This presentation is about the tensile testing of Textile and in this presentation Tensile testing definition, principal about spicemen all things are clearly written.

1.  Tensile testing is form of tension testing which is
used to find out how strong a material is also how
much it can be stretched before its break.
 Force is applied parallel to the axis of material.

2.  PRINCIPLE OF TENSILE TEST SPECIMEN.
 SPECIMEN LENGTH.
 RATE OF EXTENSION AND TIME TO BREAK.
 PREVIOUS HISTORY OF SPECIMEN.
 TEMPRATURE AND RH.
 CLAMPING PROBLEM.
 CAPACITY OF MACHINE.
 FORM OF THE SPECIMEN

3. Three ways to carry out Tensile test:-
 CRE:- Rate of increase of specimen length is
uniform with time(the load measuring mechanism
moves a negligible distance).
 CRL:- Rate of increase of the loads is uniform with
time and rate of extension is dependent on the
elongation characteristics of the specimen.

4. CRT:- Pulling one clamp at a uniform rate
and the load is applied through the other
clamp. Which moves appreciably to actuate
a load measuring mechanism so that the
rate of increase of either load or elongation
is usually not constant.

5. FIG: CRE PRINCIPLE

6. Fig: CRL PRINCIPLE

7. Fig: CRT PRINCIPLE

8. •SPECIMEN LENGTH
•As the gauze length increases the breaking
strength decreases due to weak link effect due
to irregularity in textile materials.
•The more irregular the material is, the
greater will be this effect.
•From a processing point of view a yarn with
a slightly lower mean strength but of greater
uniformity is preferable to a yarn of higher
mean strength but irregular .

9. •RATE OF EXTENSION AND TIME TO
BREAK:-
•Increase in breaking strength with increase
in rate of extension with decrease in
extension due to viscoelastic nature of the
textile material-different materials respond
to rate of extension differently.

10. • PREVIOUS HISTORY OF SPECIMEN:-
•Already strained to maximum – greater than
yield point .
•It will show different results.
•Chemical treatment,' too, may also affect the
tensile properties of the specimen. Damage to
the fiber by chemical attack can cause serious
tendering of the fibre

11. • TEMPRATURE AND RH
•High temperature degradation.
•RH changes moisture in sample.
•Standard testing condition- 20C and 65%
RH.

12. • CLAMPING PROBLEM:-
•Suitable clamps for fibre ,yarn fabric.
•Jaw slippage (low clamping pressure) or jaw
damage (high clamping pressure) may occur.

13. •CAPACITY OF THE MACHINE:-
•If a very weak specimen is tested in a machine
with very high capacity, the time to break will be
short, so optimistic result will be produced. Also
the break of the specimen should not be at the
extreme of the instrument capacity.

14. • FORM OF THE SPECIMEN:-
•The specimen under test may be a bundle of
fibers yarn or fabric.
•The tenacity of the longer and liner fibers is
generally found higher than that of the coarse
short fibers.
•The tenacity of single fibers is generally higher
than the tenacity from a test on a bundle of fibers