Abstract
The fatigue behaviour of a unidirectional boron reinforced aluminium composite under transverse loading was modelled by a technique involving the iteration of damage accumulation and internal stress redistribution. Damage accumulation in the aluminium matrix can be described by applying the fatigue damage evolution law modified to account for strain level. The redistribution of stresses during fatigue can be calculated using a finite element stiffness matrix incorporating the damage variable. A two-scale element approach involving a microelement in a macroelement was used to relate the global and local behaviour of the material. Using this approach, the fatigue lives of two composites based on 6061 aluminium alloy reinforced with 0.25 and 0.5 volume fractions of boron respectively were predicted using the properties of the matrix and fibre materials.
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