Closure to “Discussions of ‘A Thermal, Thermoelastic, and Wear Simulation of a High-Energy Sliding Contact Problem’” (1974, ASME J. Lubr. Technol., 96, pp. 505–506)

1974 ◽  
Vol 96 (3) ◽  
pp. 507-507
Author(s):  
F. E. Kennedy ◽  
F. F. Ling
Keyword(s):  
Contact Problem ◽  
High Energy ◽  
Sliding Contact ◽  
Wear Simulation

A Thermal, Thermoelastic, and Wear Simulation of a High-Energy Sliding Contact Problem

1974 ◽  
Vol 96 (3) ◽  
pp. 497-505 ◽  
Author(s):  
F. E. Kennedy ◽  
F. F. Ling
Keyword(s):  
Contact Problem ◽  
Friction Surface ◽  
Thermomechanical Analysis ◽  
High Energy ◽  
Sliding Contact ◽  
Transient Temperature ◽  
Wear Rates ◽  
Disk Brake ◽  
Transient Temperature Distribution ◽  
Disk Brakes

This paper describes an investigation of the sliding contact problem encountered in high-energy disk brakes. The analysis includes a simulation modeling, using the finite element method, of the thermoelastic instabilities that cause transient changes in contact to occur on the friction surface. In order to include the effect of wear of the concentrated contacts on the friction surface, a wear criterion is proposed that results in prediction of wear rates for disk brakes that are quite close to experimentally determined wear rates. The thermal analysis shows that the transient temperature distribution in a disk brake can be determined more accurately by use of this thermomechanical analysis than by a more conventional analysis that assumes constant contact conditions. It is also shown that lower, more desirable, temperatures in disk brakes can be attained by increasing the volume, the thermal conductivity, and especially, the heat capacity of the brake components.

Penalty Method Involving Electric Sliding Contact Problem

2014 ◽  
Vol 701-702 ◽  
pp. 246-249
Author(s):  
Sai Tan ◽  
Jun Yong Lu ◽  
Xin Lin Long ◽  
Xiao Zhang
Keyword(s):  
Finite Element ◽  
Contact Problem ◽  
Physical Quantity ◽  
Penalty Method ◽  
Sliding Contact ◽  
Interface Condition ◽  
Calculation Results ◽  
Coupled Equation ◽  
Finite Element Formulations ◽  
Methods Numerical

Basing on governing Maxwell and energy equation of rail gun considering armature movement in two dimension, The total domain to be solved is divided into two subdomains: moving (armature) part and static (rail) part, finite element formulations of two subdomains are built independently, then using the interface condition of two subdomains, formulations are connected by coupled equation which is derived out by penalty method. Shifted physical quantity is used to simulate movement. The final magnetic-thermal coupled fields finite element formulations of rail gun are established by these methods. Numerical calculation results compared by theoretical and other numerical results verify that penalty method is an effective way to deal with electric sliding contact problem associating with Shifted physical quantity method.

Viscoelastic Contact of a Half-Plane Sliding Over a Slightly Wavy Rigid Surface

2014 ◽  
Author(s):  
N. Menga ◽  
C. Putignano ◽  
T. Contursi ◽  
G. Carbone
Keyword(s):  
Contact Problem ◽  
Contact Area ◽  
Analytical Procedure ◽  
Sliding Contact ◽  
Rigid Surface ◽  
Viscoelastic System ◽  
Contact Conditions ◽  
Partial Contact ◽  
Full Contact ◽  
Viscoelastic Contact

In this paper, the sliding contact of a rigid sinusoid over a viscoelastic halfplane is studied by means of an analytical procedure that reduced the original viscoelastic system to an elastic equivalent one, which has been already solved in [1]. In such a way, the solution of the original viscoelastic contact problem requires just to numerically solve a set of two integral equations. Results show the viscoelasticity influence on the solution by means of a detailed analysis of contact area, pressure and displacement distribution. A particular attention is paid to the transition from full contact to partial contact conditions.

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