Mechanics & Industry
Volume 18, Number 3, 2017
|Number of page(s)||8|
|Published online||23 March 2017|
Research on the equivalent elastic modulus of mechanical joint interface
1 College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing, 100124, P.R. China
2 Biomechanics and Medical Information Institute, Beijing University of Technology, Beijing 100022, P.R. China
a Corresponding author: firstname.lastname@example.org
Received: 20 February 2016
Accepted: 1 September 2016
Mechanical joint interfaces widely exist in all kinds of components. Their properties are extremely complex as there are a variety of factors affecting contact characteristics such as material, surface roughness, processing method and heat treatment. This study investigated the static mechanical performances of joint interface under cyclic compression loads. A new joint model was established and described as one continuum with three layers of materials, wherein the joint interface was assumed as a layer of material with thickness hc. Then the corresponding theoretical expressions of Total Equivalent Elastic Modulus (Et) and Interface Equivalent Elastic Modulus (Ei) were proposed. A series of cyclic compression experiments were conducted. And the effects of loading stress, number of cycles and surface roughness on Et and Ei was discussed respectively. Results indicated that Et increases first and then levels off with the stress increasing. Et approaches a steady state with the increasing number of cycles. And the modulus decreases with the increase of surface roughness of the joint interface. In addition, Ei is a function of Et and the thickness of joint interface hc. The cumulative plastic strain occurs with a repeated loading on the joint interface.
Key words: Joint interface / total equivalent elastic modulus / interface equivalent elastic modulus / surface roughness
© AFM, EDP Sciences 2017
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