You are Here: Home >< Physics

# Stress/strain graph of copper past its elastic limit Watch

1. Does the graph of D imply that the material can undergo elastic hysteresis, and therefore it is wrong because copper does not undergo elastic hysteresis? Or is B the answer because the graph of D curves a lot more than B, and therefore the strain wouldn't decrease when the stress is removed?
2. (Original post by originaltitle)

Does the graph of D imply that the material can undergo elastic hysteresis, and therefore it is wrong because copper does not undergo elastic hysteresis? Or is B the answer because the graph of D curves a lot more than B, and therefore it wouldn't be able the strain wouldn't decrease when the stress is removed?
I believe that a hysteresis loop starts and ends at the origin like so:
http://www.diracdelta.co.uk/science/...s/image001.gif
3. I think answer is A because stress-strain diagram is real function diagram i.e strain is independent variable and stress is dependent variable and in real valued functions independent variable gives only unique(i.e single value) value of dependent varialvle ,as in all three i.e B,C,D strain gives multiple values for single strain
4. (Original post by priyanshmishra)
I think answer is A because stress-strain diagram is real function diagram i.e strain is independent variable and stress is dependent variable and in real valued functions independent variable gives only unique(i.e single value) value of dependent varialvle ,as in all three i.e B,C,D strain gives multiple values for single strain
Here's the textbook diagram:

If you remove the stress at C the material returns to O'

Which answer do you think is correct.
5. its B. A describes the energy required to stretch the wire. C cannot be the answer as the wire will want to unstretch back the way it did, so it will take the linear straight part. with D, it won't curve back once you have passed the elastic limit (limit of proportionality) of the wire. instead you can think of it as if the wire has a new youngs modulus. youngs modulus' are found by finding the gradient of the linear line of stress over strain. therefore when the wire is unstretching, it will take a linear path not a curved one- A.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 4, 2017
Today on TSR

### Best unis for graduate salaries

Half of the top 10 aren't even RG...

### My alarm went off in an exam!

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE