Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science

EXPERIMENTAL STUDIES AND MODELLING OF FRACTURE TOUGHNESS OF THE EPOXY SAMPLES WITH ECCENTRIC CRACKS


DOI: 10.5937/jaes0-28162 
This is an open access article distributed under the CC BY 4.0
Creative Commons License

Volume 18 article 751 pages: 719 - 723

Vladimir A. Korolenko*
Moscow Aviation Institute (National Research University), Institute of General Engineering Education, Moscow, Russian Federation

Yulong Li
Northwestern Polytechnical University (NPU), School of Civil Aviation, Xi'an Shaanxi, People's Republic of China

Vasiliy N. Dobryanskiy
Moscow Aviation Institute (National Research University), Institute of General Engineering Education, Moscow, Russian Federation

Yury O. Solyaev
Moscow Aviation Institute (National Research University), Institute of General Engineering Education, Moscow, Russian Federation
Russian Academy of Sciences, Institute of Applied Mechanics, Moscow, Russian Federation

The relevance of the work is due to the need for experimental studies to determine the mechanical characteristics of epoxy resin samples, which can be used to check the correctness of the choice of parameters and criteria for the onset of crack growth within the framework of elastic fracture mechanics, cohesive models, models such as virtual crack closure technique, extended finite element method, etc. Thus, the article is aimed at determining the parameters of fracture toughness of samples of brittle epoxy resin with applied eccentric cracks. The leading method for the study of this problem is the experimental method, which makes it possible to determine the critical stress intensity factor for three-point bending of samples with an edge crack, as well as to study samples with an eccentric (relative to the center of the sample) location of cracks. The paper presents the results of experimental studies to determine the critical stress intensity factors for samples of brittle epoxy resin L285 with hardener H 285 (Hexion), obtained without the addition of a plasticizer. The results of testing samples with asymmetric cracks are compared with the results of numerical modeling within the framework of elastic fracture mechanics with the energy fracture criterion. The materials of the article are of practical value, first of all, for the calibration of fracture mechanics models.

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This work was supported by the RFBR grant 18-31- 20043.

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