回转窑托轮滚圈斜压接触的有限元分析

Finite Element Analysis of Oblique Multi-body Contact Between Roller and Tyre

建立了能精确反映托轮滚圈斜压接触的有限元模型,开发了一套完整的建立在混合标架下的托轮滚圈的三维接触有限元建模程序.应用接触问题的变分不等式解法,对托轮滚圈的斜压接触问题进行了有限元数值计算,得到了斜压接触下托轮与滚圈的应力及变形规律:托轮、滚圈的接触区是一个不完整的半椭圆,由接触中心沿椭圆长、短半轴方向,接触压力逐渐递减;滚圈回转一周,截面等效应力交变五次,这种周期性交变应力易导致滚圈开裂;在滚圈回转过程中,每一点的变形均呈现凹凸交变的复杂状态,从而迫使筒体的变形凹凸交变,严重时导致窑衬松动脱落.

The finite element model for contact analysis between roller and tyre under oblique contact status was established, the 3D contact finite element modeling program between roller and tyre under mixed coordinate was developed. Contaufinite element calculation of roller and tyre has been done by applying variational inequality for contact problems, the stress and deformation rule of roller and tyre under oblique contact status can be obtained ： The contant zone of roller and tyre is half an abridged ovality, the contact pressure is reduced gradually from the ellipse center to the long and short axes. The equivalent stress of tyre changes 5 times per circle, which will make trye fracture easily. Tyre deformation is in an altered status, which will make shell deformation change periodically, and even makes lining break down when the deformation is great.