Abstract
The heterogeneous nature of textile composites on the microstructural scale leads to variation in the local strain field within the unit cell. This variation can result in inaccurate measurement of the average global strain when using strain gages of insufficient size. A statistical model for sensor error is presented which leads to expressions for sensor variance. The model includes the effects of unit cell size, gage length, gage width, microstructural defects and irregularities, and instrument error. The proposed model is verified experimentally by using a plain woven-graphite-epoxy composite material and strain gages of various lengths. The experimental results are compared with analytical predictions. A set of guidelines is given for the use of strain gages on textile composites.
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