电连接器接触件插拔特性数值计算与实验研究

发布时间：2018-05-28 15:13

本文选题：接触件 + 收口量　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：接触件作为电连接器的核心部件,接触磨损是导致接触件接触失效的主要原因,而插针与插孔之间的插拔常会导致磨损的发生。本文以航天电连接器中常用的直开槽片簧式接触件为研究对象,通过搭建接触件插拔实验系统,研究接触件收口量、插拔速度和水平偏移量对接触件插拔特性的影响规律。首先,基于非线性有限元仿真软件Abaqus,采用联合仿真的方法建立具有不同收口量的接触件有限元模型。在不同的收口量和水平偏移量的条件下,对接触件插拔特性进行仿真分析,得到了接触件的接触面积和接触压力的变化特性以及接触压力和等效应力的分布特性。其次,搭建电连接器接触件插拔实验系统,主要包括插拔力测量装置和接触电阻采集装置,可以对插拔速度和水平偏移量实现调节。选择三类收口的接触件进行插拔实验,得到了接触件的插拔力和接触电阻随插拔次数的变化规律。从微观角度分析表面粗糙度的变化是导致插拔力增大的主要原因,并且表面主要的磨损特征为犁沟和颗粒物。从理论角度分析了接触压力对接触件磨损率的影响。然后,基于实验研究了不同的插拔速度对接触件插拔特性影响,分析了插拔力和接触电阻随插拔次数的变化规律。结合磨损区域表面形貌和元素分析,归纳总结了接触件插拔时,接触表面存在的三种典型磨损形式为擦伤、颗粒物和堆积。根据接触件材料磨损率的变化,通过建立切线冲击碰撞磨损模型,得到了插拔过程中接触界面的材料的磨损特征。最后,根据接触件水平偏移特征,将水平偏移量划分为不同种。基于实验研究了接触件在不同的水平偏移量下对插拔特性的影响,分析了接触件插拔力和接触电阻随插拔次数的变化规律以及水平偏移量对接触件磨损率和插孔收口量的影响。并从微观角度总结了插针三种典型的磨损形式为犁沟、颗粒物和流动层叠。本研究方法和结论可为航天电连接器插拔工况下的电接触性能和机械性能的退化失效分析提供依据,从而提高电气和电子系统的可靠性。
[Abstract]:Contact wear is the main cause of contact failure as the core component of electrical connector, and the insertion and drawing between pin and socket often lead to wear. In this paper, the direct-slotted spring contacts commonly used in aerospace electrical connectors are taken as the research object. By setting up the contact plugging experiment system, the effects of the contact closing amount, the insertion speed and the horizontal offset on the insert characteristics of the contact are studied. Firstly, based on the nonlinear finite element simulation software Abaqus, the contact finite element model with different volume is established by the method of joint simulation. Under the condition of different inlet volume and horizontal offset, the contact area and contact pressure and the distribution of contact pressure and equivalent stress are obtained by simulation and analysis. Secondly, the electrical connector contact plug experiment system is built, which mainly includes the device for measuring the force of insertion and the device for collecting contact resistance, which can adjust the insertion speed and horizontal offset. The insertion force and contact resistance of three types of contacts are obtained by the experiment of inserting. The change of the contact force and contact resistance with the number of inserts is obtained. The change of surface roughness is the main reason for the increase of the pull-out force, and the main wear characteristics of the surface are ploughing and particulate matter. The influence of contact pressure on the wear rate of contact is analyzed theoretically. Then, based on the experiments, the effects of different plugging speeds on the plugging characteristics of the contact are studied, and the variation of the insertion force and the contact resistance with the number of insertions is analyzed. Based on the surface morphology and elemental analysis of the wear area, three typical wear forms of contact surface were summarized, such as abrasion, particulate matter and accumulation. According to the wear rate of the contact material, the wear characteristics of the contact interface during the process of insertion are obtained by establishing the tangent impact wear model. Finally, the horizontal offset is divided into different kinds according to the feature of horizontal migration. Based on the experiments, the influence of the contact on the plugging characteristics under different horizontal deviations is studied. The variation of the contact insertion force and contact resistance with the number of inserts and the influence of the horizontal offset on the contact wear rate and the socket size are analyzed. The three typical wear patterns of the pin are plow, particle and flow stratification from the microscopic point of view. The methods and conclusions of this study can provide a basis for the degenerative failure analysis of electrical contact and mechanical properties of aerospace electrical connectors under the condition of plugging, thus improving the reliability of electrical and electronic systems.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM503.5

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