A bimetallic strip is made up of metal A and B, having different thermal expansion co-efficient. It is bonded together. All metals change in dimension, that is expand or contract when there is a change in temperature. The rate at which this expansion or contraction takes place depend on the temperature co-efficient of expansion of the metal and this temperature coefficient of expansion is different for different metals. Hence the difference in thermal expansion rates is used to produce deflections which is proportional to temperature changes.
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A bimetallic strip is used to convert a temperature change into mechanical displacement. The strip consists of two strips of different metals which expand at different rates as they are heated, usually steel and copper , or in some cases steel and brass. The strips are joined together throughout their length by riveting , brazing or welding. The different expansions force the flat strip to bend one way if heated, and in the opposite direction if cooled below its initial temperature. The metal with the higher coefficient of thermal expansion is on the outer side of the curve when the strip is heated and on the inner side when cooled.
Bi-metallic strips are subject to bending due to heat - and can be used to convert change in temperature to mechanical displacement. Bending occurs towards the side of the metal with the lowest temperature coefficient of expansion. Assuming two metals with the same shape joined together - bending of a bi-metal strip due to change in the temperature can be calculated as. The bending can be calculated as.