AN ANALYSIS PROCEDURE FOR QUANTIFYINGTHE FRAGMENTATION BEHAVIOR OF 2-DMULTI-FIBER ARRAYS

摘要

With composite materials being targeted for use in structural applications, concerns havernincreased about their long-term structural integrity, since conventional sub-critical flaw detectionrnmethodologies are generally not effective for composites. Furthermore, concerns aboutrncomposite failure models that are typically used to predict failure behavior of composites in lieurnof testing have also increased due to the 1995 research of Li et al. and the 2004 research of Kimrnet al. These research results employing micromechanics tests on multi-fiber microcompositesrnindicate that the underlying shear-lag models typically used to predict composite failurernbehavior show an increase in fiber-flaw density along the length of a composite fiber rather thanrnthe experimentally observed decrease. More recently Kim et al. have shown that the multiplernfiber fracture process observed in a single fiber composite can be captured by statistical modelsrnbased on lifetime analyses. The output parameters from these analyses may provide a basis forrnquantifying the fiber failure process in different composite materials. To test the validity of thisrnmethod, the lifetime analyses approach is extended in this report to the fiber-fracture process inrnmulti-fiber microcomposites.