Abstract
In this Work an effort has been designed to raise the reliability of engine using Al-Sic composites with other alternatively materials for the engine valve guides. Aluminum matrix composites have found the most suitable inside automotive, aerospace and aircraft industries and contain the greatest promise for future year’s growth. The finite element analysis of the Al-Sic composite with Titanium alloy (Ti-834), Copper Nickel Silicon alloys (CuNi3Si), and aluminum bronze alloy as an alternative material for engine valve guide was done using Ansys 13.0 software. The stress analysis of engine valve guide under the different pressure and temperature is considered, the pressure is taken as from 10 MPa to 100 MPa with Different temperatures varying from 600 °C to 650 °C. The temperature, principal stress and principal strain distribution on the entire surface area of the engine valve guide were obtained. The stresses were observed to be well below the permitted stress for all the materials but the Al-Sic composites found the most suitable one. Valve guide is modeled in pro-engineer software and analysis is carried out in Ansys 13.0. The deformations and stresses induced due to structural and thermal loading is illustrated and discussed.
Highlights
In reaction to increasing worldwide competition and developing concern for environment the auto manufacturers have already been encouraged to meet up the conflicting demands of increased power and performance, lower fuel consumption, lower pollution emission and reduced vibration and noise
Several function has been documented on the substitution of presently utilized materials by the aluminum matrix composites for various automotive parts viz. piston, cylinder liner, engine valves, valve seat inserts etc
The superimposed rocking motion in addition to the sliding of the engine valve causes high wear at the ends of the valve guide called “bellmouthing”, generally more pronounced in the rocker arm actuation mechanism. These problems call for a high wear resistant material with low coefficient of thermal expansion and engine valve guides based on the Al-SiC composites are expected to provide a better solution
Summary
In reaction to increasing worldwide competition and developing concern for environment the auto manufacturers have already been encouraged to meet up the conflicting demands of increased power and performance, lower fuel consumption, lower pollution emission and reduced vibration and noise. The superimposed rocking motion in addition to the sliding of the engine valve causes high wear at the ends of the valve guide called “bellmouthing”, generally more pronounced in the rocker arm actuation mechanism These problems call for a high wear resistant material with low coefficient of thermal expansion and engine valve guides based on the Al-SiC composites are expected to provide a better solution. 25% heat conducted through valve stem is further conduct through valve guide Due to this impact of hot gases, the temperature at the center of head is maximum about 700 °C and further distributed at various element, nodes and section as shown in figure below. A Solid 10 node 87 element type is used for thermal analysis
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