Determination of mode I dynamic fracture toughness of IM7-8552 composites by digital image correlation and machine learning

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Cidade, RA (Author) Other; Castro, DSV (Author) Other; Castrodeza, EM (Author) Other; Kuhn, P (Author) Other; Catalanotti, G (Author) Other; Xavier, J (Author) Other; Camanho, PP (Author) FEUP

Journal

Title: Composite Structures

Vol. 210

Pages: 707-714

ISSN: 0263-8223

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 16 Citations

Other information

Authenticus ID: P-00Q-3QG

DOI: 10.1016/j.compstruct.2018.11.089

Abstract (EN): An optical experimental procedure for evaluating the J-Integral from full-field displacement fields under dynamic loading is proposed in this work. The methodology is applied to measure the J-integral in the dynamic compressive loading of fiber-reinforced composites and to calculate the dynamic fracture toughness associated with the propagation of a kink-band. A modified J-Integral that considers inertia effects is calculated over the full-field measurements obtained by digital image correlation, for double edge-notched specimen of IM7-8552 laminates dynamically loaded in a split-Hopkinson pressure bar (SHPB). A sensibility study is conducted to address the influence of the speckle parameters. The results show good agreement with experimental observations obtained by using a different data reduction method, suggesting the existence of a rising R-curve for the studied material under dynamic loading. Furthermore, it was noticed that the inertia effect can be negligible, indicating a state of dynamic equilibrium in which quasi-static approaches may comfortably be used.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8