Strength Tests of Carbon Plastic Samples Using Dynamic Tensometry

Abstract

Comparative analysis of results of determining the stress-strain state (SSS) of a specimen with the laying of [± 45/90/03/90/± 45] Torayca T700 prepreg with geometric dimensions of 500 × 100 × 1.7 mm during its tension was performed. Stress concentrator was a hole with a diameter of 14 mm located in the center. The loading was carried out on a MTS Landmark test machine. The load increased stepwise through the interval ΔР = 10 kN until complete destruction of the sample, which occurred at P = 97 kN. The stress value was determined by calculation method and experimentally. The Compass 3D system was used, in which the VAT of the sample was simulated at each loading stage. Stress distribution in the model with increasing load is shown, which reflects the process of sample destruction during testing. Experimental values of relative deformations and corresponding stresses were determined using the dynamics-3 multichannel microprocessor-based fast-acting tensometric system. Strain gages were glued to the sample, two of which were located near the edge of the hole, the other two at a distance of 44 mm and 40 mm. It was established that the pre-destructive state corresponded to the redistribution of relative deformations with their subsequent double increase. The loads at which destruction of the sample material appears in the area of installation of strain gauges were determined