PSI - Issue 17

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

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Fig.6. Deformation pattern of sample C-5 combined with the graph of the distribution of the energy parameter of the AE signals.

Fig. 5. Strains along the L1 line between V-shaped notches at different shear stress levels using the example of specimen C-7

In general, the use of the video system gives an advantage over the load cells, as it allows seeing the complete picture of heterogeneous deformations, unlike the latter. In the case of using strain gages, it is necessary to select their sizes and layout depending on the structure of the material. 5. Conclusion The analysis of standard and approved composite materials testing samples methods were conduct. The selection and justification of the optimal research direction, the plan for experimental and theoretical work, taking into account the capabilities and features of the latest experimental equipment, have been made. Formed a plan of experimental studies to determine the basic characteristics of composite materials under tension, compression and shear, as well as promising tests using nontrivial methods of stretching and compressing samples with a hole (ASTMD5766 and ASTM D6484), bending a curved beam (ASTM D6415) and compressing plates after impact (ASTM D7136 and ASTM D7137). Formed a task for the manufacture of non-trivial samples. Carbon-fiber reinforced plastic samples were made on the basis of 3D preforms in the form of strip patterns in accordance with the requirements of ASTM D3039, ASTM D3410 and ASTM D5379. Basic (installation) test methods have been adapted for existing Instron equipment, with the corresponding methods (methods) formulated in the specialized Bluehill 2 software, and the necessary restrictions have been set. Experimental studies of the polymer composites samples mechanical behavior were carried out according to basic standard techniques for determining installation characteristics under tension, compression, and shear. The main mechanical characteristics of the presented composite materials are determined. Based on the test results, calculations of the characteristics recommended by ASTM standards are carried out. Acknowledgement This work was carried out in Perm National Research Polytechnic University using the equipment of the Centre of Collective Usage «Center of experimental mechanics» http://www.ckp-rf.ru/ckp/353547/ with the use of the results obtained in the study supported by The Russian Foundation for Basic Research (project No. 18-01-00763)

References

ASTM D3039 / D3039M-17, Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials, ASTM International, West Conshohocken, PA, 2017 ASTM D3410 / D3410M-16, Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials with Unsupported Gage Section by Shear Loading, ASTM International, West Conshohocken, PA, 2016