Residual static strength and the fracture initiation path in adhesively bonded joints weakened with interfacial edge pre-crack

• Type: Article in International Scientific Journal
• Date: 2018

Authors

A. Akhavan-Safar (Author) Other; M. R. Ayatollahi (Author) Other; S. Rastegar (Author) Other; Lucas F. M. da Silva (Author) FEUP

Journal

Title: Journal of Adhesion Science and Technology

Vol. 32 No. 18

Pages: 2019-2040

ISSN: 0169-4243

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 2 Citations

INSPEC

Other information

Authenticus ID: P-00N-Y16

DOI: 10.1080/01694243.2018.1458812

Abstract (EN): This paper deals with the application of fracture mechanics approaches for predicting the residual static strength and the crack kinking angle of adhesively bonded joints containing interfacial edge pre-cracks. The interfacial cracks are created due to different factors such as inappropriate surface preparation which cause a significant reduction of the joint strength. To investigate the residual strength of interfacial cracked adhesive joints and predict the crack kinking angle, three different approaches including the maximum tangential stress (MTS), the minimum strain energy density (SED) and the maximum tangential strain energy density (MTSED) were assessed. To this end, single lap joints (SLJs) containing a brittle adhesive material and with different pre-crack sizes and various substrate thicknesses were manufactured and tested. The results were also verified by applying fracture mechanics approaches on previously published experimental data. According to the results, it was concluded that in mode II dominant cases, the predictions of kinking angle using the MTS method was in good agreement with the experimental observations, while in mode I dominant cases the mentioned approach provided poor predictions. It was also found that the SED criterion could be a precise model for predicting the crack extension angle in mode I dominant conditions. The results also showed that the MTS criterion predicts the residual static strength of interfacial cracked adhesive joints very well.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 22