A strain grid is a precision sensing element in strain gauge assemblies that converts mechanical deformation into measurable electrical resistance changes for stress analysis.
A strain grid is the core sensing component of a strain gauge, consisting of a fine metallic foil or wire pattern bonded to a flexible backing material. When subjected to mechanical strain, the grid's electrical resistance changes proportionally to the applied deformation, following the principle of piezoresistivity. This component is essential for converting physical stress into quantifiable electrical signals in structural testing, load monitoring, and material analysis applications.
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The strain grid is specifically the sensing element (the foil pattern), while a complete strain gauge includes the grid plus backing material, bonding adhesive, protective coating, and lead wires.
Temperature changes cause apparent strain due to thermal expansion differences between the grid material and test specimen. Constantan and Karma alloys minimize this effect through low temperature coefficients of resistance.
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