  This paper developed a fatigue-driven residual strength model considering the
effects of low-velocity impact (LVI) damage and stress ratio. New fatigue
failure criteria based on fatigue-driven residual strength concept and fatigue
progressive damage model were developed to simulate fatigue damage growth and
predict fatigue life for plain-weave composite laminates with LVI damage. To
validate the proposed model, LVI tests of plain-weave glass fibre reinforced
polymer 3238A/EW250F laminates were conducted, followed by post-impact constant
amplitude tension-tension, compression-compression fatigue tests and multi-step
fatigue tests. Experimental results indicate that the LVI damage degrades
fatigue strength of plain-weave glass fibre composite laminate drastically. The
load history also plays an important role on the fatigue accumulation damage of
post-impact laminates. The new fatigue progressive damage model achieves a good
agreement with fatigue life of post-impact laminates and is able to capture the
load sequence effect, opening a new avenue to predict fatigue failure of
composite laminates.
