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Snap-back instability in micro-structured composites and its connection with superplasticity

Carpinteri, Alberto and Paggi, Marco and Zavarise, Giorgio Snap-back instability in micro-structured composites and its connection with superplasticity. Strength, Fracture and Complexity, 3 (2-4). pp. 61-72. ISSN 1567-2069 (2005)

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Instability phenomena occurring in the microstructure of micro-structured composites are numerically investigated. To this aim, an interface constitutive law is proposed to describe both decohesion and contact at bi-material interfaces. These formulations are implemented in the FE code FEAP. Then, by applying dimensional analysis, the nondimensional parameters governing the macroscopic response of the composite are identified. According to this model, transverse debonding with respect to the fiber direction is simulated and the transition from snap-back instability in case of coarse fiber diameters, to a stable mechanical response for finer reinforcements is quantified. These results provide a possible quantitative explanation to the role played by the size of the reinforcement on the instability phenomena experimentally observed during superplastic deformation.

Item Type: Article
Uncontrolled Keywords: Fiber reinforced metal matrix composites, snap-back instability, superplasticity, interface debonding, finite element method
Subjects: T Technology > TJ Mechanical engineering and machinery
Research Area: Computer Science and Applications
Depositing User: Prof Marco Paggi
Date Deposited: 25 Nov 2013 10:15
Last Modified: 09 Oct 2014 09:20
URI: http://eprints.imtlucca.it/id/eprint/1937

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