Upload
murugan-raja
View
250
Download
1
Embed Size (px)
Citation preview
8/9/2019 Mechanical Properties - Ppt
1/21
8/9/2019 Mechanical Properties - Ppt
2/21
MECHANICAL PROPERTIES
STRESS & STRAIN DUCTILITY STRENGTH
TOUGHNESS HARDNESS MALLEABILITY
PLASTICITY ELASTICITY DUCTILE BRITTLE
8/9/2019 Mechanical Properties - Ppt
3/21
STRESS & STRAIN
STRESS : An External force ! a""le# to$o#% ten#! to can'e te #(en!on) te$o#% re!!t! te force tat nternal
re!!tance calle# STRESS* STRAIN : Can'e n #(en!on $% te
external force calle# STRAIN*
8/9/2019 Mechanical Properties - Ppt
4/21
8/9/2019 Mechanical Properties - Ppt
5/21
STRENGTH
T! ! te (ax(+( con2entonal !tre!!tat can $e !+!tane# $% te (ateral*
It ! te +lt(ate !tren't n ten!on an#corre!"on#! to te (ax(+( loa# n aten!on te!t*
It ! (ea!+re# $% te 'e!t "ont on tecon2entonal !tre!!-!tran c+r2e* Inen'neern' ten!on te!t! t! !tren't
"ro2#e! te $a!c #e!'n nfor(aton onte (ateral!* Te ten!le !tren't of a (ateral ! te
(ax(+( a(o+nt of ten!le !tre!! tat tcan $e !+$3ecte# to $efore fal+re*
8/9/2019 Mechanical Properties - Ppt
6/21
STRENGTH
Tere are tree t%"cal #e4nton! of ten!le!tren't*
Yield strength Te !tre!! at ,c (ateral !tran can'e!
fro( ela!tc #efor(aton to "la!tc #efor(aton)ca+!n' t to #efor( "er(anentl% ! 5no,n a!yield strength*
Ulti!te strength Te (ax(+( !tre!! a (ateral can ,t!tan#
! 5no,n a! "lti!te strength*#re!$ing strength Te !tren't co-or#nate on te !tre!!-!tran
c+r2e at te "ont of r+"t+re ! 5no,n a!%re!$ing strength*
8/9/2019 Mechanical Properties - Ppt
7/21
TOUGHNESS
To+'ne!! ! te a$lt% to a$!or$ ener'%+" to fract+re /ener'% "er +nt 2ol+(e of(ateral1*
To+'ne!! of a (ateral o$tane# $%
I("act Te!t a! I("act Stren't* I("act !tren't ! te a$lt% of te
(ateral to a$!or$ ener'% #+rn' "la!tc
#efor(aton*
8/9/2019 Mechanical Properties - Ppt
8/21
HARDNESS
Har#ne!! ! a (ea!+re of a (ateral6!re!!tance to local7e# "la!tc#efor(aton*
Re!!tance to "er(anentl% n#entn' te!+rface*
Te (an +!ef+lne!! of ar#ne!! !) t a!a con!tant relaton!" to te ten!le!tren't of a '2en (ateral an# !o can$e +!e# a! a "ractcal non-#e!tr+ct2ete!t *
8/9/2019 Mechanical Properties - Ppt
9/21
HARDNESS TESTMETHODS
Te follo,n' are te ar#ne!! te!t(eto#!
Roc5,ell ar#ne!!
Brnell ar#ne!! 8c5er! Har#ne!! Mcro 8c5er! Har#ne!!
9noo" ar#ne!! Sore
8/9/2019 Mechanical Properties - Ppt
10/21
PROPERTIES
(!lle!%ility te "ro"ert% of a (ateral tatcan $e ,or5e# or a((ere# or !a"e# ,to+t$rea5n'
el!stiity te "ro"ert% of a (ateral tatret+rn! to t! or'nal !a"e after !tre!! /e*'*external force!1 tat (a#e t #efor( or #!tort !re(o2e#
'l!stiity- te #efor(aton of a (ateral+n#er'on' non-re2er!$le can'e! of !a"e nre!"on!e to a""le# force!
8/9/2019 Mechanical Properties - Ppt
11/21
DUCTILE
Exten!2e "la!tc #efor(aton aea# ofcrac5*
Crac5 ! ;!ta$le
8/9/2019 Mechanical Properties - Ppt
12/21
#RITTLE
No a""reca$le "la!tc #efor(aton*
Crac5 "ro"a'aton ! 2er% fact*
8/9/2019 Mechanical Properties - Ppt
13/21
E(UIPMENTS FOR
ANALY)E MECHANICALPROPERTIES
8/9/2019 Mechanical Properties - Ppt
14/21
UNI*ERSAL TENSILEMACHINE
8/9/2019 Mechanical Properties - Ppt
15/21
UTM +!e# to anal%7e $elo, (entone#"ro"erte!
TENSILE STRENGTHYIELD STRENGTH
COMPRESSI8E STRENGTH
DUCTILITY
BEND ANALYSIS PROO. STRESS
8/9/2019 Mechanical Properties - Ppt
16/21
CHARPY IMPACT MACHINE
8/9/2019 Mechanical Properties - Ppt
17/21
I("act Macne ! +!e# to #eter(neTo+'ne!! or I("act !tren't of te
(ateral*
TYPES
CHARPY IMPACT MACHINE
I=OD IMPACT MACHINE
8/9/2019 Mechanical Properties - Ppt
18/21
*IC+ERS HARDNESS
8/9/2019 Mechanical Properties - Ppt
19/21
8/9/2019 Mechanical Properties - Ppt
20/21
R-$.ell H!rdness S!les
Scale Code Load Indenter Use
A HRA 60 kgf 120 diamond coneTungstencarbide
B HRB 100 kgf 1/16 in diameter steel sphere
Al, brass, and
soft steels
C HRC 150 kgf 120 diamond cone Harder steels
D HRD 100 kgf 120 diamond cone
E HRE 100 kgf 1/ in diameter steel sphere
. HR. 60 kgf 1/16 in diameter steel sphere
G HRG 150 kgf 1/16 in diameter steel sphere
8/9/2019 Mechanical Properties - Ppt
21/21
THAN+ YOU