影响。
[Abstract]:At present, materials and products are widely used, and more attention has been paid to the fatigue properties of materials. Accordingly, people also put forward higher request to material fatigue test method. In order to explain the fatigue fracture mechanism, most of the existing fatigue testing methods are based on the analysis of the microstructure and fracture surface of the material after fatigue loading. However, there is little research on in-situ testing method for mechanical properties of materials, which establishes dynamic relation between microstructure and macroscopic fracture failure. Aiming at the problems of large volume, poor function expansion ability, poor compatibility and high price, the domestic and foreign material fatigue testing devices are widely existed at present. Based on the in-situ testing technique, a miniaturized piezoelectric in-situ fatigue testing device for middle and low frequency was developed. The piezoelectric in-situ fatigue testing device with middle and low frequency is developed in this paper. It has strong functional expansion ability and thermal electromagnetic stability. It can be integrated with the micro-test equipment to realize the mid-low frequency tension and tension fatigue loading in in-situ observation mode. Real-time dynamic evaluation of fatigue failure mechanism of materials. The main work of this paper is as follows: (1) based on the research and analysis of domestic and foreign fatigue testing devices, a fatigue testing device with in-situ observation function has been developed to complete the design of key parts and components, and under the premise of satisfying the testing function, Finally, the fabrication and assembly of the device are finished. The finite element analysis software ANSYS WORKBENCH is used to simulate the key flexure hinge of the testing device, the whole device, and the test piece, respectively. To verify the safety and rationality of the flexible hinge and the static and dynamic use of the whole machine, and to predict the fatigue life of the material under different fatigue conditions, and to realize the integration and debugging of the mechanical structure part and the electronic control part of the device. The linearity of force sensor and displacement sensor is tested and calibrated, the error correction of the result parameter of force sensor and displacement sensor caused by the deformation of the frame of the device is completed, and the final static of the device is tested. Dynamic output performance. (4) using this device to carry out in-situ tensile and tensile fatigue tests of AZ41M wrought magnesium alloys under chemical corrosion, to explore the change of microstructure of materials during fatigue, and to carry out in-situ fatigue tests of 1060 aluminum under different types of notches. To explore the sensitivity of material to notch under fatigue condition; In-situ fatigue tests of 1:2 copper steel H62 brass 304 stainless steel composites with surface prefabricated indentation defects were carried out at room temperature. The thermal-fatigue coupling tests of these materials were carried out with an integrated heating unit to investigate the effect of temperature on the fatigue properties of the materials.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH871.3

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