09.Material Lab Report (Lacx) IV

8/10/2019 09.Material Lab Report (Lacx) IV

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1.0 ObjectiveThe objective of this experiment is to study about the Youngs Modulus for the metals andnon-metals. Case of study had included Iron Carbon steel plastic material !polycarbonate"and aluminium bar.

#y conducting tensile test Iron Carbon steel and polycarbonates Youngs Modulus can beobtained. $or the aluminium bar Cantilever bend test %as performed to obtain the YoungsModulus.

2.0 Introduction&ifferent material consists of different mechanical properties due the types of force appliedfor example compression tension or shear. The mechanical properties included YoungsModulus stress strain yield point '.() proof stress and etc. These properties had played animportant role in varies *ind of constructions and can be determine by using tensile test orcantilever bend test.

S" e..

is defined as force !$" per unit cross sectional area !+". It is used to express theforce applied to a certain cross-sectional area of an object. The unit of stress is !, m " or

called /ascal !/a". $ormula of the stress is = F A

S" a!n is the change of length of the original length. It is the response of a system to

an applied stress. $ormula of strain is = l

l 0

Y!e4# -o!n" is the point %here the materials stop to deform elastically and begin to deform plastically. It is also called yield stress. The value of yield stress can be obtained in thestress-strain curve.

Yo ng5. mo# 4 . or called modulus of elasticity !0" is the slope of stress-strain graph. Theunit of Youngs modulus is same as the unit of stress !, m " or called /ascal !/a". $ormula

of Youngs Modulus is E= =

F l 0 A l

0 26 - oo7 8a4 e is the stress at %hich noticeable !'.() offset" plastic deformation hasoccurred.


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< = !d 12 " (

< = !

5.45

2 "(

< ((.:'mm (

Ta%4e 3 2 2 Ten.!4e "e." e. 4" o7 I on Ca %on S"ee4 Ro#

>oad $ !*," 0xtension x !mm" 2tress !M/a" 2train !

10 1

"

'.'' '.'' '.'' '.''(.'' 1.(' (;.(( '.145.'' 5.;' 67.54 '.61;.'' 9.(' 11(.;9 '.97

1(.'' :.'' 17:.4' '.:617.'' :.7' ((6.94 1.'1('.'' :.:' (;(.1; 1.'5(7.'' 1(.'' 477.;( 1.(7(9.6' 15.'' 4;9.:; 1.59(7.6' 17.(' 494.;9 1.91(;.'' 19.5' 4:6.'4 1.;4

4(.'' ('.6' 561.5; (.1745.'' (5.'' 59:.7; (.6447.'' 4'.'' 6'9.:' 4.174;.'' 5(.'' 647.1( 5.5(49.9' 64.'' 641.;; 6.6;4'.'' 67.;' 5(4.(6 6.:;

$or example

$or load $ < ( *, elongation x < 1.(mm

2tress < (''' 9'.;;

< (;.(( M/a

2train < 1.( :6

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Ma;!m m 4oa#


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S" e.. MPa 4;9.:;S" a!n mm(mm '.159Yo ng5. mo# 4 . GPa (.75

Yield point stress ? < Force applied at yield point ( N )

Original crosssectional area (mm 2 )

oad applied !*g"

g < :.;1 !m s ( "

l < 0ffective length of specimen !m"

d < &eflection !m"

% < Didth of specimen !m"

t < Thic*ness of specimen !m"

Aradient < M d

M d < Aradient

#o =o n#e ."an# "9e 0 26- oo7 4oa# 7o ! on /a %on ."ee4The '.() proof load for iron carbon steel is the load %here steel started to deform

plastically. It %as dra%n '.() offset from the strain.

.0 ConclusionYoungs modulus of iron carbon steel

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09.Material Lab Report (Lacx) IV