# Thermal Stress

on . Posted in Thermodynamics

Thermal stress, abbreviated as $$\sigma_t$$ (Greek symbol sigma), is the change in the temperature of the material that causes expansion or contraction.  The change in length is porportional to the amount of heat applied.

## thermal Stress formula

$$\large{ \sigma_t = \alpha \; E \; \Delta T }$$
Symbol English Metric
$$\large{ \sigma_t }$$  (Greek symbol sigma) = thermal stress $$\large{\frac{lbf}{in^2}}$$  $$\large{Pa}$$
$$\large{ E }$$ = elastic modulus $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$
$$\large{ \Delta T }$$ = temperature differential $$\large{F}$$ $$\large{C}$$
$$\large{ \alpha }$$  (Greek symbol alpha) = thermal expansion coefficient $$\large{\frac{in}{in-F}}$$ $$\large{\frac{mm}{mm-C}}$$