This dissertation investigates the thermal stress and thermal expansion develops in a brake drum of heavy commercial truck due to temperature distribution in severe braking condition. The analysis is done by simulate the temperature distribution and the thermal stress distribution within the drum material using finite element approach in ANSYS simulation program

Thaweesak Hemchi, Thaweesak

English

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Thermal stress and Thermal expansion in a brake drum of heavy commercial truck

Brake system is one of crucial system in automobile. Poor performance or brake

failure will cause fatal accident especially for heavy transportation vehicle.

Excessive thermal stresses may canse undesirable effects on the material of brake

drum that eventually lead to the initiation of a crack. This dissertation investigates

the thermal stress and thermal expansion develops in a ~rake drum of heavy

commercial trnck due to temperature distribution in severe braking condition. The

analysis is done by simulate the temperature distribution and the thermal stress

distribution within the drum material nsing finite element approach in ANSYS

simulation program. Before the simulation work, dynamic of moving truck and

rotating drum are analyzed. Also, the energy conversion analysis is made to

determine amount of frictional heat flux created, which the values will be applied in

the simulation input for the temperature distribution. And the temperature

distribution result will be applied in the structural analysis field as the input for

thermal stress and expansion analysis. The simulation results give the highest

temperature of 255T at the middle of braking period which is 2.6 second. The

maximum thermal stress result is achieved 93 MPa at 1.32 second after braking

started and the maximum thermal expansion is achieved in radial expansion of 2.9

millimeter at 2.6 second of braking period. The evaluation of simulation results give

the information for prediction and contribute toward improving design, modeling

and analysis technique for integrity of thermo-mechanical system that subjected to

high temperature

HEMCHI, THA WEESAK