A strain gauge is a sensor used to measure the amount of deformation or strain experienced by an object when subjected to stress. This small device works on the principle that a material's electrical resistance changes when it is stretched or compressed, allowing for precise monitoring of strain in structures like shafts. In the context of torsional vibration of shafts, strain gauges play a crucial role in assessing how these components respond to twisting forces, providing valuable data for analysis and design.
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