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Size effect and quasi-brittle fracture : the role of FPZ

journal contribution
posted on 06.12.2017, 00:00 by X Hu, Kai DuanKai Duan
Abstract Fracture process zone (FPZ), or the crack-tip damage zone created by crack-bridging and micro-cracking activities, in a specimen of a concrete-like material is comparable to the crack size and uncracked ligament, so fracture is typically quasi-brittle. Increasing or decreasing the specimen size, quasi-brittle fracture transition occurs towards the toughness controlled or strength-controlled fracture, which is known as size effect (SE). In this study it is shown that the “size-dependent” quasi-brittle fracture transition is actually due to the interaction of FPZ with the nearest structure boundary rather than the size variation, and the widely-accepted SE for geometrically-similar specimens of different sizes is only a special case ofquasi-brittle fracture controlled by the FPZ/boundary interaction. Relevant SE relations are critically reviewed and explained by emphasizing the key SE mechanism, FPZ/boundary interaction.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

154

Issue

1-2

Start Page

3

End Page

14

Number of Pages

12

eISSN

1573-2673

ISSN

0376-9429

Location

Netherlands

Publisher

SpringerLink

Language

en-aus

Peer Reviewed

Yes

Open Access

No

Era Eligible

Yes

Journal

International journal of fracture.