Finite Element Simulation of the Tightening Process of Bolted Joint With a Bolt Heater

2002 ◽  
Vol 124 (4) ◽  
pp. 457-464 ◽  
Author(s):  
Toshimichi Fukuoka ◽  
Quantuo Xu
Keyword(s):  
Finite Element ◽  
Contact Resistance ◽  
Finite Element Simulation ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Numerical Approach ◽  
Numerical Analyses ◽  
Bolted Joint ◽  
Skilled Workers ◽  
Element Simulation

The tightening operation with a bolt heater has advantages surpassing those of other tightening methods. Currently, a bolt heater is mainly applied to tighten huge bolts that cannot be clamped by other means, and the tightening operation is usually supported by the expertise of skilled workers. In this paper, a numerical approach is presented to aim at a broader use of bolt heater technique by elucidating the tightening mechanism. The effects of thermal contact resistance existing around a bolted joint are taken into account for a better accuracy in the numerical analyses. Based on the numerical results obtained, a series guideline to help the tightening operation when performed by less skilled workers is proposed.

Finite Element Simulation of Bolt-Up Process of Pipe Flange Connections

2000 ◽  
Vol 123 (3) ◽  
pp. 282-287 ◽  
Author(s):  
Toshimichi Fukuoka ◽  
Tomohiro Takaki
Keyword(s):  
Finite Element ◽  
Contact Problem ◽  
Finite Element Simulation ◽  
Arbitrary Order ◽  
Three Dimensional ◽  
Numerical Approach ◽  
Numerical Analyses ◽  
Elastic Contact ◽  
Element Simulation ◽  
Bolt Preload

Achieving uniform bolt preload is difficult when tightening a pipe flange with a number of bolts. Several bolt-tightening strategies have been proposed so far for achieving uniform bolt preloads. It seems, however, that effective guidelines for tightening pipe flange connections have not been established. In this study, a numerical approach is presented for estimating the scatter in bolt preloads and achieving the uniform bolt preloads when tightening each bolt one by one in an arbitrary order. Numerical analyses are conducted using three-dimensional FEM as an elastic contact problem. The analytical objects are pipe flanges specified in JIS B 2238 with an aluminum gasket inserted. The validity of the numerical procedures proposed here is ascertained by experiment.

Interface pressure distributions and thermal contact resistance of a bolted joint

2005 ◽  
Vol 461 (2060) ◽  
pp. 2339-2354 ◽  
Author(s):  
M Tirovic ◽  
G.P Voller
Keyword(s):  
Cast Iron ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Conductive Heat ◽  
Bolted Joint ◽  
Interface Pressure ◽  
Pressure Distributions ◽  
Area Of Interest ◽  
Wide Range

The paper studies interface pressure distributions and thermal contact resistance (TCR) of a large automotive bolted joint. The research was initiated by the need to determine accurately conductive heat dissipation from a commercial vehicle disc brake. The main area of interest was the conduction between the grey cast iron disc and the spheroidal graphite cast iron wheel carrier. The bolt clamp forces and interface pressure distributions were investigated theoretically and experimentally. Finite-element analyses and pressure-sensitive paper experiments provided very similar interface pressure distributions. TCR change with interface pressure was studied experimentally, by conducting numerous temperature measurements. The derived linear relationship is of generic nature, enabling the calculation of the TCR for a variety of engineering bolted joints, over a wide range of interface pressures.

Monitoring of L-Shape Bolted Joint Tightness Using Thermal Contact Resistance

2013 ◽  
Vol 53 (9) ◽  
pp. 1531-1543 ◽  
Author(s):  
M. Jalalpour ◽  
J. J. Kim ◽  
M. M. Reda Taha
Keyword(s):  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Bolted Joint

Finite Element Modeling of Multi-Scale Thermal Contact Resistance

2008 ◽  
Author(s):  
M. K. Thompson
Keyword(s):  
Finite Element ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Unit Area ◽  
Thermal Contact ◽  
Contact Model ◽  
Micro Scale ◽  
Multi Scale ◽  
Macro Scale ◽  
Scale Surface

Many traditional macro scale finite element models of thermal contact systems have incorporated the effect of micro scale surface topography by applying a constant value of thermal contact conductance (TCC) per unit area to the regions in contact. However, it has been very difficult to determine an appropriate TCC value for a given system and analysts typically had to rely on experimental data or values from the literature. This work presents a method for predicting micro scale TCC per unit area by incorporating micro scale surface roughness in a multi-scale iterative thermal/structural finite element contact model. The resulting TCC value is then used in a macro scale thermal/structural contact model with apparent surface form to predict the thermal contact resistance and overall thermal resistance for a commercial power electronics module.

