Stresses produced due to change in temperatures(Rise/Fall) are called as thermal stresses
Actual meaning of coefficient of thermal expansion is strain produced per unit change in temperature
Unit of Coefficient of thermal expansion = per degree celcius
Coefficient of thermal expansion for different materials
⚡ Aluminium = 24 x 10^(-6)
⚡ Copper = 17.5 x 10^(-6)
⚡ Steel = 12 x 10^(-6)
Higher the value of coefficient of thermal expansion, more will be the material sensitive for temperature change
For the bar free to expand, with change in temperature (rise/fall), no stress is developed
Prismatic bar with rigidly supported at both ends
⚡ As temperature increases, compressive stresses are developes on bar
⚡ As temperature decreases, tensile stresses are developes on bar
Copper bar is in series with steel bar
⚡ As temperature increases, compressive stresses are developed on both copper and steel bar
⚡ As temperature decreases, tensile stresses are developed on both copper and steel bar
Copper plate is in parallel with steel plate and form a composite
⚡ As temperature increases, compressive stress developed on copper and tensile stress developed on steel
⚡ As temperature decreases, tensile stress developed on copper and compressive stress developed on steel
Copper rod is enclosed in steel tube and both are rigidly fixed at ends
⚡ As temperature increases, Compressive stresses are developes on both copper and steel
⚡ As temperature decreases, tensile stresses are developes on both copper and steel
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