Related Experiment Video
Updated: Aug 7, 2026
10:52
Conducting Elevated Temperature Normal and Combined Pressure-Shear Plate Impact Experiments Via a Breech-end Sabot Heater System
Published on: August 7, 2018
On the flash temperature in accelerated sliding contacts
1Institut fuer Festkoerperforschung, Forschungszentrum Juelich, D-52425 Juelich, Juelich, 52428, Germany.
Summary
Sliding solids generate high temperatures, impacting friction and wear. This study extends flash temperature theory to accelerated motion, providing numerical insights into these thermal effects.
Area of Science:
- Tribology
- Materials Science
- Solid Mechanics
Background:
- Sliding contact between solids generates significant localized heating, known as flash temperature.
- Elevated temperatures in contact regions critically influence friction, wear, and material integrity.
- Existing theories primarily address constant velocity sliding, limiting applicability to transient scenarios.
Purpose of the Study:
- To extend the multiscale theory of flash temperature to include accelerated motion.
- To provide a theoretical framework for analyzing transient frictional heating.
- To investigate the impact of acceleration on temperature rise in sliding contacts.
Main Methods:
- Extension of an existing multiscale theory for flash temperature calculation.
- Development of a theoretical model incorporating accelerated motion.
- Numerical simulations to illustrate the theoretical predictions.
Main Results:
- The extended theory accurately models flash temperature under accelerated sliding conditions.
- Numerical results demonstrate the significant influence of acceleration on peak temperatures.
- The findings highlight the importance of considering dynamic effects in tribological analyses.
Conclusions:
- The developed theory provides a robust method for predicting flash temperatures during accelerated sliding.
- Understanding these transient thermal effects is crucial for designing reliable tribological systems.
- This work offers a foundation for further research into dynamic friction and wear phenomena.
Related Concept Videos
01:09Thermal Stress
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
01:20Mechanisms of Heat Transfer II
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
01:14Mechanisms of Heat Transfer I
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
01:27Fast Reactions
Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...
01:05Static and Kinetic Frictional Force
One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
However, if two systems are in contact and are stationary relative to one...
01:14Mechanisms of Heat Transfer
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant heat.