ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Theoretical Methodology for Laminated Composite Strength Including In-situ Effect
Received date: 2013-12-09
Revised date: 2014-05-13
Online published: 2014-06-06
Supported by
Aeronautical Science Foundation of China (20120953010)
In order to accurately predict the failure initiation and propagation for composite laminates, a strength theory including in-situ effect is developed. The method deals with the determination of in-situ strength, damage initiation and material properties degradation. The theory of the in-situ strength, based upon the principle of fracture mechanics and certain assumptions, divides the laminate into embedded thick ply, embedded thin ply and outer surface ply and provides them with different calculation methods. An intralaminar failure initiation criterion including in-situ strength is proposed and the corresponding failure analysis procedure is developed. The predictions of failure envelopes for unidirectional and multidirectional laminates are conducted. The results show that the developed method predicts the structural failure initiation and captures the experimental phenomena from the initiation to the final failure pretty well. The prediction accuracy is significantly improved compared to the wide applied Hashin criterion. The strength analysis result for a quasi-isotropic laminate shows that the failure onset envelope agrees well with the experiment when in-situ strength is used, which necessitates the consideration of in-situ effect in composites structural strength analysis.
LI Biao , LI Yazhi , Yang Fan . Theoretical Methodology for Laminated Composite Strength Including In-situ Effect[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(11) : 3025 -3036 . DOI: 10.7527/S1000-6893.2014.0101
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