豆粉压力喷雾干燥机壳体弹塑性应变强度研究

Study on elastic and plastic strain strength for housing of flour pressure spray dryer

对YPG-22500压力喷雾豆粉干燥机的薄壁壳体建立轴对称薄壳模型,列出基于薄壳理论的弹塑性变形下能量法的典型方程,给出应变强度与变形刚度的计算方法和条件;根据假设壳体两端固结的边界条件和循环疲劳的工作环境及材料折线硬化的实际情况,利用计算机对典型方程进行逐次积分,求得符合精度要求的数值逼近解和关键参数曲线,得到与试验结果极为接近的结论;并指出无量纲变量u-(ε-)对薄壳的几何参数和薄壳两端位移的比率没有太大关系。更为合理地解决了压力荷载下的大型薄壳容器工业设计的弹塑性应变强度和挠度计算问题。

The axisymmetric thin walled housing model for the thinwalled housing of YPG-22500 flour pressure spray dryer was established,and the typical equation of energy method based on the thinwalled housing theory under the elastic-plastic deformation was listed,and the calculation method and condition on strain strength and deformation stiffness were also given.According to the assuming boundary condition on both ends of the housing and to the working environment of cycle fatigue and to the actual situation of materials line hardening,integrated the typical equation successively by the computer to obtain the numerical approximate solution matched the requirement and the key parameter curve,the conclusion which was very closed to the experimental results.That the ratio of the dimensionless variables u^-（ε^-）had little affection on the ratio of geometry parameters of the thin-walled housing and displacement between the both ends of it was pointed out in the paper.The problem of Elasticplastic strain strength and the deflection calculation which were met in the industrial design of large thin-walled housing vessels under the pressure load was more reasonably solved.