摘要
为了准确预测热成形中的界面传热特性,提出了一种考虑侧接触切向滑动的微凸体弹塑性变形传热模型.利用材料在塑性变形时的体积守恒原理,对单对侧接触微凸体在切向滑动时的传热模型进行分析,基于微凸体弹塑性变形理论,分析了粗糙表面上单对球形微凸体在侧接触切向滑动时的变形模式与接触压力的关系,推导出单对球形微凸体在弹塑性变形时的传热模型,并将推导模型与有限元法(FEM)的模拟结果进行比较,以验证其准确性.结果表明,所提出的模型在完全塑性接触条件下对接触压力的预测结果与FEM分析的结果接近.随着接触压力增大,侧接触微凸体的传热系数增大;随着滑动位移增大,产生的摩擦热增加,侧接触微凸体的传热系数增大.
In order to accurately predict the interface heat transfer behavior during hot metal forming process, this paper proposes an elastic-plastic deformation heat transfer model after considering shoulder shoulder contact asperities in tangential sliding conditions. By the volume conservation principle of the ma- terial during plastic deformation, the contact heat transfer of a single pair asperities in shoulder shoulder contact and tangential sliding is analyzed. Based on asperity elastic-plastic deformation theory, the rela- tionship between the load and the spherical asperities shoulder-shoulder contact elastic-plastic deformation pattern on the rough contact surface is analyzed and contact heat transfer model of the single pair spherical asperities under elastic-plastic deformation is established, and comparison of the proposed model and the finite element method and to verify is completed to verify its accuracy. Results show that the forecast results by the proposed model is close to FEM simulation results under the condition of fully plastic contact. The shoulder-shoulder contact asperities heat transfer coefficient increases with increase of the load. The coefficient increases with increases o{ the sliding displacement and friction heating.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2017年第5期520-525,共6页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金项目(51005149)资助
关键词
热成形
表面粗糙度
微凸体
侧接触
切向滑动
传热
hot metal forming
surface roughness
asperities
shoulder-shoulder contact
tangential slid-ing
heat transfer
