Specific features of strain measurement in composite materials

Effect of some characteristic features of products made of composite materials on the strain measurement is considered. The features analyzed include a considerable surface roughness, high anisotropy of rigid characteristics and thermal expansion coefficients, and a low heat conductivity of the composite materials. On the basis of analysing some dependences and experimental data, as well as using the extensive experimental experience of the investigators, recommendations are suggested for reducing drastically the probability of systematic errors arising in measuring the strain of composite materials with the help of strain gauges.