A solid square bar of cross-sectional dimensions
50mm
x
50mm
is attached rigidly to the wall at point A and has a gap of
1mm
from the rigid wall at point B at
25
"^{\\circ}C"
.
Knowing the bar is made of aluminum
(
E=
70 GPa
,
"{\\alpha}"
=
"23\\times10^{-6} /^{\\circ}C"
):
1. At what temperature does the gap close?
2. What stress exists in the bar at a temperature of
100
"^{\\circ}C"
?