Finite Element Modeling of Measured Rough Surfaces for the Prediction of Thermal Contact Resistance

2007 ◽  
Author(s):  
M. K. Thompson ◽  
J. M. Thompson
Keyword(s):  
Finite Element ◽  
Contact Resistance ◽  
Surface Topography ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Element Model ◽  
Surface Metrology ◽  
Surface Geometry ◽  
Finite Element Program ◽  
The Impact

Surface topography has long been considered a key factor in the performance of many contact applications. However, essentially all analytical and numerical contact models either neglect surface topography or make simplifications and assumptions about the nature of the surface which limit the quality of the models. This work presents a method for creating surface geometry by importing surface metrology data into a commercial finite element program. The measured surface geometry is then combined with a multi-scale thermal/structural finite element model to demonstrate the impact of geometric surface assumptions on the prediction of thermal contact resistance.

scholarly journals A novel finite element method for heat transfer in the continuous caster

1994 ◽  
Vol 35 (3) ◽  
pp. 263-288 ◽  
Author(s):  
Yong-Hong Wu ◽  
James M. Hill ◽  
Paul J. Flint
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Contact Resistance ◽  
Molten Steel ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Cooling Water ◽  
Mould Wall ◽  
Lubricating Layer ◽  
Mould Powder

AbstractIn the continuous casting of steel, many problems, such as surface cracks in solidified steel and breakouts of molten steel from the bottom of moulds, frequently occur in practice. It is believed that the occurrence of these problems is directly related to the events in the mould, especially the transfer of heat from the strand surface across the lubricating mould powder and its interface with the mould wall to the mould cooling-water. However, as far as the authors are aware, there is no published work dealing with heat transfer across both the lubricating layer and the interface. Generally, a parameter representing the average overall heat transfer coefficient between the strand surface and the mould cooling-water is employed, instead of including the lubricating layer, the mould wall and their interface in the computation region. The existing treatment consequently does not permit analysis of some of the more important phenomena, such as the effect of mould powder properties and interface thermal contact resistance on the solidification of steel. In this paper, a novel finite element model is developed and the heat transfer across the interface between the lubricating layer and the mould wall is simulated by introducing a new type of element, referred to as the thermal contact element. The proposed model is used to investigate the effect of various casting parameters on heat transfer from the molten steel to the cooling-water. The results indicate that the thermal contact resistance between the mould wall and the mould powder is a key factor which dominates the thickness of the solidified steel shell and the heat extraction rate from the mould wall.

scholarly journals Thermal characteristic analysis of Z-axis guideway based on thermal contact resistance

2018 ◽  
Vol 10 (10) ◽  
pp. 168781401880532 ◽  
Author(s):  
Jiandu Ji ◽  
Rongjing Hong ◽  
Fuzhong Sun ◽  
Xiaodiao Huang
Keyword(s):  
Finite Element ◽  
Contact Resistance ◽  
Machine Tool ◽  
Thermal Contact Resistance ◽  
Thermal Contact ◽  
Numerical Control ◽  
Feeding System ◽  
Large Computer ◽  
Gear Grinding ◽  
Grinding Machine

The Z-axis feeding system of large computer numerical control (CNC) gear grinding machine tools generates lots of heat during processing, which leads to tilt and pitch deformation of the Z-axis guideway and reduces the machining accuracy. In view of this situation, a three-dimensional finite element analysis method is proposed to conduct transient thermal-structural coupling analysis of the Z-axis guideway and feeding system. Considering the microscopic contact state on machine tool joint surfaces and using the root mean square measurement method, the fractal parameter is identified and the thermal contact resistance at the joints is calculated. The friction heat on the guideway is calculated and the thermal value of the motor is obtained. Then, the heat generation rate of the bearing and the screw nut is calculated according to the friction torque. The convective heat transfer coefficient is determined according to the Reynolds number and the Nusselt number. The finite element model is established to obtain the finite element simulation results of thermal error. Finally, the experimental platform for measuring the temperature and thermal deformation of the large computer numerical control gear grinding machine tool is set up, and the accuracy and reliability of the method is verified.

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