TRANSACTIONS OF THE KRYLOV STATE RESEARCH CENTRE

Science journal

 
ISSN (print) 2542-2324 /(online) 2618-8244


Articles of The Transactions of KSRC








Application of J-integral to failure viscosity assessment of polymeric composites



Full text article ( in russian)

Year

 
2021

Issue

 
20212

Volume

 
2

Pages

 
108-113

Caption

 
Application of J-integral to failure viscosity assessment of polymeric composites

Authors

 
Banchuk A., Yeranosyan K.

Keywords

 
fracturing viscosity, fracture toughness, layered composites, J-integral, numerical experiment

DOI

 
10.24937/2542-2324-2021-2-S-I-108-113

Summary

 
This paper discusses a relevant topic of improving the approaches to fracture toughness determination of layered compo sites. Current ASTM regulations imply the calculation of critical value for fracturing viscosity as per the test data following the classic approach of linear-elastic fracture mechanics (LEFM). For some materials, however, LEFM-based estimates are not realistic. As an alternative to LEFM in calculation of critical failure viscosity value, this paper suggests a method of J-integral. The data needed to apply this method were obtained through numerical experiments in ANSYS finite-element software package. The results of numerical experiments were used to construct load-displacement curves and compare them with the test data. The difference between critical viscosity fracturing values yielded as per LEFM and J-integral method might be as high as 33 %. This study revealed that J-integral method offers more accurate fracture toughness estimates for layered composites because maximum design load results based on critical fracturing viscosity value obtained using J-integral deviated from average loads recorded during physical tests by not more than 2% whereas LEMF-based in certain cases had this deviation as high as 15 %. Still, J-integral method applied in this study required the inputs from numerical analysis, so it needs additional experimental verification.

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