scholarly journals Discussion: “A Mathematical Model for Frictional Elastic-Plastic Sphere-on-Flat Contacts at Sliding Incipient” (Chang, L., and Zhang, H., 2007, ASME J. Appl. Mech., 74, pp. 100–106)

2007 ◽  
Vol 74 (5) ◽  
pp. 1057-1057
Author(s):  
Izhak Etsion
Keyword(s):  
Mathematical Model ◽  
Elastic Plastic ◽  
Plastic Sphere

A Mathematical Model for Frictional Elastic-Plastic Sphere-on-Flat Contacts at Sliding Incipient

2005 ◽  
Vol 74 (1) ◽  
pp. 100-106 ◽  
Author(s):  
L. Chang ◽  
H. Zhang
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Shear Strength ◽  
Contact Pressure ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
Contact Model ◽  
Elastic Plastic ◽  
Plastic Sphere ◽  
Flat Contact

This paper presents a mathematical model for frictional elastic-plastic sphere-on-flat contacts at sliding incipient. The model is developed based on theoretical work on contact mechanics in conjunction with finite-element results. It incorporates the effects of friction loading on the contact pressure, the mode of deformation, and the area of contact. The shear strength of the contact interface is, in this paper, assumed to be proportional to the contact pressure with a limiting value that is below the bulk shear strength of the sphere. Other plausible interfacial-shear-strength characteristics may also be implemented into the contact model in a similar manner. The model is used to analyze the frictional behavior of a sphere-on-flat contact where the experimental data suggest that the interfacial shear strength is similar in nature to the one implemented in the model. The theoretical results are consistent with the experimental data in all key aspects. This sphere-on-flat contact model may be used as a building block to develop an asperity-based contact model of rough surfaces with friction loading. It may also serve in the modeling of boundary-lubricated sliding contacts where the interfacial shear strength in each micro-contact is coupled with its flash temperature and related to the lubricant/surface physical-chemical behavior.

Multiple Loading-Unloading of an Elastic-Plastic Spherical Contact

2005 ◽  
Author(s):  
Yuri Kadin ◽  
Yuri Kligerman ◽  
Izhak Etsion
Keyword(s):  
Plastic Deformation ◽  
Elastic Limit ◽  
Loading Conditions ◽  
Spherical Contact ◽  
Elastic Plastic ◽  
Wide Range ◽  
Plastic Sphere ◽  
Multiple Loading

A model for multiple loading-unloading of an elastic-plastic sphere and a rigid flat is presented to cover a wide range of loading conditions far beyond the elastic limit. It is shown that although most of the plastic deformation occurs during the first loading, additional plastic deformation may evolve during the first unloading and a few subsequent loading-unloading cycles.

Effects of load configuration on partial slip contact between an elasticplastic sphere and a rigid flat

2013 ◽  
Vol 61 ◽  
pp. 120-128 ◽  
Author(s):  
Xi Shi ◽  
Aizhong Wu ◽  
Changming Zhu ◽  
Shaoxing Qu
Keyword(s):  
Partial Slip ◽  
Elastic Plastic ◽  
Plastic Sphere

Thermo-mechanical contact between a rigid sphere and an elastic–plastic sphere

2016 ◽  
Vol 95 ◽  
pp. 132-138
Author(s):  
Wenping Song ◽  
Longqiu Li ◽  
Andrey Ovcharenko ◽  
Frank E. Talke
Keyword(s):  
Rigid Sphere ◽  
Mechanical Contact ◽  
Elastic Plastic ◽  
Plastic Sphere

Theoretical Model of Plastic Hysteresis in Spherical Contact Under Combined Normal and Tangential Loading

2008 ◽  
Author(s):  
Yuri Kligerman ◽  
Izhak Etsion
Keyword(s):  
Theoretical Model ◽  
Stress State ◽  
Friction Force ◽  
Contact Area ◽  
Contact Condition ◽  
Experimental Results ◽  
Tangential Displacement ◽  
Elastic Plastic ◽  
Plastic Sphere ◽  
Good Agreement

The behavior of an elastic-plastic contact between a deformable sphere and a rigid flat under combined constant normal and reciprocating tangential loading is investigated in the present work. The theoretical model is based on the assumptions of full stick contact condition and two kinds of the sphere material hardening. Hysteretic change of friction force versus tangential displacement during reciprocating tangential loading is investigated along with the study of the change of the contact area and stress state in the elastic-plastic sphere. Good agreement between theoretical and experimental results is obtained.

Cyclic Loading of an Elastic-Plastic Adhesive Contact

2008 ◽  
Author(s):  
Y. Kadin ◽  
Y. Kligerman ◽  
I. Etsion
Keyword(s):  
Numerical Simulation ◽  
Plastic Deformation ◽  
Cyclic Loading ◽  
Contact Interaction ◽  
Adhesive Contact ◽  
Cyclic Plasticity ◽  
Electric Contact ◽  
Elastic Plastic ◽  
Plastic Sphere ◽  
Mems Device

A numerical simulation is presented for several loading-unloading cycles of an adhesive contact between an elastic-plastic sphere and a rigid flat. The main goal of the simulation is to study the plastic deformation evolution in a contact bump material — the microscopic electrode found in a MEMS micro-switch for providing a good electric contact. This bump is subjected to a cyclic contact interaction with a harder substrate and cyclic plasticity of the bump material can lead to its wear and as result to a failure of the whole MEMS device.

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