摘要
高速动车组制动闸片的温度和应力分布,是影响动车安全运行的关键。基于传热学相关知识和有限元数值模拟技术,考虑了弹性模量、泊松比、导热系数和比热容等材料参数随温度变化的影响,确定了制动过程中闸片热载荷和换热系数的计算方法,建立了闸片制动过程中的热传导模型,并利用ANSYS软件建立了闸片热-力耦合三维仿真模型。通过仿真得到了制动过程中闸片的温度场和应力场分布规律。仿真结果表明:制动62 s后,闸片温度达到最大值535℃;制动75 s后,闸片应力达到最大值333 MPa。所研制的某型闸片符合工程要求。
The temperature and stress distribution in brake pads is a key factor for the high-speed multiple units safe operation. According to the heat transfer theory and using the finite element simulation technology, a heat con- duction model of brake pad was established in this paper. The impact due to the elastic modulus, poisson ratio, thermal conduction and specific heat was considered and the calculation method of thermal load and heat transfer coefficient was also presented. A 3 D thermal-stress coupling simulation model for the braking of brake pad was built by software ANSYS. Then the dynamic temperature and stress distribution in the braking of brake pad were ob- tained and verified by experiemnts. The simulation result shows that the brake pad would reach the max temperature 535 ℃at 62 s and the max stress 333 MPa at 75 s. Owing to the temperature simulation results in accordance with the expermental results basically, it could demonstrate that the simulation method was effective and this type of brake pads studied in the paper met the practice requirements.
出处
《机械科学与技术》
CSCD
北大核心
2012年第9期1377-1383,共7页
Mechanical Science and Technology for Aerospace Engineering
基金
国家高技术研究发展计划项目(863计划
2006AA03Z508)
中南大学研究生教育创新工程选题项目(1343-77302)资助
关键词
制动闸片
温度场
热力耦合分析
有限元
brake pad
temperature field
thermal stress coupling analysis
finite element
