Microstructural damage on thermoplastic hybrid composite in fatigue: Qualitative correlation with a creep strain rate fatigue criterion
Year: 2026
Type: article
Abstract: This study investigates the fatigue behaviour of hybrid PA66 composites reinforced with short and continuous fibres through fatigue testing and in-situ microtomography. Damage initiates in the PA66GF50 short-fibre composite, propagates as a macro-crack towards the UD reinforcement, and leads to fibre fracture, fibre–matrix debonding, and rapid crack growth. A strong correlation exists between cyclic creep stages, at macroscopic level, and damage: primary stage with negligible damage, secondary stage, which defines the cyclic creep strain-rate criterion, is characterised by the initiation and limited progression of micro-damage, and tertiary stage with macro-crack propagation. Weaknesses lie in the short-fibre composite and fibre–matrix interface, rather than between the two polyamides.
Source: International Journal of Fatigue
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,940
OpenAlex ID: W7128729802