SELECTION OF PARTS

GENERAL DESCRIPTION

Selection of parts:

The parts to be analysed were taken from a from the left side double wishbone suspension assembly of the TATA SUMO GOLD (2007 model).

The specifications of the vehicle are as follows:

Kerb weight of the vehicle	1840 Kg
Weight of vehicle under fully loaded condition	2840 Kg
Wheelbase	2.425 m
Track width	1.496 m
Height of centre of gravity	0.8 m

Taking measurements:

Reverse Engineering was done on the parts to obtain the dimensions so that they could be modelled in the software.
software used is solidworks

LOWER WISHBONE DIMENSIONS:

UPPER WISHBONE DIMENSIONS:

Selection of material:

The material for both the control arms was assumed to be AISI 1045 taking into consideration the strength required for the operating conditions.

Material properties of AISI 1045 are as follows:

Property	Value	Unit
Density	7870	Kg/m3
Co-efficient of Thermal Expansion	1.2x10-5	1/C
Young's Modulus	2.06x105	MPa
Poisson's Ratio	0.29
Bulk Modulus	1.6349x105	MPa
Shear Modulus	7.9845x104	MPa
Strength Co-efficient	413	MPa
Strength Exponent	-0.106
Ductility Co-efficient	0.213
Ductility Exponent	-0.47
Cyclic Strength Co-efficient	808	MPa
Cyclic Strain Hardening Exponent	0.2
Tensile Yield Strength	450	MPa
Compressive Yield Strength	250	MPa
Tensile Ultimate Strength	585	MPa
Compressive Ultimate Strength	300	MPa