00:02
Hi, in this question, the initial temperature t1 of the steel rod is given as 25 degrees celsius.
00:10
The final temperature t2 of the steel rod is given as 150 degrees celsius.
00:21
The modulus of elasticity of the material, that is steel, is given as 200 giga -pascal.
00:29
Then the coefficient of linear expansion alpha is given as 11 .7 into 10 to the power minus 6 per degree celsius.
00:45
Then the heat stress sigma y is given as 250 megapascal.
00:55
These are all the data given.
00:57
We need to determine the stress in the steel rod and deflection of the steel rod.
01:01
Now the deflection of the steel rod can be written as delta l is equal to alpha delta t l minus p l by a e where this p is the load acting at the supports and l is the length of the rod, a, dore is the cross -section area of the rod and e is the model a suburb.
01:32
Velocity since both the ends are supported we can write this as alpha delta t is equal to sigma y by e again this can be modified as delta t is equal to sigma y by alpha times e now let us plug the given values and determine the temperature rise at which the yield stress begins.
02:13
Heel stress is given as 250 megapascal delta t is equal to 250 into 10 to the power 6 divided by 11 .7 into 10 to the power minus 6.
02:38
Multiply with 200 into 10 to the power 9...