结合部法向黏弹性性质及有限元模型

发布时间：2018-06-25 00:10

  本文选题：法向 + 接触　； 参考：《机床与液压》2017年19期

【摘要】：通过试验研究了铸铁结合部在法向阶跃激励下的变形响应规律,发现阶跃响应曲线存在明显的瞬时弹性部分和持续时间较长的、渐变的黏性部分,并且在不同激振幅值和预紧力作用下,黏性部分大约是总变形的1/3,并且保持不变,这些现象无法用结合部建模中经常采用的Kelvin-Voigt模型反映,为此提出了一种新的结合部法向特性的建模方法。首先介绍了研究采用的试验原理和试验装置,分析了结合部在阶跃激励下的变形响应特点,研究了Kelvin-Voigt模型和黏弹性分析中常用的三元件模型在结合部建模中存在的问题,在此基础上将三元件模型加以改造,提出一种适合结合部建模的四元件模型。最后将该模型的阶跃响应与试验结果进行了比较,结果表明提出的模型能更准确地反映结合部法向的黏弹性性质。
[Abstract]:The deformation response of cast iron joint under normal step excitation is studied. It is found that the step response curve has obvious instantaneous elastic part and long duration and gradual viscosity part. And under the action of different exciting amplitude and pretightening force, the viscosity part is about 1 / 3 of the total deformation and remains unchanged. These phenomena can not be reflected by Kelvin-Voigt model, which is often used in joint modeling. In this paper, a new modeling method for the normal characteristic of joint is proposed. Firstly, the experimental principle and experimental device used in the study are introduced, and the characteristics of deformation response of the joint under step excitation are analyzed, and the problems of Kelvin-Voigt model and the three-element model commonly used in viscoelastic analysis in the joint modeling are studied. On this basis, the three-element model is modified and a four-element model suitable for joint modeling is proposed. Finally, the step response of the model is compared with the experimental results. The results show that the proposed model can more accurately reflect the viscoelastic properties of the joint in normal direction.
【作者单位】： 西安职业技术学院电子信息工程系;西安理工大学机械与精密仪器学院;
【基金】：国家重点基础研究发展计划(2009CB724406) 国家科技重大专项(2009ZX04014-032) 西安理工大学科技创新计划(102-210916) 陕西省教育厅科学研究计划(08JK393)
【分类号】：TB115;TG502
，

本文编号：2063614