Numerical and finite element contact temperature analysis of real composite-steel surfaces in sliding contact (original) (raw)
Related papers
Tribology International, 2000
For composite-steel surfaces in sliding contact an anisotropic numerical contact algorithm has been developed to study the 'layer type' problems. An FE contact analysis was applied to evaluate the contact parameters (real contact area, contact pressure distribution and normal approach). The contact temperature rise was determined by using both a numerical thermal algorithm for stationary and a FE transient thermal technique for 'fast sliding' problems.
The real contact area between composite and steel surfaces in sliding contact
Composites Science and Technology, 2001
An anisotropic numerical contact algorithm has been developed for real composite-steel surfaces in sliding contact. The results were based on measured surface roughness data, under conditions of different fibre orientations relative to the sliding direction. The location of the real contact area at certain positions of sliding contact could be predicted. These results can be considered as input data for contact temperature calculations and wear predictions. An experimental evaluation of the real contact area was carried out by testing a composite pin under static compressive load against a gold-covered glass surface, resulting in an asperity-type contact condition. In another experiment, the composite pin was slid over the glass surface, which resulted in the removal of the gold layer along a certain path, characterising the nature of the real contact area interaction between the two surfaces. The results showed that the densities of contact spots are similar obtained by both the contact algorithm and the experimental techniques. #
Wear, 2013
This study investigates the contact temperatures caused by frictional heating of sliding parallel pairs. In this case the materials studied are a PTFE composite in contact with a high carbon steel plate. These materials are commonly used for industrial applications, in particular as the main contacting components within a scroll expander system. The expected contact temperature values are important to be quantified in order to predict failure mechanisms associated with excessive thermal effects caused by sliding friction. A rational and coherent interpretation of the thermal effects on the actual tribological contact is presented. Contact temperatures are monitored continuously using a high-precision infrared thermal imaging technique with a systematic variation in surface roughness of the high carbon steel material. These surface temperatures are investigated as a function of the friction coefficient, the sliding velocity and the applied load while the most influential parameter for the temperature rise is determined. Analytical results using conventional mathematical methodology are also produced. The analytical and experimental findings are then compared indicating interesting correlations within the macro-and microsurface temperature regimes and the experimental conditions. Microscopic observations show that thermal effects can seriously affect fibers durability while transfer films formed across the steel counterpart can be beneficial for the operation of scroll systems under specific roughness and test conditions.
IOP Conference Series: Materials Science and Engineering
In this article we have tried to present a graphical assessment of the dry linear contact for composite materials reinforced with glass fibers as well as of the influence of the sliding speed, load and friction coefficient. Perpendicular loads, the contact temperature and the wear of the metal surface were recorded .The wear volume was calculated using the Archard relationship. Using the Archard relationship, the width of trace can be calculated in 3 locations. Numerous experimental trials were performed in connection to the wear of the metal surface, the contact temperature and the value of the friction coefficient. A connection between the evolution of the wear process and the dependency on the contact temperature and friction coefficient can be observed.
FINITE ELEMENT MODELLING OF WEAR PROCESS OF A PEEK-STEEL SLIDING PAIR AT ELEVATED TEMPERATURE
The operational conditions for polymer-steel sliding pairs frequently produce higher temperature because of the frictional heat generation and/or some environmental sources. To study the wear behaviour an incremental wear simulation technique have been developed, which can consider the temperature- and time-dependent behaviour of polymer materials and evaluate the contact behaviour during the wear process by changing the initial clearance between the pin and disc according to the linear wear equation. The wear simulation technique proposed is applied for a Pin-on-Disk configuration considering creep behaviour of a PEEK material, the frictional heat generation and the thermal expansion. The results illustrate the initial part of the wear process, which involves the edge-like contact and the full contact phases.
The wear resistance of steel in linear contact on composite materials
Proceedings of BULTRIB, 2005
Generally one could make a tribological characterization of frictional couples based on a theoretical contact model and some numerical results obtained on an experimental model built on the theoretical basis. This procedure offers characterization data only for one couple, with the same kind of contact and the same loading conditions, without any possibility of generalization. The present study introduces the comparative wearing coefficient concept as criteria for the evaluation of the behavior of tribological couples with the same kind of contact (linear one) and obtained from the same category of materials (e.g. composite thermoplastics/steel) as a function of the length of frictional path.
The surface temperature prediction on steel-tool steel sliding pairs
2019 8th International Conference on Modeling Simulation and Applied Optimization (ICMSAO), 2019
There have been needs to understand the effect of temperature on the wear of tool steel used in manufacturing process. Measuring the contact temperature between steel-tool steel pairs in an industrial manufacturing process can be challenging. This study examines the theoretical and numerical prediction of temperature at the sliding contact surfaces of steel-steel pairs using the pin-an-disc and Archard models. The results showed a good correlation between numerical and theoretical calculation of contact temperature. There was abrupt increase in the contact temperature at the contacting surfaces as the sliding speed was increased beyond 35 mm/s. Localization of high peak temperature at the contact regions of the sliding surfaces observed in this study may be important in the wear mechanism of sliding bodies and wider manufacturing community.
Wear Resistance of Steel in Linear Contact on Composite Materials
2004
Generally one could make a tribological characterization of frictional couples based on a theoretical contact model and some numerical results obtained on an experimental model built on the theoretical basis. This procedure offers characterization data only for one couple, with the same kind of contact and the same loading conditions, without any possibility of generalization. The present study introduces the comparative wearing coefficient concept as criteria for the evaluation of the behavior of tribological couples with the same kind of contact (linear one) and obtained from the same category of materials (e.g. composite thermoplastics/steel) as a function of the length of frictional path.
Wear, 2001
FE micro-models have been developed in order to determine contact, stress and strain conditions produced by a steel asperity sliding on the surface of a fibre-reinforced polymer composite. Three cases were studied, i.e. a normal, a parallel and an anti-parallel fibre orientation relative to the sliding direction. In order to get more realistic simulation results about the failure conditions in the composite structure, FE contact macro/micro-models were used, contrary to the so far widely applied anisotropic analytical or numerical macro-models. To model a "micro-environment" as part of a "macro-environment", the displacement coupling technique was introduced. On the basis of the stress results, conclusions were drawn on the possible wear mechanisms of the fibre-reinforced polymer composites. For each fibre orientation, surface failure of the matrix material occurs due to high shear stresses. The other characteristic source of failure is fibre/matrix debonding, eventually followed by fibre cracking events.
One of the most important issues in dry sliding contact is the frictional heat generated. This study investigates the flash temperatures caused by frictional heating of sliding parallel pairs: a high performance fluoroelastomer composite with a high carbon steel plate. These materials have industrial applications and in particular as the main contacting components within a scroll expander system. The expected flash temperature values of the studied contacts are important to be revealed in order to predict the wear mechanisms associated with excessive contact temperatures caused by sliding friction. Two different roughness profiles of the high carbon steel plate were used. The flash temperatures generated by the asperities contact of the tested materials were investigated as a function of the friction coefficient, the applied pressure and the sliding velocity, using a reciprocating tribometer. Initially physical experimental observations of the specific contact produced with a high- ...