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This paper presents a detailed investigation on the fatigue response and damage progression in pseudoductile thin-ply angle-ply laminates with two configurations: an intermediate modulus-high modulus fibre combined IM-HM [±277/0]s and a standard modulus SM-SM [±266/0]s laminate. 80% of the “yield” stress was found to be the maximum stress for both laminates, where they can withstand 106 cycles without obvious damage or stiffness reduction. When laminates containing pre-fractured 0° plies were loaded in fatigue, both of the laminates showed a delamination dominated damage mode: the delamination initiated from the pre-fractured 0° plies and propagated at the interface between the 0° and angle plies with increasing number of cycles. An estimated delamination growth rate based on the stiffness reduction and delamination initiated from 0° ply fracture are also discussed. The IM-HM laminate with broken 0° fibres can still withstand fatigue loading at 80% severity without further modulus reduction or damage progression, whilst the SM-SM failed in delamination within a small number of cycles.
|Composites Part A: Applied Science and Manufacturing
|Published - Oct 2021
Bibliographical noteFunding Information:
This work was funded by the EPSRC ACCIS Centre for Doctoral Training in Advanced Composites (grant number EP/G036772/1) and under the UK Engineering and Physical Sciences Research Council (EPSRC) Programme Grant EP/I02946X/1 on High Performance Ductile Composite Technology in collaboration with Imperial College, London. The underlying data to support the conclusions are provided within this paper.