【摘要】 利用非线性弹性材料对多层圆柱结构进行接触预紧 ,涉及到几何非线性和材料非线性以及接触面上摩擦力的影响。当材料间刚度差别较大时 ,刚度低的材料呈现大变形特征 ,加大了几何非线性的程度。结构内部预紧力的大小和分布与结构的整体刚度、结合部位的局部刚度、过盈配合程度、接触面积等因素有关。本文对以橡胶作为预紧垫层的双层金属柱体的预紧过程进行了力学实验和数值模拟。预紧后的模型受中心集中力的作用 ,以得到橡胶垫层在复杂载荷作用下的状况。在数值模拟模型中 ,接触面采用直接约束模型 ,摩擦力的模拟选用库仑摩擦模型 ,预紧力的施加与力学实验模型相同 ,利用两个金属半圆环逐步压紧橡胶材料。数值模拟结果和实验数据吻合较好 ,表明结构非线性大变形接触预紧模拟的数值模型是合理的。更多还原

【Abstract】 Using a nonlinear and elastic material to pre tighten a multi layer cylindrical structure concerns the effects of the geometrical and material non linearity and also the friction between the contact surfaces. When the hardness of the materials in the structure is very different, the low hardness material presents high deformation and increases the level of the geometrical non linearity. The level and distribution of the pre stresses are influenced by the general and local stiffness of the structure, the contact area and the press degree. In this paper, a mechanical test and a numerical simulation are carried out on a cylindrical structure of two layer metals pressurized by rubber. Then, this structure is subjected to a concentrative load situated at the center and the behavior of the rubber layer is obtained under the complete stress condition. In the numerical modeling, the direct contact model and the friction model of Coulomb are used. Using two half ring to press the rubber layer and finally fix the structure is the same process in both experiment and numerical simulation. The results of the simulation agree with the experimental data. It seems that the numerical model is valid to simulate the contact pressurized structure with nonlinear and high deformation.更多还原