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DANNEGGIAMENTO E MECCANICA DELLA FRATTURA ALL'INTERFACCIA FIBRA-MATRICE IN MATERIALI COMPOSITI
Last modified: 2008-06-13
Abstract
In this study the finite element method is used to investigate the axial fiber stress profiles and energy
changes accompanying interfacial debonding and/or matrix cracking following a single fiber
fragmentation event. A damage parameter D was evaluated in order to quantify the decrease of the
load-carrying capacity of the fiber due to debonding and/or matrix cracking.
Since the stress transfer along the fiber length changes over a long distance from the broken fiber end, a
study was made of the effect of model size on calculated values of the stress profiles and energy changes.
The radial dimension must extend to at least 10 fiber diameters and the half-fragment length must also be
greater than approximately 20 fiber diameters, before a size independent calculated value of the strain
energy release rate, G, can be attained.
changes accompanying interfacial debonding and/or matrix cracking following a single fiber
fragmentation event. A damage parameter D was evaluated in order to quantify the decrease of the
load-carrying capacity of the fiber due to debonding and/or matrix cracking.
Since the stress transfer along the fiber length changes over a long distance from the broken fiber end, a
study was made of the effect of model size on calculated values of the stress profiles and energy changes.
The radial dimension must extend to at least 10 fiber diameters and the half-fragment length must also be
greater than approximately 20 fiber diameters, before a size independent calculated value of the strain
energy release rate, G, can be attained.
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