The strength investigation of the composite material with implanted sensors
Keywords:piezoelectric sensor, composite materials, the composite strength investigation, strength analysis.
The homogeneity of the composite material is crucial property during the manufacture process, empty cavities should be avoided and the rate of the epoxy curing should be smoothened through the whole volume. Thus, viscosity and its variation are the key of technological parameters, which qualitatively describes the process of the composite material formation. It is enough to know the character of the viscosity variation but not an absolute value of it. The variation of the viscosity should be observed within the certain amount of points, in order to examine the formation of cavities and to evaluate the curing rate within the volume. The lines of the piezoelectric or magnetostrictive sensors were suggested to implant into the specimen material for the viscosity measurement of separate points. At the beginning of the technological process of composite material manufacturing, the diagnostic lines are implanted into the material. These lines of sensors remain implanted after the end of the manufacturing process of the composite material. The strength characteristic of the composite material is affected by implanted piezoelectric or magnetostrictive sensor lines.
This article describes the processes of ultimate strength of composite material after the sensor implantation. Every material are investigated separately. The specimens without implant and the specimens with the piezoelectric implant of 1.5 mm and 20 mm width were investigated theoretically and experimentally. During the experiment the specimen was stretched by the ends until they fracture.