### TO DETERMINE THE TENSILE TEST ON STEEL

AIM
To determine tensile test on a metal.

OBJECT

To conduct a tensile test on a mild steel specimen and determine the
following:

(i) Limit of proportionality (ii) Elastic limit
(iii) Yield strength (IV) Ultimate strength
(v) Young’s modulus of elasticity (VI) Percentage elongation
(vii) Percentage reduction in area.

APPARATUS

(i) Universal Testing Machine (UTM)
(ii) Mild steel specimens
(iii) Graph paper
(iv) Scale
(v) Vernier Caliper

PROCEDURE

1) Measure the original length and diameter of the specimen. The length may either be length of gauge section which is marked on the specimen.with a preset punch or the total length of the specimen.
2. Insert the specimen into grips of the test machine and attach strain-measuring device to it.
4. Take readings more frequently as yield point is approached.
5. Measure elongation values with the help of dividers and a ruler.
6. Continue the test till Fracture occurs.
7. By joining the two broken halves of the specimen together, measure the final length and diameter of specimen.

OBSERVATION

A) Original dimensions
Length = ------------
Diameter = ---------
Area = --------------
B) Final Dimensions:
Length = -------------------
Diameter = -----------------
Area = ------------------------

OBSERVATION TABLE

 S.NO LOAD(N) ORIGINAL GAUGE LENGTH EXTENSION(mm) STRESS=LOAD/ AREA (N/mm2) STRAIN=CHANGE IN LENGTH /ORIGINAL LENGTH 1 2 3 4 5

(i) Limit pf proportion
(ii) Elastic limit = load at elastic limit N/mm2
Original area of c/s
(iii) Yield strength
(iv) Ultimate strength
(v) Young’s modulus, E -= stress below propornality limit N/mm2
(vi) Percentage elongation
(vii) Percentage reduction in area

RESULT

i) Average Breaking Stress =
ii) Ultimate Stress =
iii) Average % Elongation =

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