scholarly journals An improved interface temperature distribution in shallow hot mix asphalt patch repair using dynamic heating

2018 ◽  
Vol 21 (13) ◽  
pp. 1617-1625
Author(s):  
Juliana Byzyka ◽  
Mujib Rahman ◽  
Denis Albert Chamberlain
Keyword(s):  
Temperature Distribution ◽  
Hot Mix Asphalt ◽  
Patch Repair ◽  
Interface Temperature ◽  
Dynamic Heating

Influence of Tool Holder Material on Interfacial, Insert and Tool Holder Temperatures During Turning Operation of Gray Iron

2012 ◽  
Author(s):  
Almir K. Kaminise ◽  
Gilmar Guimaraes ◽  
Marcio B. Da Silva
Keyword(s):  
Temperature Distribution ◽  
Carbon Steel ◽  
Cutting Tool ◽  
Gray Iron ◽  
Cutting Fluid ◽  
Interface Temperature ◽  
Turning Operation ◽  
Tool Holder ◽  
Cutting Insert ◽  
Thermocouple Method

Usually studies related to machining temperature consider a system comprised of workpiece, chip and cutting tool, the effect of tool holder material is not taken in account. However, due to its physical properties, the tool holder material, usually carbon steel, has effect in the dissipation of the heat generated. This work studies the effect of the tool holder material on the temperature distribution during the turning operation of gray iron using cemented carbide cutting tool and without cutting fluid. Five tool holders were manufactured from materials with different heat conductivity: carbon steel, stainless steel, titanium, copper and bronze. Temperatures in eight different positions in the tool holder and cutting insert were measured. The average temperature at the chip tool interface was also measured using the tool-work thermocouple method. The results showed that the measured chip tool interface temperature was less affected by the tool holder material, although the temperature distribution at the cutting tool is highly affected.

scholarly journals An innovative asphalt patch repair pre–heating method using dynamic heating

2018 ◽  
Vol 188 ◽  
pp. 178-197 ◽  
Author(s):  
Juliana Byzyka ◽  
Mujib Rahman ◽  
Denis Albert Chamberlain
Keyword(s):  
Patch Repair ◽  
Heating Method ◽  
Dynamic Heating

A Remote Temperature Sensing Technique for Estimating the Cutting Interface Temperature Distribution

1986 ◽  
Vol 108 (4) ◽  
pp. 252-263 ◽  
Author(s):  
David Wei Yen ◽  
Paul K. Wright
Keyword(s):  
Inverse Problem ◽  
Temperature Distribution ◽  
Measurement Errors ◽  
Three Dimensional ◽  
Cutting Temperature ◽  
Transformation Matrix ◽  
Dimensional Case ◽  
Interface Temperature ◽  
Unknown Boundary ◽  
Ellipsoidal Coordinates

Cutting temperature is a major factor in controlling tool wear rate. Thus, sensing and control of cutting temperature is important in achieving a desired tool performance. This paper is concerned with estimating the cutting interface temperature distribution based on remote temperature measurements. This class of problems of estimating unknown boundary conditions from known interior quantities is called the inverse problem. The inverse problem of a square insert under steady state conditions is considered in this paper. The temperature distribution in a square insert is best described in Ellipsoidal Coordinates. The mapping functional in the one-dimensional case is solved analytically. The mapping functionals in general three-dimensional cases are solved numerically using the semianalytical finite element method. The mapping functional in a three-dimensional case is represented by a transformation matrix which maps one vector representing the cutting interface temperature distribution to another vector representing the remote temperatures. The transformation matrix is then used to solve the inverse problem of estimating the interface temperature distribution with redundant remote measurements. Measurement errors and transformation matrix errors are imposed in simulation studies. The sensitivity of inverse solutions to these errors is discussed.

