Stress state analysis and optimization in the vicinity of the sensor of SMART-material

Composite materials in practical human activity are well positioned, and their range of applications is constantly expanding. Composite materials based on polymer are widely used among the different kinds of composite materials. The nomenclature of these materials is very wide and their properties are different from each other. For these reasons, the complex structure of the material and number of other factors, the traditional methods of assessing the strength and reliability of construstions from polymeric composite materials (PCM) should be complemented. In particular, by using new and effective monitoring systems. One of these modern methods of diagnostics is creation SMART-materials with embedded sensors. As a sensors the piezoelectric sensors or optical fibers are used. They can be located on the surface of the material or embedded in the polymer composite material. New methods of diagnostics products from these materials increase their competitiveness. Based on numerical modelling and experimental researches, the aim of the work is to search different ways of solving the problem, that allow to increase SMART-material reliability as well as proper registration of the strain field, using the fiber-optic sensors and piezoelectric elements. The problems of the adhesive joint geometry optimization that appear while mounting sensitive elements on the PCM surface and designing optical fiber outputs were considered in this paper. The results of adhesive joint influence on sensors indications were shown. Besides, the stress-strain state analysis that includes the singular solutions for the points, where infinite stress may occur, was carried out in the framework of this study.