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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第9期    总第289期    2018年9月

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文章编号:1672-7207(2018)09-2184-07
微凸体相互作用对界面法向接触特性和能量耗散的影响
王庆朋1, 2,张力1,唐志刚1,张韬1

(1. 重庆大学 汽车工程学院,重庆,400044;
2. 河南农业大学 机电工程学院,河南 郑州,450002
)

摘 要: 为了预测粗糙界面上微凸体相互作用对法向接触特性和能量耗散的影响,在确定性接触模型的基础上,增加几何重叠和固体表面能等约束条件,对发生相互作用的微凸体进行等体积合并。通过不同的法向载荷、采样间隔和粗糙度等方案,分析微凸体相互作用对法向接触刚度、阻尼和能量耗散的影响,并与相互独立的结果进行对比。研究结果表明:单个球体的接触面积与测试结果较好地吻合,验证了本研究模型的可行性;粗糙界面上法向接触参量与采样间隔均为正相关;接触刚度和阻尼随着粗糙度的降低而增加,而能量耗散随着粗糙度的降低而增大。对于小的变形量和大的采样间隔,微凸体相互作用可以忽略,但随着变形量增加以及采样间隔减小均有明显的影响,与相互独立的结果相比,法向接触刚度和阻尼变小,而能量耗散增加。

 

关键词: 界面;微凸体相互作用;法向接触;能量耗散

Normal contact properties and energy dissipation of interface considering asperity interaction
WANG Qingpeng1, 2, ZHANG Li1, TANG Zhigang1, ZHANG Tao1

1. School of Automotive Engineering, Chongqing University, Chongqing 400044, China;
2. School of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China

Abstract:Based on the deterministic contact model, a model with asperity interaction was developed to predict the effects on the normal contact properties and energy dissipation of rough interface. The constraint conditions like overlapping contact spots and the solid surface energy were added to the geometrical model, and the asperities with interaction was merged to create a larger cluster with equivalent area. The effects of the interactions between asperities on normal contact stiffness, damping and energy dissipation were analyzed through various normal loadings, sampling intervals and roughnesses, and then compared with the results of independent asperities. The results show that the contact area has good agreement with the measurements for the individual sphere. The feasibility of this research model is thus verified. The correlation between normal contact parameters of rough interface and sampling interval is positive. The normal contact stiffness and damping increase with the decrease of roughness, but the energy dissipation shows an opposite trend. The differences between independent asperities and interactive asperities at smaller displacements and larger sampling intervals become almost negligible. However, there is a significant change occurs when the greater normal displacements and smaller sampling intervals are applied, which leads to the decrease of the normal contact stiffness and damping and the increase of the energy dissipation.

 

Key words: interface; asperity interaction; normal contact; energy dissipation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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