PSI - Issue 17

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 17 (2019) 865–871

ICSI 2019 The 3rd International Conference on Structural Integrity Study of The Regularities of Postcritical Behavior and Failure of Specimens in the Tests of Composite Materials ICSI 2019 The 3rd International Conference on Structural Integrity Study of The Regularities of Postcritical Behavior and Failure of Specimens in the Tests of Composite Materials

Tretyakov M.P.*, Lobanov D.S., Wildemann V.E. Perm National Research Polytechnic University, Center of Experimental Mechanics 614990, 29, Komsomolskiy Ave., Perm, Russia Tretyakov M.P.*, Lobanov D.S., Wildemann V.E. Perm National Research Polytechnic University, Center of Experimental Mechanics 614990, 29, Komsomolskiy Ave., Perm, Russia

Abstract Abstract

New experimental data on the regularities of deformation and fracture of layered GFRP and CFRP composites with various reinforcement schemes were obtained. Particular attention is paid to the manifestation of the postcritical behavior of composites, which is characterized by a decrease in the load that the sample is able to perceive, with a monotonous increase in displacements. In this case, the postcritical deformation stage is associated with the development of damage accumulated during the loading process, interaction of defects and subsequent partial destruction of the structural elements of the composite material. The tests were carried out on the samples of various shapes under three-point bending in a wide range of temperatures. The influence of temperature on the regularities of deformation and fracture of polymer composites and the realization degree of the postcritical deformation stage has been estimated. Methodical issues of experimental study of the effect of the rigidity of the loading system on the postcritical deformation and destruction of polymer composites under three-point bending and interlayer shear (short beam method) are considered when using various combinations of disc springs in the loading circuit. Experimental data on the effect of the rigidity of the loading system on the realization of the equilibrium stage of postcritical deformation during the destruction of composite materials during the interlayer shear are obtained. The structure of the destroyed prototypes was analyzed. New experimental data on the regularities of deformation and fracture of layered GFRP and CFRP composites with various reinforcement schemes were obtained. Particular attention is paid to the manifestation of the postcritical behavior of composites, which is characterized by a decrease in the load that the sample is able to perceive, with a onotonous increase in displacements. In this case, the postcritical deformation stage is associated with the development of damage accu ulated during the loading process, interaction of defects and subsequent partial destruction of the structural elements of the composite material. The tests were carried out on the samples of various shapes under three-point bending in a wide range of temperatures. The influence of temperature on the regularities of deformation and fracture of polymer composites and the realization degree of the postcritical deformation stage has been estimated. Methodical issues of experimental study of the effect of the rigidity of the loading syste on the postcritical deformation and destruction of polymer composites under three-point bending and interlayer shear (short beam method) are considered when using various combinations of disc springs in the loading circuit. Experimental data on the effect of the rigidity of the loading system on the realization of the equilibrium stage of postcritical deformation during the destruction of composite materials during the interlayer shear are obtained. The structure of the destroyed prototypes was analyzed.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Compposite material, postcritical deformation, interlayer shear (short beam method), rigidity of the loading system, temperature tests Keywords: Compposite material, postcritical deformation, interlayer shear (short beam method), rigidity of the loading system, temperature tests

* Corresponding author. Tel.: +7-342-239-1111; fax: +7-342-239-1224. E-mail address: cem_tretyakov@mail.ru * Corresponding author. Tel.: +7-342-239-1111; fax: +7-342-239-1224. E-mail address: cem_tretyakov@mail.ru

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.115