Failures of multilayered polymers can be categorized into two modes: macroscale failure and microscale failure. Macroscale failure refers to excessive overall creep deformation. Microscale failure refers to microscopic free edge delamination and /or crack propagation due to local concentrated stresses. In the present study, a macroscale model for creep deformation is developed and experimentally verified. For linear viscoelastic materials the model is derived from classical laminate plate theory and is capable of characterizing polymers with directional properties. Creep test results for laminated Nylon66/orthotropic liquid crystalline polymer (linear) specimens agreed well with the analytical model predictions. A case study in which the macroscale failure model is applied to design of multilayered tubes is also presented.
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