8/9/2019 EXP3 (2)

1/9

EXPERIMENT NO. 3BEND TEST OF REINFORCING STEEL BARS

Objectives:

To determine the ultimate strength of the reinforcing steel bars when subjected to bending

load.

To examine the reinforcing steel bars physical conditions.

Discussio o! P"ici#$es:

The bend test is one method for evaluating ductility, but it cannot be considered as aquantitative means of predicting service performance in bending operations. The severity of the bendtest is primarily a function of the angle of bend and inside diameter to which the specimen is bent,and of the cross section of the specimen. These conditions are varied according to location andorientation of the test specimen and the chemical composition, tensile properties, hardness, type andquality of the steel specified. Method E1! and Test Method E"! may be consulted for methods ofperforming the test.

#nless otherwise specified, it shall be permissible to age bend test specimens. The time$temperature cycle employed must be such that the effects of previous processing will not be such thatthe effects of previous processing will not be materially changed. %t may be accomplished by aging atroom temperature "& to &' h, or in shorter time at moderately elevated temperatures by boiling inwater, heating in oil, or in an oven. (end the test specimen at room temperature to an insidediameter, as designated by the applicable product specifications, to the extent specified without majorcrac)ing on the outside$ of the bent portion. The speed of bending is ordinarily not an importantfactor.

*+ifted from merican -ociety for Testing and Materials /!, page 10/ -ection 1&.l$1&

8/9/2019 EXP3 (2)

2/9

8/9/2019 EXP3 (2)

3/9

PROCED%RES

Tic) each step if it has been

1.! reparation

1.1 repare two 2"3 both plain and deformed round bar specimen approximately 14!mm in

length.

1." 5etermine the weight of each specimen.

1. 5etermine the actual cross sectional area of each specimen.

1.& 5etermine the average space of lugs.

1.4 5etermine the average height of lugs.

1.0 5etermine summation of gaps.

6ote7 8or deformed bars only.

".! (ending Test refer to ppendix 9 : 5.

.! hysical nalysis

.1 Examine carefully the bent portion for any sign of crac)ing on the outside bend.

6ote7 Transverse of longitudinal crac)s will appear on the bar after bending test.

APPARAT%S

1. -himad;u #niversal Testing Machine #

8/9/2019 EXP3 (2)

4/9

8/9/2019 EXP3 (2)

5/9

E&iee"i& M'te"i'$s '( Testi& L'bo"'to")

E*#e"i+et No: 3

BEND TEST OF REINFORCING STEEL BARS

P"e$i+i'") D't' S,eet

N'+e:Elento, Marwin 9layton >ohn -. D'te: ?ct. 1/, "!1&

Sectio: (1 G"ou# No:

Stee$ B'" C$'ssi!ic'tio De!o"+e( P$'i

+ength of -pecimen, 2mm3 1/ mm 10 mm

=eight of -pecimen, 2)g3 !."0 )g !.4" )g

6ominal 5iameter, 2mm3 14./! mm 10.&0 mm

6ominal 9ross$sectional rea, 2mm"3 1..4 mm" "1"./ mm"

verage

8/9/2019 EXP3 (2)

6/9

8/9/2019 EXP3 (2)

7/9

Re!e"eces:

1. http7www.metengr.com(end.htm". http7www.answers.comsearchFqGcold$bending. http7www.funqa.comengineering1'$Engineering$&.html

&. http7www.twi.co.u)technical$)nowledgejob$)nowledgebend$testing$!/

http://www.metengr.com/Bend.htmhttp://www.answers.com/search?q=cold-bendinghttp://www.funqa.com/engineering/189-Engineering-4.htmlhttp://www.twi.co.uk/technical-knowledge/job-knowledge/bend-testing-073/http://www.answers.com/search?q=cold-bendinghttp://www.funqa.com/engineering/189-Engineering-4.htmlhttp://www.twi.co.uk/technical-knowledge/job-knowledge/bend-testing-073/http://www.metengr.com/Bend.htm

8/9/2019 EXP3 (2)

8/9

MAPUA INSTITUTE OF TECHNOLOGYSchool of Mechanical and Manufacturing Engineering

Engineering Material and Teting

E!PE"IMENT NO# $%end Tet of "einforcing Steel %ar

Elento& Mar'in Cla(ton )ohn S#MfgE * ++,-+-.,//$ME-$/P * %-0ate of Perfor1ance2 Oct# -3& +,-.0ate of Su41iion2 Oct# $-& +,-.

Ferdinand T# Galera& PMEINSTRUCTOR

SCO"E

8/9/2019 EXP3 (2)

9/9

TABLE OF CONTENTS

Objective 3

Discussion of Principes 3

Fe!ure Test Setup "

Proce#ures $

App%r%tus $

Set&Up of App%r%tus '

D%t% S(eet )

Ans*er to +uestions ,

S%-pe Co-put%tion .

Discussion /0

Concusion // References /1