Bi metal strip

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Amol Madhav KhatkhateR. T Mirchandani. A parametric approach has been used to derive an approximate formula for the prediction of the radius of curvature of a thin bimetallic strip that at initial ambient temperature, is both flat and straight, but at above ambient temperature, forms into an arc of a circle.

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This website uses cookies to function and to improve your experience. By continuing to use our site, you agree to our use of cookies. This is a conceptual model illustrating how to couple fluid-structure interaction, heat transfer, and thermal expansion.

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Assume that it bends into an arc when heated. Substances expand when we increase their temperature. Different substances expand differently, that is why there will be the difference in the length of the two strips. As long as the strips are firmly rivetted together so that they cannot move along each other, they will bend.

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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 copperor in some cases steel and brass. The strips are joined together throughout their length by rivetingbrazing or welding.

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Have you ever noticed that there are tiny gaps in rails and flyovers? They are designed that way to prevent the matter from bending or breaking in summer when it expands. Matter always expands, or becomes bigger, when it is heated. This is called thermal expansion.

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For many industrial and manual applications, such as sawing, cutting, punching and stamping, perforating, folding and creping, success ultimately depends on the quality of the edge. As an example, the whole saw does not need to be manufactured from the hardest steel because it is only the teeth that do the sawing. We weld specialty steels with an annealing hardness of up to 1, HV.

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It is at the atomic level that we must seek the explanation of the thermal expansion of matter. The thermal energy contained in the atoms is expressed in the form of a vibration around their average position. This vibration depends on the temperature and the neighboring atoms.

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