calculating force from strain

[Vindhyachal.takniki]

Is it right way to calculate force from known strain & young modulus :

1. E = stress / strain
from where stress is calculated

2. Then stress = Force/area
From here force can be calculated

3. How to convert this force (in newton) into Kg.

[Andy Watson]

1. Yes
2. Yes
3. Divide by 9.8 (on Earth).

[Vindhyachal.takniki]

1. I have square metal plate of .15m.
2. I was looking at formula , let say how much Kg-force for 1 microstrain
3. material is glass fibre. From below link young modulus of glass fibre is 17Gpa
http://www.engineeringtoolbox.com/young-modulus-d_417.html


Stress = E x strain = 17 * 10^9 * 1 * 10^-6 = 17000
Force = Stress * area = 17000 * .15 * .15 = 382.5

So kg-force = 382.5 / 9.8 = 39.03


1. One microstrain produces 39.03Kg force. Such small strain with such high Kg-f  Is there any mistake in calculation I am doing?
2. My material is glass fibre. Or I have selected wrong young modulus??

[Andy Watson]

Any chance you could draw a diagram? I'm not following what you are trying to achieve.
How are you applying the load? Applying a load through the plate will produce considerably more stress than applying the load as tension. You need to specify how the load is applied and how the plate(s) is supported.