Herringbone-Bouligand CFRP structures: a new tailorable damage-tolerant solution for damage containment and reduced delaminations Lorenzo Mencattelli a , Silvestre T. Pinho a a Department of Aeronautics, Imperial College London South Kensington, SW7 2AZ, UK Abstract In this work, we design, prototype, test and analyse the first high-performance Herringbone- Bouligand microstructure (with Carbon Fibre Reinforced Plastic (CFRP)) inspired to the high-impact-resistant mantis shrimp’s dactyl club. To this end, we devised the first prototyping procedure to manufacture point-by-point tailorable Herringbone-Bouligand CFRP microstructures; this was based on the micro-moulding of uncured CFRP prepreg, and led to mimicking features of the club microstructure never achieved before with CFRPs. We investigated the damage tolerance of the prototyped Herringbone-Bouligand CFRP laminates, compared against ‘classical’ Bouligand CFRP laminates, using quasi- static indentation tests. Our test results show that the Herringbone-Bouligand mi- crostructure resulted in delayed onset of delaminations, reduced in-plane spreading of damage, increased energy dissipation capability, and in the containment of dam- age within the tailored Herringbone-Bouligand region. We conclude that Herringbone- Bouligand CFRP microstructures offer an excellent tailorable damage-tolerant solu- tion with great potential for composite applications where resistance to through-the- thickness loads is paramount. Keywords: A. Carbon fibres, A. Bio-inspired, A. Herringbone-Bouligand, C. Damage tolerance, C. Damage mechanics Email addresses: [email protected] (Lorenzo Mencattelli), [email protected] (Silvestre T. Pinho)
Herringbone-Bouligand CFRP structures: a new tailorable damage-tolerant solution for damage containment and reduced delaminations
Jun 24, 2023
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