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Influence of Fiber Bridging on Mode I Interlaminar Fracture Toughness of Composites
Received date: 2012-05-23
Revised date: 2012-09-21
Online published: 2013-04-23
T700/9916 composite laminate specimens are tested according to ASTM D 5528 standards, and the fiber bridging effect on Model I interlaminar fracture toughness is investigated in double cantilever beam (DCB) tests. From experimental observation, a model with single (s zone) and double fiber bridging zone (d zone) is proposed. The number of bridging fibers on a point of the d zone is twice as large as that on a point of the s zone. From an interaction analysis between the bridging fibers and the beam, an exponentially decreasing function of single fiber bridging force versus angle is built. Based on the analysis above, a DCB model involving the bridging force function of the whole beam is established. The simulation results show a satisfactory agreement with test results. The present fiber bridging model reflects how bridging fibers act in the process of crack propagation.
Key words： composite; fracture toughness; bridging fiber; fiber bridging model; DCB specimen
ZHANG Long , WANG Bo , JIAO Guiqiong , HUANG Tao . Influence of Fiber Bridging on Mode I Interlaminar Fracture Toughness of Composites[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(4) : 817 -825 . DOI: 10.7527/S1000-6893.2013.0141
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