An Introduction to Stress Analysis and Transducer Design Using Strain Gauges

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The usual way of assessing structural parts of machines, buildings, vehicles, aircraft, etc. is based on strength of material calculations.

This method is satisfactory provided the component loads are known both qualitatively and quantitively. Problems arise particularly where the loads are unknown or where they can only be roughly approximated. Formerly the risk of overloading was countered by using safety margins, i.e. through overdimensioning. However, modern design strategies demand savings in material, partly for reasons of cost and partly to save weight; this is clearly illustrated, for example in aeronautics. In order to satisfy the safety requirements and to provide an adequate component service life, the material stresses must be known. Therefore measurements under operational conditions are necessary.

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