疲劳-蠕变交互作用下挤压筒设计理论及寿命预测模型

发布时间：2018-05-19 15:09

本文选题：疲劳-蠕变 + 损伤　；参考：《机械工程学报》2017年16期

【摘要】：大型挤压筒长期在高温下承受循环高压的作用,疲劳-蠕变交互作用引起的筒体变形、开裂已成为挤压筒失效的主因,严重影响了挤压产品的生产效率和成本。着重研究疲劳-蠕变交互作用下的挤压筒服役寿命计算方法,通过对挤压过程下的复杂载荷边界条件建模,引入DDM方法分析多层挤压筒应力分布,并在此基础上通过试验获取挤压筒材料H13在服役温度下的疲劳和蠕变本构模型,通过逐步迭代计算疲劳、蠕变损伤与应力分布的演变,预测损伤累积到达临界值。提出的挤压筒疲劳蠕变寿命预测理论可为大型挤压筒设计提供新的准则,也可指导维修挤压筒修正各层筒间的过盈量和控制挤压生产工艺设计,以延长挤压筒整体的使用寿命。
[Abstract]:For a long time, the large extruding tube is subjected to the action of cyclic high pressure at high temperature. The deformation and cracking of the tube caused by the interaction of fatigue and creep have become the main cause of the failure of the extruding tube, which has seriously affected the production efficiency and cost of the extruded product. The service life calculation method of extruded cylinder under the interaction of fatigue and creep is studied emphatically. By modeling the boundary condition of complex load during extrusion, the DDM method is introduced to analyze the stress distribution of multi-layer extruded tube. On this basis, the fatigue and creep constitutive models of extruded tube material H13 at service temperature are obtained through experiments. The evolution of fatigue, creep damage and stress distribution is calculated step by step, and the cumulative damage reaches critical value is predicted. The prediction theory of fatigue creep life of extrusion tube can provide a new criterion for the design of large extrusion tube, and can also guide the maintenance of extrusion tube to correct the interference between different layers and control the extrusion production process design, so as to prolong the whole service life of the extrusion tube.
【作者单位】：重庆大学机械工程学院;重庆大学机械传动国家重点实验室;
【基金】：国家自然科学基金资助项目(51405044)
【分类号】：TG375

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