PSI - Issue 17

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

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Procedia Structural Integrity 17 (2019) 651–657

ICSI 2019 The 3rd International Conference on Structural Integrity The fatigue durability GFRP under increased temperatures Lobanov Dmitrii S. a , Staroverov Oleg A. b Center of Experimental Mechanics, Perm National Research Polytechnic University, Perm, Russia, a cem.lobanov@gmail.com., b cem_staroverov@mail.ru ICSI 2019 The 3rd International Conference on Structural Integrity The fatigue durability GFRP under increased temperatures Lobanov Dmitrii S. a , Staroverov Oleg A. b Center of Experimental Mechanics, Per National R search Polytechnic University, Perm, Russia, a cem.lobanov@gmail.com., b cem_staroverov@mail.ru

Abstract Abstract

The actual tasks of the mechanics of composite materials are studies of the laws of deformation, fracture and mechanical behavior of composites under the influence of high and low (working) temperatures, climatic factors and working dirty environments. No less urgent task is to study issues related to the analysis of the conditions of failure, the accumulation of damage and the survivability of composites during cyclic loads. In connection with the above tasks, the paper presents the results of experimental studies of the effect of high temperatures on the fatigue life of aviation structural fiberglass plastics. Studies were conducted at the Center for Collective Use of the Center of Experimental Mechanics PNRPU. The objects of the study were samples of structural fiberglass for aerospace purposes, which were manufactured by serial technology of autoclave molding from glass fiber prepreg. In the course of study, static mechanical characteristics were determined (refined), temperature dependencies of static tensile strength and elastic modulus were obtained, temperature dependences of fatigue life were obtained, and conditions for changing the fracture mechanisms of fiberglass samples were analyzed. The actual tasks of the mechanics of composite materials are studies of th laws of deformatio , fracture and mechanical behavior of composites under the infl ence of high and low (w rking) temperatures, climatic factors and w rking dirty environments. No less urgent task is to study issues related to the analysis of the conditions of failure, the accumulation of damage and the s rvivability of composites during cyclic loads. In connection with the above tasks, the p per presents the r sults of experimental studi s of the effect of high temperatures on the fatigu life of aviation structural fiberglass plastics. Studies were conducted at the Center for Collective Use of the Center of Experimental Mechanics PNRPU. The objects of the study were samples of structural fiberglass for aerospac purposes, which w re manufactured by serial technology of autoclave molding from glass fiber prepreg. In the course of study, static mechanical characteristics were determined (refined), temperature depende cies of static tensile strength and elastic modulus were obtained, temper ture dependences of fatigue life were obtained, and conditions for changing the fracture mechanisms of fiberglass samples were 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: composite materials, quasistatic and cyclic loads, temperature degradation, residual strength, damage accumulation Keywords: composite materials, quasistatic and cyclic loads, temperature degradation, residual strength, damage accumulation

1. Introduction 1. Introduction

The use of advanced composites in critical structures is widespread in the aviation, aerospace and engineering industries. As there is a constantly increasing demand for reliability and safety of structures made of composite materials, it becomes necessary to obtain experimental data on damage accumulation and failure of composite structures in conditions close to operational ones by Lobanov D.S., Slovikov S.V. (2017), Kucher N.K. et al (2013), Lobanov D.S. et al (2018), (2015). It is relevant to carry out researches in experimental mechanics of composites and analyze the effect of high and low (operational) temperatures on mechanical properties and fracture mechanisms of composite materials and setting temperature relations of elastic and strength characteristics of composites used in The use of advanced composites in critical structures is widespread in the aviation, aerospace and engineering industries. As there is a constantly increasing de and for reliability and safety of structures made of co posite materials, it becomes necessary to obtain experimental data on damage accumulation and failure of composite structures in conditions close to operational ones by Lobanov D.S., Slovikov S.V. (2017), Kucher N.K. et al (2013), Lobanov D.S. et al (2018), (2015). It is relevant to carry out researches in experimental mechanics of composites and analyze the effect of high and low (operational) temperatures on mechanical properties and fracture mechanisms of composite materials and setting temperature relations of elastic and strength characteristics of composites used in

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.2019.08.087