A Modified Mean Stress Criterion for Considering Size Effects on Mode I Fracture Estimation of Rounded-Tip V-Notched Polymeric Specimens

Autor: Ali Reza Torabi, Mahdi Jabbari, Javad Akbardoost, Sergio Cicero
Přispěvatelé: Universidad de Cantabria
Rok vydání: 2022
Předmět:
Zdroj: Polymers, 2022, 14, 1491
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
Polymers; Volume 14; Issue 7; Pages: 1491
ISSN: 2073-4360
Popis: The aim of this paper is to assess the size and geometry effects on the mode I notch fracture toughness of polymeric samples containing rounded-tip V-shaped (RV) notches (V-notch with a finite radius at the notch tip). First, using a large number of fracture tests on an RV-notched Brazilian disk and semi-circular bending polymeric samples with four different sizes, the size-dependent values of the notch fracture toughness are obtained. Then, the mean stress criterion is modified for characterizing the size-dependency of notch fracture toughness in polymeric samples. The resulting modified mean stress criterion considers higher order terms of the stress field when calculating the fracture process zone length around the tip of the defect. Additionally, the critical distance rc is assumed to be associated with the specimen size and a formula containing fitting parameters is utilized for considering this trend of rc. The comparison between the values of notch fracture toughness obtained from experiments and those predicted by the modified mean stress criterion shows that the suggested approach can provide accurate estimations of size-dependent values of notch fracture toughness in polymeric specimens containing RV notches.
Databáze: OpenAIRE
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