• Support PF! Buy your school textbooks, materials and every day products Here!

Thermal stress

  • Thread starter jsalapide
  • Start date
  • #1
40
0
Steel train rails are laid in 10m long segments placed end-to-end. The rails are laid on a winter day when the temperature is -10 degrees Celsius.

a. if the rails are originally laid in contact, what is the thermal stress on them on a summer day when their temperature is 35 degrees Celsius?

b. To prevent thermal stress during summer, what minimum gap between rails must be left when they are originally laid?

my answer in (a) is -3.6x10^7

my answer in (b) is 1.8x10^-3

am i correct?
 

Answers and Replies

  • #2
142
0
Do you have any work to back those answers up?
 
  • #3
40
0
sorry it was the wrong one..

i resolved it and:

a. the young's modulus for steel is 20x10^10 and its coefficient of linear expansion is 1.2x10^-5..
i used the formula (F/A)=-(coefficient of linear expansion)(young's modulus)(delta T)
F/A is the thermal stress..
my answer is -1.08x10^8..

b. i just used the formula delta L=(coefficient of linear expansion)(original length)(delta T)

my answer is 5.4x10^-3 m

is that correct?
 

Related Threads for: Thermal stress

  • Last Post
Replies
3
Views
5K
  • Last Post
Replies
0
Views
3K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
10
Views
12K
Replies
4
Views
2K
Replies
4
Views
6K
Replies
3
Views
2K
Replies
29
Views
11K
Top