Mixed mode fracture analysis in a ductile adhesive using semi-circular bend (SCB) specimen

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Ajdani, A (Author) Other; Ayatollahi, MR (Author) Other; da Silva, LFM (Author) FEUP

Journal

Title: Theoretical and Applied Fracture Mechanics

Vol. 112

ISSN: 0167-8442

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00T-KZ9

DOI: 10.1016/j.tafmec.2021.102927

Abstract (EN): An improved semi-circular bend (SCB) specimen is introduced to obtain the mixed mode fracture envelope of a ductile adhesive with a considerable fracture process zone ahead of the crack tip. This specimen has been used for brittle adhesives fracture energy measurement. The proposed test procedure is very simple to implement and does not require any special loading fixture. The specimen is able to cover the whole mixed-mode ratios from pure mode I to pure mode II. Experiments are carried out on the manufactured specimens and the fracture loads are used in an inverse approach to obtain the fracture energy of the adhesive joints. The cohesive zone modelling (CZM) technique is employed as the data reduction method. Proper geometrical parameters for SCB joints are chosen through a wide-range of numerical simulations based on a linear elastic formulation. It is shown that the crack growth does not affect the mixed-mode ratio for the proposed adhesive joint. Another advantage of this specimen compared to the existing beam-based approaches (such as end-notched flexure (ENF), mixed-mode bend (MMB), etc.) is its lower risk of plastic deformation in the adherends. The mixed mode fracture enve-lope in the tested adhesive is obtained and the results of fracture energy under pure mode I loading are validated with the results of double cantilever beam (DCB) tests successfully.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9