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Mr. P. B. GujaratiM. Tech ( Industrial Process Equipment

Design)

L. D. College of Engineering, Ahmedabad

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Course Content ( Design o !ehicleBodies)

Vehicle Body MaterialsLayout of the DesignPreliminary Design

SafetyIdealized structure and structural surfaceShear Panel Method

Symmetric and asymmetrical vertical loads incarLongitudinal loadsDi erent loading situationsLoad distribution on vehicle structure

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Course Content ( Design o !ehicleBodies)

Calculation of loading casesStress analysis of bus body structure under

bending and torsionStress analysis in integral bus bodyDesign of chassis frame

ules and regulations for bodyecent safety measures

!esting of body

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Design of Vehicle BodiesDesign of body shell involves

Problems of structural analysis *(#+,Sheet metal forming and -elding

(inish sub'grou% involvesPaint and corrosion %rotection

!rim for internal .nish/Sound insulations

#)ui%ment sub'grou% involvesDetails such as door loc0s/ &indo&s/ seats1eating $ ventilationsInstruments

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Body DesignBody design involves

Materials !y%es of loads and Loading conditionsStress +nalysis

Body design must al&ays be guided by

+esthetic considerations * Styling,Com%etition from other manufacturer+erodynamicsCost o%timizatoin

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Vehicle Body Materials"heet "teel#ight $llo%s

PlasticsTe&tilesGlass'u er

oodInsulation Materials

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Vehicle Body Materials

"heet "teel* !hic0ness range" 234 mm to 536 mm * Most

fre)uently used material,Steel ty%e" Lo& Carbon Steel &ith 234 7 C* 8ood &eldability,Cu $ 9i added to increase anti'corrosive

%ro%erties of chromeSheet is obtained by dee% %ressingo%erations3

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Vehicle Body Materials

#ight $llo%s*+luminium +lloys

:sed for both as casting and sheet metal;ther Light alloys

Co%%erMagnesium9ic0el

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Vehicle Body Materials

Plastics

Can be divided into those obtained

fromLarge molecules andPolymerization

#arge Moleculese3g3

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Vehicle Body Materials

;nly Disadvantage " 1ighly in>ammable

+lternate to

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Vehicle Body MaterialsPol%meri+ation*

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Vehicle Body Materials

Te&tiles*

Cotton based fabrics ? traditional

material for internal trim of a vehicleShorter life but absorbs dust $ otherim%urities

9o&adays it is &holly re%laced by%lastic called @Imitation LeatherA

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Vehicle Body Materials

Glass

:sed in &indo&s and doors

Safety glassLaminated&hich disintegrates into small %ieces &ithblunt edges during brea0age3

!rans%arent %lastics

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Vehicle Body Materials

'u ers*Synthetic rubber

esistant to fuel oil:sed in engine com%artment near fueltan03

Seat cushions

1ardness of rubber is measured in I 1D *International ubber 1ardness Degree,#3g3 2 degree I1 D ? very soft rubber

522 degree I1 D ? hardest rubber

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Vehicle Body Materials

ood

:sed before the introduction of %lastics

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Vehicle Body MaterialsInsulating Materials*

Pre're)uisites"Lo& coe cient of thermal conductivity1igh coe cient of vibration dam%ing

But these are di cult to obtainsimultaneously in one materialIf Material &ith included air bubbles/ itdecreases elasticity i3e3 lo& coe cient ofvib3 Dam%ing

ecent materials"Polystyrene/ felt/ :rea (ormaldehyde/%olyurethane