Problem involving temp changes in stress and strain topic.

[Nicolesin]

1. Knowing that a 0.5 mm gap exists when the temperature is 20 degree celsius,
Determine the tempature at which the normal stress in the aluminum bar will be equal to -90 MPa,And the corresponding exact length of the aluminum bar.

The Attempt at a Solution

I am not familiar with this topic. Could anyone also show me some of their thing process . Thanks in advance.

 

[SteamKing]

Do you know how much expansion occurs in metals with temperature change?
Hint: it involves alpha.

Do you know how the length of a bar changes when an axial load is applied?