Three bars each made of same material are connected together and placed between two walls when temperature is T1 = 12°C. (a) Determine the temperature in which the first element yield (Tyield)  (b) Increase further temperature from the obtained Tyield by further 50°C degrees, then determine the distance of Point B from two walls and the thermal stress generated in each bars. The material properties and cross-sectional area of each bar are given in the figure

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Temperature Difference and Heat Transfer

Whenever there is a flow of heat flux resulting from a temperature gradient within the material or between two materials, there is heat transfer. Heat transfer primarily arises due to temperature differences between two bodies or within bodies. The term temperature gradient denotes temperature differences or variation of temperature due to change in some quantity. The fundamental use of the concept of temperature is found in the zeroth law of thermodynamics.