斜圈弹簧应力松弛的分析与计算及其测试装置的研究

发布时间：2018-06-24 03:07

本文选题：斜圈弹簧 + 应力松弛　；参考：《西安理工大学》2017年硕士论文

【摘要】：斜圈弹簧以其独特的结构特点和力学性能被广泛地应用于电力、密封、医疗及交通等领域。无论是以何种功能使用,斜圈弹簧都有着优于普通弹簧的性能。但是,斜圈弹簧在应用过程中长期处于高温压缩状态,必会产生应力松弛现象。然而,国内对斜圈弹簧的设计、制造、检测及失效预防等方面的研究还处于起步阶段。尽管已有学者刈对斜圈弹簧的应用范围、材料、制造工艺、热处理、电接触特性及力学性能等方面进行了研究,但对其应力松弛失效方面的研究较少。因此,对斜圈弹簧应力松弛现象的研究具有重要的理论和实用价值。斜圈弹簧应力松弛理论分析。首先,本文以微段斜圈弹簧为研究对象,将其简化为一端固定的当量悬臂梁,对其受力状态进行了分析。通过数值计算,推导出了斜圈弹簧径向力和变形的计算式,即刚度计算式,并利用有限元模拟仿真和简化的方法验证了计算式结果的准确性。其次,在刚度计算式的基础上,推导出了斜圈弹簧的应力计算式,其计算结果和ANSYS所得结果吻合较好;最后,根据应力松弛的基本含义,分析得到了斜圈弹簧应力松弛的理论计算式,并分析了应力松弛率对弹簧应力松弛的影响。斜圈弹簧应力松弛的ANSYS有限元仿真分析。建立了斜圈弹簧的数学模型,在此基础上,利用MATLAB及Pro/E软件建立了斜圈弹簧的有限元模型;求得了斜圈弹簧在载荷作用下应力的衰减情况;分析了环境温度对松弛行为的影响。此外,通过回归处理应力松弛曲线,得到了斜圈弹簧在不同环境温度下的松弛动力学方程,并由此推算出了斜圈弹簧在服役20年以后的应力损失率,为其寿命评判提供了可靠的依据。斜圈弹簧应力松弛测试装置的研究。通过分析不同类型的斜圈弹簧及应力松弛测试装置的主要技术指标和性能要求,确定了斜圈弹簧应力松弛测试装置的总体方案,并对其各个模块进行了设计,最后提出了斜圈弹簧应力松弛测试装置的结构设计方案。
[Abstract]:The oblique coil spring is widely used in electric power, sealing, medical treatment and transportation due to its unique structural characteristics and mechanical properties. No matter with any function, the oblique coil spring has better performance than the ordinary spring. However, the oblique coil spring is in the state of high temperature compression for a long time during the application, which will cause stress relaxation. However, the research on the design, manufacture, detection and failure prevention of oblique coil springs is still in its infancy. Although some scholars have studied the application range, material, manufacturing process, heat treatment, electrical contact characteristics and mechanical properties of oblique coil spring, there are few studies on stress relaxation failure. Therefore, the research on stress relaxation of oblique coil spring has important theoretical and practical value. Theoretical analysis of stress relaxation of oblique coil spring. Firstly, the micro-segment oblique coil spring is taken as the research object, which is simplified as an equivalent cantilever beam with one fixed end, and its stress state is analyzed. Through numerical calculation, the formula of radial force and deformation of oblique coil spring is derived, that is, stiffness formula, and the accuracy of the formula is verified by finite element simulation and simplified method. Secondly, on the basis of the stiffness formula, the stress calculation formula of oblique coil spring is derived, which is in good agreement with the result obtained by ANSYS. Finally, according to the basic meaning of stress relaxation, The theoretical formula of stress relaxation of inclined coil spring is obtained, and the effect of stress relaxation rate on stress relaxation of spring is analyzed. ANSYS finite element simulation analysis of stress relaxation of oblique coil spring. Based on the mathematical model of inclined coil spring, the finite element model of inclined coil spring is established by using MATLAB and Prop / E software, the stress attenuation of inclined coil spring under load is obtained, and the effect of ambient temperature on relaxation behavior is analyzed. In addition, the relaxation dynamic equation of oblique coil spring under different ambient temperature is obtained by regression treatment of stress relaxation curve, and the stress loss rate of oblique coil spring after 20 years of service is calculated. It provides a reliable basis for life evaluation. Research on stress relaxation testing device of oblique coil spring. By analyzing the main technical specifications and performance requirements of different types of oblique coil spring and stress relaxation testing device, the overall scheme of stress relaxation testing device for oblique coil spring is determined, and each module is designed. Finally, the structure design scheme of stress relaxation test device for oblique coil spring is presented.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH135

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