摘要
针对高速动车组制动盘在制动过程中因温度急剧上升,使制动盘受热膨胀产生热应力,最终出现热裂纹而导致制动盘失效的问题,根据热传导理论、弹性力学变分原理及热应力理论,分析制动盘在各界面上产生的热传导、对流和辐射换热以及受热膨胀产生的热应力。依据实际几何尺寸,建立制动盘的循环对称三维瞬态计算模型,考虑弹性模量、比热容、导热系数和线胀系数等材料参数随温度变化的影响,利用大型有限元分析软件ANSYS模拟制动盘的制动过程,分析计算制动盘温度与应力的分布,并通过试验得到验证。仿真结果表明:高速动车组在时速为200 km/h下紧急制动,制动后40 s制动盘最高温度达到416℃,制动后60 s最大应力达到651 MPa,所设计的制动盘满足强度许用应力要求。
For the high-speed electric multiple disc brake,as the disc temperature rises sharply during braking,the expansion of the brake disc heat generates heat stress and it causes the braking disc to fail at last.On the basis of heat conduction theory,variational principles in elasticity and thermal stress theory,heat conduction,heat convection and radiation heat transfer produced in each interface and heat stress generated by the expansion of the brake disc heat are analysed.According to the actual dimension of the braking disc,a 3-dimentional cycle-symmetric transient model of brake disc was established.Considering the impact due to the change of elastic modulus,specific heat,thermal conductivity,thermal expansion coefficient and poisson ratio over temperature in virtual simulation process and by means of large-scale finite element software ANSYS,the braking process of the brake disc was simulated,and the temperature and stress distribution in the braking discs was calculated and verified by the test.The simulation results indicate that brake disc reaches the max temperature 416 ℃ at 40 s and reaches the max stress 651 MPa at 60 s after starting at the speed of 200 km/h during emergency braking of high-speed electric multiple,and the designing disc brake can meet the strength requirement.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第4期1334-1339,共6页
Journal of Central South University:Science and Technology
基金
国家高技术研究发展计划("863"计划)项目(2006AA03Z508)
中南大学研究生教育创新工程选题项目(1343-77302)
关键词
动车组
制动盘
温度场
应力场
有限元
electric multiple units
brake disc
temperature field
stress field
finite element
