How pure mode I can be obtained in bi-material bonded DCB joints: A longitudinal strain-based criterion
In: Composites Part B: Engineering, Jg. 153 (2018-11-01), S. 137-148
Online
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Zugriff:
An essential question to predict the structural integrity of bi-material bonded joints is how to obtain their fracture properties under pure mode I. From open literature, it is found that the most commonly used design criterion to test mode I fracture is matching the flexural stiffnesses of the two adherents in a DCB coupon. However, the material asymmetry in such designed joints results in mode II fracture as well. In this paper, a new design criterion is proposed to obtain pure mode I fracture in adhesively bonded bi-material DCB joints by matching the longitudinal strain distributions of the two adherends at the bondline - longitudinal strain based criterion. A test program and Finite Element modelling have been carried out to verify the proposed design criterion using composite-metal bonded DCB joints. Both the experimental and numerical results show that pure mode I can be achieved in bi-material joints designed with the proposed criterion. G II / G I ratio is reduced by a factor of 5 when using the proposed longitudinal strain based criterion in comparison with the flexural stiffness based criterion.
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How pure mode I can be obtained in bi-material bonded DCB joints: A longitudinal strain-based criterion
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Autor/in / Beteiligte Person: | Romina Lopes Fernandes ; Sofia Teixeira de Freitas ; Benedictus, Rinze ; Zarouchas, Dimitrios ; Wang, Wandong |
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Zeitschrift: | Composites Part B: Engineering, Jg. 153 (2018-11-01), S. 137-148 |
Veröffentlichung: | Elsevier BV, 2018 |
Medientyp: | unknown |
ISSN: | 1359-8368 (print) |
DOI: | 10.1016/j.compositesb.2018.07.033 |
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