TY  - JOUR
T1  - Numerical Analysis of Thermal Expansion and Nonlinear Distortion Effects on
Performance of Engine Seal under Compressive Loading
AU - Ali Hussein, Rana 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 19
SP  - 7241
EP  - 7247
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.7241.7247
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.7241.7247
KW  - engine and modelling
KW  -nonlinear
KW  -deformation
KW  -thermal
KW  -Abaqus
KW  -distribution
AB  - In internal combustion engines, one of the most critical factors in engine efficiency is the sealing unit.
All mating surfaces should be seal very well by using gasket assembly to keep the closed cycle system during
operation in different environmental conditions and loads operation. The problems of inadequate and
non-suitable gasket selection and also the leakage problems due to the non-uniform load distribution will
diminish the engine pressure and minimize the engine performance and finally to damage the components. The
main objectives of this research are to find out the most effecting factors on the gasket unit performance by
analysis and simulation method. Finite element method under (Abaqus/CAE) code has different solutions for
such types of nonlinear behaviour. Modelling of these complex nonlinear behaviour’s like loading along
contact paths, nonlinear elasticity and plastic distortion are available in Abaqus. It can simplify the components
and in same time the essential elements properties will maintain the nonlinear response. In this research, the
completed assembly model of gasket sealing unit is consist of upper aluminium manifold cover, two bolts, lower
manifold block, paste gasket with silicone bead and base steel plate. These complex geometric parts with
different engineering materials are subject to large amount of compound strains and due to the nature of
materials used in engine gasket, all compressive response will be nonlinear. This nonlinearity will add more
challenge on the modelling and analysis of the whole continuum model. As a results, it’s found that the effects
of thermal expansion and engine pressure will cause some distortion in the assembly unit and will rise the
tighten bolts force to maximum values. Also, the deformation or non-uniform in sealing cover will leads to down
the engine performance. It’s concluded that the stress distribution will be not uniform due to loads and
differences in distortion rate on each individual part. Also, the clamping forces distribution need to be increase
without exceeding the strength of each part.
ER  -