Evaluation of the Transient Temperature Distribution of End-Face Sliding Friction Pair Using Infrared Thermometry

2014 ◽  
Vol 613 ◽  
pp. 213-218
Author(s):  
Wei Wei ◽  
Jian Wei Yu ◽  
Tao You ◽  
Xiao Fen Yu ◽  
Yong Hong Wang
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Measurement System ◽  
Sliding Friction ◽  
Friction Pair ◽  
Dynamic Performance ◽  
Constant Load ◽  
Interface Temperature ◽  
Transient Temperature ◽  
Ir Thermography

A real-time temperature measurement system was designed for end-face sliding friction pairs with an infrared (IR) probe and IR thermography installed on it. The approximate temperature of contact surface was measured by the probe while non-contact surface’s temperature distribution was determined with the IR thermography. Two experiments with constant load but varied rotational speeds were carried out, and a preliminary study was made to analyze the variation of temperature in the friction process. Furthermore, the probe data was used as thermal load to calculate the temperature field by the FEM model and the result was verified using IR images. The experimental results showed that the infrared measurement system can detect and record the interface-temperature variation accurately. The probe data showed a good dynamic performance with the variation of friction coefficient. In addition, the calculated temperature field showed good accordance with the IR thermography data.

Quasi-Steady-State Temperature Distribution in Periodically Contacting Finite Regions

1981 ◽  
Vol 103 (4) ◽  
pp. 739-744 ◽  
Author(s):  
B. Vick ◽  
M. N. O¨zis¸ik
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Steady State ◽  
Temperature Distribution ◽  
Interface Temperature ◽  
Quasi Steady State ◽  
Exact Analytical Solutions ◽  
One Dimensional ◽  
Steady State Temperature ◽  
Regular Cycle

Heat transfer across two surfaces which make and break contact periodically according to a continuous regular cycle is investigated theoretically and exact analytical solutions are developed for the quasi-steady-state temperature distribution for a two-region, one-dimensional, periodically contacting model. The effects of the Biot number, the thermal conductivity and thermal diffusivity of the materials and the duration of contact and break periods on the interface temperature and the temperature distribution within the solids are illustrated with representative temperature charts.

Estimation of Crater Temperatures Using Infrared Camera

2000 ◽  
Author(s):  
Patrick Kwon
Keyword(s):  
Steady State ◽  
Temperature Distribution ◽  
Heat Conduction Problem ◽  
Infrared Camera ◽  
Video Camera ◽  
Interface Temperature ◽  
Transient Temperature ◽  
Flux Boundary Condition ◽  
Transient Temperature Distribution ◽  
Aisi 1045

Abstract A new technique is developed to estimate the average steady state chip-tool interface temperature during turning. An infrared (IR) video camera attached on the carriage of the lathe measures the transient cooling behavior on the rake surface of an insert after the feed motion is halted. This allows the zero heat flux boundary condition, where the transient Laplace heat conduction problem can be solved numerically to obtain the temporal and spatial temperature distribution. With the experimentally determined transient temperature distribution, the 1-D ellipsoidal model is used to estimate the average steady-state chip-tool interface temperature during machining. The results on turning Gray Cast Iron (GCI) and AISI 1045 steels with various coated and uncoated carbide inserts are presented.

Heat Transfer During Drop Impact Onto Wetted Heated Smooth and Structured Substrates: Experimental and Theoretical Study

2010 ◽  
Author(s):  
Tatiana Gambaryan-Roisman ◽  
Mete Budakli ◽  
Ilia V. Roisman ◽  
Peter Stephan
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Film Thickness ◽  
Spray Cooling ◽  
Drop Impact ◽  
Interface Temperature ◽  
Heated Plate ◽  
Initial Film ◽  
Impact Parameters ◽  
Heated Plates

Spray cooling is a very effective means of heat removal from hot surfaces. Its efficiency can be further improved using structured wall surfaces. One of the fundamental processes governing spray cooling is an impact of a single cold droplet onto a heated wetted wall. The hydrodynamics of drop impact governs the transient heat transport in the film and in the wall. We study hydrodynamics and heat transfer during impact of a single drop onto heated smooth and structured heated plates. The temperature distribution in the heated plates has been measured with seven thermocouples. The splash dynamics and the evolution of interface temperature distribution have been visualized using high-speed infrared thermography. The film thickness evolution in the inner region has been measured using chromatic confocal imaging technique. Initial film thickness and drop impact parameters have been varied in the experiments. The evolution of the temperature distribution at the liquid-gas interface and the instationary temperature distribution in the heated plate depend on the initial film thickness, impact parameters and the plate topography. A self-similar analytical solution of the full Navier-Stokes equations and of the energy equation is obtained for the velocity and temperature fields in the spreading film. The theory allows prediction of the contact temperature and the residual film thickness.

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