PSI - Issue 17

Andrey V. Babushkin et al. / Procedia Structural Integrity 17 (2019) 658–665 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

662

5

Strength, MPa

52,2

54,1

60,1

64,2 4,71 4,35 47,9

62,3

62,8

125,9

139,0

Critical deformation,% Shear modulus, GPa Engineering strain, MPa

5

5

5

5

5

0,98

1,14

3,07 32,9

3,17 41,7

3,46 38,4

4,14 41,2

4,86 50,1

14,54

14,03

-

-

The study of inhomogeneous deformation fields and temperatures, as well as the acoustic emission response in accordance with the loading process for samples of each type was also conduct. Studies of the damage accumulation patterns and the formation of fracture conditions in sample strips were carried out on the basis of an experimental data set analysis: loading diagrams, non-uniform deformation fields and temperatures, and acoustic emission signals. As a result of a mechanical behaviour comprehensive analysis, patterns of damage accumulation and destruction of composite samples using additional registration in tensile tests means, it was concluded that the multiparametric analysis method is highly effective. The combined use of test and diagnostic equipment can significantly increase the information content of the experimental database, to ensure the accuracy of the results. It is of interest to conduct a qualitative and quantitative comparison of the complex analysis parameters obtained for a group of samples with different weave patterns. The paper proposed a comparison of experimental data using a radar chart (spider diagrams - Fig. 3). This diagram is constructed for one sample from each series of samples. Thus, the red line indicates data for sample A-1-01-2-2, where the letter A denotes interlacing patterns, and the numbers indicate the number of the sample within the series. The maximum load (P max , kN), the ultimate elongation of the sample (U max , mm), the heating of the material at the time of the sample macro destruction (ΔT max , °С), the maximum value of the cumulative energy reached at the time of destruction (CЕ max *10 -5 , В 2 с), as well as the number of registered peaks (maximum) of the AE signals (N sum , units). The values in Fig. 3 are in relative terms.

P max

CЕ max

U max

ΔT max

N sum

Fig. 3. Multiparameter analysis of the effect of the weave pattern of composite strip patterns. Values are in relative terms.

Formed a plan of theoretical studies and design work. Mathematical description and development of methods for modelling the structures of composite materials in the sample-structures working areas in accordance with the plan of experimental studies were made. It was proposed to consider three options for structuring the material. In the first