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本文应用三维砖块八节点等参协调元(简称Q4元)和不协调元(称QM6元),对厚壁等径三通,在轴向推力与面内弯矩载荷作用下的弹性变形与应力分布进行了计算,得到了它们的变形与应力分布曲线,并进行比较。结果表明,用Q4元计算,在弯曲变形较大的区域,误差较大,反映不出三通的应力集中区的应力梯度高的特性,而QM6元则能较精确地计算出应力集中区的应力。
This paper applies the three-dimensional brick eight-node isoparametric coordinating element (Q4 element for short) and incoordination element (called QM6 element) to the elastic deformation of a thick-walled equal-diameter tee under axial thrust and in-plane bending moment loads. The stress distributions were calculated and their deformation and stress distribution curves were obtained and compared. The results show that in the Q4 element calculation, the error in the area with large bending deformation is large, the characteristics of the stress gradient in the stress concentration area of the three-way stress can not be reflected, and the QM6 element can accurately calculate the stress concentration area. stress.