Dear Vithal Rao Chauhan,

Method or Procedure of of Tensile Testing:

There are 3 methods or ways to carryout tensile test:

1. Constant Rate of Extension (CRE):-

Rate of increase of specimen length is uniform with time (the load measuring mechanism moves a negligible distance).

It is possible in constant rate of elongation tests for load to decrease while elongation increases.

2. Constant Rate of Loading (CRL):-

Rate of increase of the load is uniform with time and rate of extension is dependent on the load-elongation characteristics of the specimen.

It is not possible in constant rate of loading tests for load to decrease. Load must increase all the time.

3. Constant Rate of Traverse (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.

CRE and CRL type of instruments are preferred for accurate scientific work and it is easy to adjust the "time-to-break" while this adjustment is not easy in the CRT types of instruments.

CRE V/S CRL:

• With CRE principle, maximum load reaches before 3 sec., and rest of the time the specimen remains at higher load (initially very high rate of loading).
• For CRL, initial extension was very low and afterwards very high extension with small time (very high extension rate)
• So, nature of the curves of same specimen under two different principles will be different.
• If specimen length increase in a CRE machine, the rate of loading will decrease.

The fundamental criteria which affect the compatibility between different measurements of tensile yarn properties are testing conditions, the testing principle(CRE, CRL), testing speed, gauge length, and pre-tensioning, etc.

I hope I have answered your question.

With Best Wishes,

Samir G. Pandya

Please see:

ASTM D3822 / D3822M - 14

Hello Chauhan,

There is a dedicated standard for tensile testing of natural fibers.

This might help you in determining the properties. You need to test a large sample group to attain a good result.

regards

Anurag

Single fiber tensile testing

You can test the tensile test of fibers by ASTM D 3822 method.

You should consider that natural fibers generally have defects along the fiber axis. Therefore the measured tensile strength depends on the length of the fiber, i.e. the distance between the grips. To account for this you should make tests with different clamping length'. In order to get representative values you should of course make make series of measurements.

Can you try the method described in the attached figure? I miss the detailed reference for the method. I will send it to you after I find it.

You can test the tensile test of fibers by ASTM D 3822 method.

SFTT (Single Fiber Tensile Test) is suitable test method for your problem........

Please read this paper.

You can use single fibre tensile testing method.

Please go throug this paper.

Borassus and Tamarind Fruit Fibers as Reinforcement in Cashew Nut Shell Liquid-Epoxy Composites

Dear researcher

You can test the tensile test using single fibre tensile testing method. Moreover you can find the tensile strength of fibre by using rule of mixture after making a composite by the fibre.

You can use single fiber tensile test... Depend on length of original fiber... Minimum measure length among the grips about 10 mm..

Please read this paper https://www.sciencedirect.com/science/article/pii/S0144861717307038

Most of the textile industry used to perform this test i.e yarn test. The same can be used for single natural fiber also. Very simple test only

Testing of natural fiber materials with Universal testing mechine study for mechanical characteristics

MTS Criterion40 universal testing machine (MTS Systems Corporation, USA).

please refer my paper.

1.V. Manikandan, R.Velmurugan, S.G.Ponnambalam, Sabu Thomas, Mechanical properties of short and uni -directional aligned Palmyra fiber reinforced polyester composite. Int.J. of Plast.. Tech vol8, 205-216(2004)

You can refer this web page

https://www.azom.com/materials-video-details.aspx?VidID=1405

Tensile tests on natural fibers are done by individual fiber. there is an effect of length. the major problem is the determination of the section of the broken fiber. for that there are several techniques 1) measure by density 2) measurement by microscopy and image processing if the dispersion of the values ​​is greater than 10 percent, a statistics analysis is indispensable (Weibull)

Dear Sir,

Please kindly go through this paper.

https://www.sciencedirect.com/science/article/pii/S0144861718314152

A former colleage developed a method to measure the strain of the fibers optically to determine a more accurate Young's modulus. The fiber diameter is also determined by a laser at multiple positions. You can find the publications here:

https://iopscience.iop.org/article/10.1088/1361-6501/aaa0bb/meta

He's still at the same institute, so feel free to contact him if you have any questions.