Force / extension graph

SoSolid · 30 May 2006 at 22:57

I have looked online but cannot find much in the way of a force against extension graph for steel. Can anyone provide me with any insight as to what this should look like.

shimy182 · 30 May 2006 at 22:58

straight line up till a certain point then rate of extention goes shooting off.

EDIT> let me check my revision book

ye im right

jamoor · 30 May 2006 at 22:59

its how much the steel streches when force is applied to it,
related to hookes law.

shimy182 · 30 May 2006 at 23:00

jamoor said:
its how much the steel streches when force is applied to it,
related to hookes law.

what he says... its proportional. up till the elastic limit

SoSolid · 30 May 2006 at 23:06

Thanks guys, do you have a graph of what the bit after the limit of proportionality looks like?

jamoor · 30 May 2006 at 23:10

SoSolid said:
Thanks guys, do you have a graph of what the bit after the limit of proportionality looks like?

itll snap soon after.

SoSolid · 30 May 2006 at 23:12

ah damn, had an exam and drew a stress / strain graph. Well that's 6 marks down the pan.

KaHn · 30 May 2006 at 23:16

Like that

KaHn

/ph33r my l337 paint skills

JonC · 30 May 2006 at 23:44

Kinda like above, but where the peak is there will be a more marked peak (quite sharp), after which there will be a short elastic region (depending on the amount of carbon etc), followed by a break (where the steel breaks).

jonc

KaHn · 30 May 2006 at 23:46

JonC said:
Kinda like above, but where the peak is there will be a more marked peak (quite sharp), after which there will be a short elastic region (depending on the amount of carbon etc), followed by a break (where the steel breaks).

jonc

Yeah like i said my paint skills rock

KaHn

SoSolid · 2 Jun 2006 at 11:17

Is a stress / strain graph the same as a force / extension graph? I think it is. Stress is the force per unit are applied at right angles to that area, whilst strain is the extension per unit length. So they are the same thing are they not?

Wryel · 2 Jun 2006 at 11:20

SoSolid said:
Is a stress / strain graph the same as a force / extension graph? I think it is. Stress is the force per unit are applied at right angles to that area, whilst strain is the extension per unit length. So they are the same thing are they not?

No, IIRC you divide the two to get some other figure for the material. Its been a long time...

SoSolid · 2 Jun 2006 at 11:49

KaHn said:
Like that

KaHn

/ph33r my l337 paint skills

I basically drew something similar to this, is the right?

Vonhelmet · 2 Jun 2006 at 12:11

Wryel said:
No, IIRC you divide the two to get some other figure for the material. Its been a long time...

The symbol for it is a big E... oh man, what's it called...

Young's Coefficient?

jezsoup · 2 Jun 2006 at 12:15

vonhelmet said:
The symbol for it is a big E... oh man, what's it called...

Young's Coefficient?

Close Youngs Modulus!

jezsoup · 2 Jun 2006 at 12:19

Just remembered this site from some of my uni work

http://engm01.ms.ornl.gov/StressStrain.html

Put in the composition and it will draw the graph for you! Its amazing all my practicals I got near perfect results