calculating 0.2% proof stress of aluminium


by cmgames
Tags: aluminium, proof, stress
cmgames
cmgames is offline
#19
Jan2-08, 01:53 PM
P: 12
i see your point however i am basing my calculations on what one of my lecturers emailed me~:~

"If, for example, your horizontal axis shows 5.0mm of extension, and you measure this as being say 220mm, it follows that 1mm in reality is represented by 44mm on your axis (220 divided by 5)

Now multiply 0.2% of gauge length by 44 to obtain the amount of offset "
stewartcs
stewartcs is offline
#20
Jan2-08, 02:00 PM
Sci Advisor
stewartcs's Avatar
P: 2,283
Quote Quote by cmgames View Post
i see your point however i am basing my calculations on what one of my lecturers emailed me~:~

"If, for example, your horizontal axis shows 5.0mm of extension, and you measure this as being say 220mm, it follows that 1mm in reality is represented by 44mm on your axis (220 divided by 5)

Now multiply 0.2% of gauge length by 44 to obtain the amount of offset "
I don't see the point in scaling the graph down to a smaller scale. I must be missing something. Sorry I couldn't help more.

CS
dewking
dewking is offline
#21
Mar28-08, 11:59 PM
P: 1
i thought the graph should be stress-strain graph? why is it force-elongation graph? is it the same/?
Skip-Pen
Skip-Pen is offline
#22
Apr4-11, 06:13 AM
P: 1
Quote Quote by dewking View Post
i thought the graph should be stress-strain graph? why is it force-elongation graph? is it the same/?
Stress is Force/Original Area
Strain is Elongation/Original test piece Length

The two graphs are not the same, but the shapes are identical, as the original area and original length are constant.

But that is a good point, why isn't your graph a Stress-Strain one?


Register to reply

Related Discussions
Vonmises Stress Vs Maximum Principle Stress Mechanical Engineering 6
Stress-energy tensor of a wire under stress Special & General Relativity 178
Calculating Shear Stress Engineering, Comp Sci, & Technology Homework 3
Proof of calculating area and volume General Math 31
Stress @ Proportional Limit, Ultimate Stress, Breaking Stress, etc. General Physics 0