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利用ANSYS11.0,采用实体单元建模、线性强化的应力-应变关系和Von-Mises屈服准则,对焊接空心球节点进行弹塑性分析,采用弧长法跟踪球节点的荷载-位移曲线.首先利用试验数据验证了计算模型的正确性;然后对焊接空心球节点进行大量有限元分析,发现节点的荷载-位移曲线具有明显规律,并利用回归分析得出了与焊接球尺寸和偏心有关的屈服系数和刚度系数公式;接着利用正交设计方法,拟合所得数据,给出了与尺寸有关的焊接球节点初始轴向刚度和弯曲刚度公式;最后回归分析得到与尺寸和偏心有关的节点的极限承载力公式,从而最终确立了荷载-位移曲线的双线性模型.
With ANSYS11.0, solid-element modeling, linear-enhanced stress-strain relationship and Von-Mises yield criterion were used to analyze the elasto-plasticity of welded hollow ball joints and the arc-length method was used to track the load-displacement curves of ball joints. The experimental data verify the correctness of the calculation model. Then, a large number of finite element analysis of welded hollow ball joints are carried out. The load-displacement curves of the welded joints have obvious regularity. The yield coefficient And then using the orthogonal design method, fitting the obtained data to give the formulas of the initial axial stiffness and the bending stiffness of the size-dependent welded ball joints. Finally, the ultimate bearing capacity of the nodes related to size and eccentricity is obtained by regression analysis Force formula, which ultimately established a load-displacement curve of the bilinear model.