The article discusses a piezo actuator information-measuring system for the study of composite filling materials, which implements tensometric control of specimen. The mathematical model of the specimen deformation process has been developed and investigated. This model allows calculating a refined elastic modulus, considering the influence of the compliances of the foil strain gauge and the adhesive layer. The following are used as input data: the force applied to the specimen, the strain gauge absolute deformation, the sizes of the adhesive layer and strain gauge sensitive grid. The theoretical research has demonstrated that the adhesive layer and the strain gauge increase the measured elastic modulus value of filling materials. Therefore, it is necessary to correct the obtained experimental results. The expression is given that makes it possible to calculate the elastic moduli of the adhesive layer and strain gauge using reference specimens. It is recommended to use two specimens with different elastic modulus and different adhesive thickness.
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