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螺纹联接松动机理研究

发布时间:2018-01-04 07:21

  本文关键词:螺纹联接松动机理研究 出处:《北京理工大学》2015年博士论文 论文类型:学位论文


  更多相关文章: 螺纹联接 松动 棘轮效应 数值仿真 温度变化


【摘要】:螺纹联接是最常用的紧固手段之一,在传递力(或力矩)、保证密封结构密封性等方面具有至关重要的作用。而松动作为主要失效形式之一,虽然并没有在失效的初始阶段便引起重大事故,但是在其失效的进行过程中,螺栓张紧力会越来越低,,由此导致的诸如泄漏、异响等结构故障也是不容忽视的。因此,研究螺纹联接的松动机理具有重要的工程应用及理论价值。本文围绕螺纹联接松动机理展开研究,主要包括以下四个方面的内容: 1)采用基于Ziegler随动强化准则的混合强化模型,研究了以较大预紧力预紧的螺纹联接在其松动初始阶段由于材料的棘轮效应导致的张紧力下降以及相关影响因素的影响规律。 2)通过分析螺栓螺纹面的数学表达,提出了螺纹联接的参数化有限元建模方法。随后对螺纹联接由接触状态变化而产生的张紧力下降展开研究,分析了松动过程中接触状态的变化以及相关的影响因素的影响规律,揭示了这一阶段螺栓松动的机理。 3)对于温度引起的螺纹联接的塑性变形及蠕变,本文在考虑材料属性随温度非线性变化的同时,将螺栓分为光杆段及螺纹段,建立了可以反映螺栓张紧力、应力应变状态随循环温度变化的一维数学模型。该一维模型可以与有限元计算结果较好的吻合。 4)分析了温度变化所引起的螺纹各构件的相对运动形式。率先研究了螺纹联接径向热膨胀所引起的联接中的相对运动。通过适当的假设,建立可以反映具有矩形螺牙的螺纹联接在温度循环变化过程中螺栓张紧力、螺栓转动角度、摩擦力及力矩变化规律的数学模型,并以此研究了若干影响因素的影响规律。
[Abstract]:Thread connection is one of the most commonly used means of fastening, which plays an important role in transmitting force (or torque) and ensuring sealing ability of sealing structure. Loosening is one of the main failure forms. Although it does not cause serious accidents in the initial stage of failure, bolt tension will become lower and lower during the process of failure, resulting in such as leakage. Therefore, it has important engineering application and theoretical value to study the loosening mechanism of thread connection. It mainly includes the following four aspects: 1) A hybrid reinforcement model based on Ziegler agitation enhancement criterion is adopted. In the initial stage of loosening, the tensioning force of thread joints with large pretightening force is decreased due to the ratchet effect of the material and the influence of related factors is studied. 2) by analyzing the mathematical expression of bolt thread surface, a parameterized finite element modeling method of thread connection is put forward. Then, the tension reduction caused by the change of contact state of thread joint is studied. The change of contact state in the process of loosening and the influence of related factors are analyzed, and the mechanism of bolt loosening in this stage is revealed. 3) for the plastic deformation and creep of thread connection caused by temperature, the bolt is divided into bare rod section and thread section, which can reflect the tension force of bolt, considering the nonlinear variation of material properties with temperature. The one-dimensional mathematical model of stress-strain state varying with cyclic temperature is in good agreement with the result of finite element calculation. 4) the relative motion of thread components caused by temperature change is analyzed, and the relative motion in the connection caused by radial thermal expansion of thread connection is studied firstly. The mathematical model of bolt tension, bolt rotation angle, friction force and torque change in the process of temperature cycle change of thread connection with rectangular screw tooth is established. Based on this, the influence law of several influencing factors is studied.
【学位授予单位】:北京理工大学
【学位级别】:博士
【学位授予年份】:2015
【分类号】:TH131.3

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