Abstract
To determine the mechanical characteristics under conditions of intense dynamic impacts of polymer composite materials during interlayer shear, three experimental schemes were proposed and tested: dynamic three-point bending of a short beam, dynamic compression of specimens-plates with notches, and dynamic extrusion of the middle part of specimens in the form of parallelepipeds. To create shock loads and record the response of the samples, the technique of measuring rods is used. The calculation of forces and displacements is carried out according to the Kolsky formulas according to the data of tensometric measurements. Using numerical simulation, one of the fundamental assumptions and conditions for the applicability of the Kolsky method for determining the characteristics of materials in an experiment on dynamic bending of a short beam, namely, the condition of dynamic equilibrium of the sample during loading, was verified. Approbation of the schemes was carried out on samples of a layered composite material with a polymer matrix reinforced with carbon fiber. A comparative analysis of the data obtained using three different test schemes is given. It is noted that the data obtained by the extrusion method are in good agreement with the data determined during dynamic compression of notched specimens. The strength characteristic, determined by the short beam bending method, turned out to be noticeably higher. It has been found that the interlaminar shear strength values determined in the dynamic range are, on average, 25% lower than the static characteristic. Of the three schemes, the most preferable is the scheme for extrusion of the middle part of the parallelepiped specimen, since, unlike beam bending, it allows you to vary and control the loading conditions, and, unlike testing notched specimens, it is symmetrical, which eliminates the appearance of bending moments in the specimen.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
