本科毕业设计-基于ansys的重轨淬火温度场和应力场仿真分析.doc

本科毕业论文（设计） 论文题目： 基于ANSYS的重轨淬火温度场和应力场仿真分析 摘 要 本文以规格为50kg／mANSYS软件，采用有限单元法，建立了淬火重轨的瞬态温度场和应力场的三维模型。通过ANSYA软件仿真淬火重轨各个时间段的温度场。根据重轨温度场的变化规律，选择合理的喷风压强，最终得到理想的索氏体组织。 在数值模拟计算的过程中，输入在不同的喷风压力下的对流换热系数，得到相应的温度场和应力场结果，并对结果进行了分析。计算了强制冷却、空气自然对流等淬火过程的温度场和应力场分布情况，分析淬火时间对温度场和应力场的影响。得到最佳的喷风冷却时压强，从而为实际生产制定合理的重轨淬火工艺提供了依据。 关键词：重轨，淬火，温度场，应力场，ANSYS Simulation of quenching temperature field and stress field for heavy rail based on the ANSYS Abstract The specification of 50kg／m—heavy rail was taken as investigated subject in this paper． In this model．the equivalent thermal capacity method was used to deal with the influence of latent heat on temperature filed and the transfmation stress which resulted from phase transformation was taken into account using the equivalent linear expansion coefficient method．The impact of material’s non-1inear parameter on temperature field was considered．The results show that the simulation result is identical with the measuring temperature． According to the distribution of temperature field，the time of compressed air should be controlled．The ideal sbite can be gained． During the process of calculating in numerical simulation，inputed the convective heat transfer coefficient under different wind pressure received the corresponding result of temperature field and stress filed，and analyzed the result．This paper analyzed that calculated heating，keeping warm，force cooling and air cooling’s temperature field and stress filed distribution in such different operating modes．Get the best heating, thermal insulation, cooling, natural air time and the result can be used to guide the quenching process design．Key words：eavy rail，Quenching，Temperature field，Stress filed，ANSYS 目 录 第一章 绪论 1 1.1 课题研究意义 1 1.2 影响重轨淬火技术的主要因素 2 1.3 重轨淬火数值模拟的国内外研究现状 2 1.4 研究内容 4 第二章 重轨淬火温度场和应力场的理论基础 4 2.1 重轨淬火温度场理论基础 5 2.1.1 热传递方式 5 2.1.2 重轨淬火时定解条件 5 2.1.3 淬火时热传导初始条件 6 2.1.4 重轨淬火的边界条件 6 2.2 重轨淬火应力场理论基础 8 2.2.1 热弹性和热塑性问题 8 2.2.2 热弹塑性问题的求解 9 2.