The yield behaviour of an array of metal-coated fibres

摘要

The biaxial compaction of a square array of metal--coated fibres(MCFs) is examined using the finite element method. The array isfirst compacted to a certain density using biaxial loading pathsconsistent with those for hydrostatic and closed--die compaction. Theyield surfaces are then constructed at various stages of thedensification. The size and shape of the yield surface depend on theloading history, relative density and on the fibre volume fraction.The yield surface after hydrostatic compaction has a corner at theinitial loading point However, the location of the corner on theyield surface after closed--die compaction depends on the relativedensity and the fibre volume fraction. The numerical results of thehydrostatic yield surface over a range of loading path are in goodagreement with Fleck ()995) micro--mechanical model originallydeveloped for the compaction of a random array of homogeneousparticles.