Thermal Expansion Analysis of the Complex Body Assemblies

2013 ◽  
Vol 309 ◽  
pp. 162-169 ◽  
Author(s):  
Sever Alexandru Haba ◽  
Gheorghe Oancea
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Finite Element Modelling ◽  
Thermal Field ◽  
Linear Thermal Expansion ◽  
Software Tool ◽  
Engine Block ◽  
Digital Manufacturing ◽  
Air Cooling ◽  
Shrink Fit

This paper presents a method of finite element modelling used for thermal expansion analysis of the complex body assemblies. In this research, the assembly of complex body consists of single cylinder air cooling engine block and fixtures necessary for machining and assembling with cylinder casing. The assembly is loaded with an uniform distributed thermal field and the thermal expansion for internal sections of engine block is determined. The minimum section is used for assembling between engine block and cylinder casing by shrink fit technology. The paper also presents a comparison between results obtained using two different methods: linear thermal expansion and finite element method. The final results are implemented in a software tool, named GENgine, developed by the authors and used for digital manufacturing of engine block.

Stress Measurement Using a Bilayer Metal-Ceramic Strip

1992 ◽  
Vol 264 ◽  
Author(s):  
Shukla Kapur ◽  
Philip L. Flaltz
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Residual Stresses ◽  
Finite Element Modelling ◽  
Stress Measurement ◽  
Second Phase ◽  
Thermal Expansion Mismatch ◽  
Element Modelling ◽  
Metal Ceramic ◽  
Stress Asymmetry

AbstractResidual stresses that develop in metal/ceramic bonded systems due to thermal expansion mismatch have been calculated using finite element modelling and measured experimentally using a simple bilayer strip. Bending in the strip occurs during cooling due to the stress asymmetry. Residual stresses are calculated by measuring the deflection of the strip and the temperature at which the strip is flat. Various compositions of both copper and nickel pastes, with and without glass and other second phase additions were evaluated on glass-ceramic. The effects of further processes, e.g. thermal cycling, brazing and plating, are also reported in this work.

scholarly journals Thermal analysis of metal-ceramic bonding using finite element method

2014 ◽  
Vol 3 (2) ◽  
pp. 216 ◽  
Author(s):  
S. Gopinath ◽  
R Sabarish ◽  
R. Sasidharan
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Thermal Stress ◽  
Bonding Strength ◽  
Coefficient Of Thermal Expansion ◽  
Linear Thermal Expansion ◽  
Processing Temperature ◽  
Element Analysis ◽  
Metal Ceramic ◽  
The Difference

This paper reports a finite element study of effect of bonding strength between metal and ceramic. The bonding strength is evaluated with different processing temperature and holding time. The difference between the coefficients of linear thermal expansion (CTEs) of the metal and ceramic induces thermal stress at the interface. The mismatch thermal stress at the interface region plays an important role in improving bonding strength. Hence, it is essential to evaluate the interface bonding in metal-ceramics joints. The Al/SiC bonding was modeled and analyzed using finite element analysis in ANSYS (v.10). Keywords: Bonding Strength, Coefficient of Thermal Expansion, Thermal Stress, Interface, Al/Sic, FEA.

Finite-element modelling of two-disc shrink fit assembly and an evaluation of material pairs of discs

2010 ◽  
Vol 225 (2) ◽  
pp. 263-273 ◽  
Author(s):  
F Ozturk
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Modelling ◽  
The Finite Element Method ◽  
Uniform Stress ◽  
Element Modelling ◽  
Hollow Shaft ◽  
Complex Shapes ◽  
Shrink Fit ◽  
Good Agreement

In this study, a two-disc shrink fit assembly was modelled in two dimension using ABAQUS/Standard to determine the interfacial pressures with respect to the interferences. Steel—steel and steel—aluminium material pairs were considered. Inner disc of the assembly was considered as hollow and solid shafts, respectively. The results indicate that the finite-element results were in good agreement with the analytical results. In the hollow shaft assembly, both the hollow shaft and the outer disc had non-uniform stress distribution. In the solid shaft assembly, uniform stress distribution for the solid shaft and non-uniform stress distribution for the outer disc were determined. It was pointed out that same pressure can be obtained by different interference with different material pairs. If the assembly has complex shapes, the finite-element method gives more comprehensive and accurate results than the analytical method.

Mechanism of Rotational Screw Thread Loosening in Bolted Joints Under Repeated Temperature Changes

2007 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Mitsutoshi Ishimura ◽  
Hiroshi Yamanaka ◽  
Yusuke Fukuba
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Room Temperature ◽  
Linear Thermal Expansion ◽  
Bolted Joints ◽  
Electric Heater ◽  
Screw Thread ◽  
Bolted Joint ◽  
Finite Element Analyses ◽  
Temperature Changes

Bolted joints have been used in mechanical structures. However, loosening accidents sometimes happen under several types of loadings. Recently, some studies have been conducted on the screw thread loosening in bolted joints. It is verified that bolted joints are loosened when transverse repeated loadings are applied. Some studies on no rotational loosening in bolted joints under thermal changes have also conducted. However, few studies on rotational screw thread loosening in bolted joints have conducted. In this study, rotational screw thread loosening in bolted joint under repeated temperature changes is examined. Effects of the linear thermal expansion coefficient of clamped parts and number of repeated temperature changes are examined by the measurements and finite element analyses. In the experiments, a bolted joint, which consist of two rectangular plates fastened at room temperature by two bolts and nuts, are put in a furnace and heated by an electric heater. Then, the bolted joint is cooled at room temperature. These thermal cycles are repeated. Bolt temperature and bolt load were measured. Loosening is evaluated from the reductions in the bolt load. Finite element analyses were carried out for clarifying the loosening mechanism. Discussion is made on the mechanism of rotational screw thread loosening in bolted joints under repeated temperature changes. The results show that loosening occurs under repeated temperature changes due to difference in the linear thermal expansion coefficients of the different clamped parts.

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