Bioinspired twisted composites based on Bouligand structures

Pinto, Fulvio; Iervolino, Onorio; Scarselli, Gianfranco; Ginzburg, Dmitri; Meo, Michele

doi:10.1117/12.2219088

Cited by 13 publications

(10 citation statements)

References 24 publications

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“…The published literature on Bouligand-inspired CFRP structures counts several successful attempts of enhancing the damage tolerance to through-the-thickness loads of 'conventional' CFRP structures [2][3][4][5][6][7][8][9][10][11][12][13]. Some of the most relevant accomplishments gathered from the literature are summarised in Table A.…”

Section: Appendixa Benchmark Of Boulignad-inspired Cfrp Structures Against 'Conventional' Cfrp Structuresmentioning

confidence: 99%

“…Helicoidal lamination sequences such as Bouligand-inspired architectures (Figure 1a) have been widely investigated in the past years, leading to successful attempts to enhance the damage tolerance to through-the-thickness loads of fibre reinforced composite materials, including glass fibre reinforced composites [1] and, more frequently, Carbon Fibre Reinforced Plastics (CFRPs) [2][3][4][5][6][7][8][9][10][11][12][13]. Motivated by the enhanced damage tolerance under dynamic and quasi-static through-the-thickness loads of tailored CFRP Bouligand solutions with respect to traditional CFRP laminates, there have been recent developments in our knowledge of the mechanics of Bouligand CFRPs [2][3][4][5][6][7][8][9][10][11][12][13]; these, together with recent developments in automated tow placement, have greatly increased the relevance of Bouligand and Bouligand-inspired structures in Engineering practice.…”

Section: Introductionmentioning

confidence: 99%

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Herringbone-Bouligand CFRP structures: A new tailorable damage-tolerant solution for damage containment and reduced delaminations

Mencattelli

Pinho

2020

Composites Science and Technology

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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 quasistatic indentation tests. Our test results show that the Herringbone-Bouligand microstructure resulted in delayed onset of delaminations, reduced in-plane spreading of damage, increased energy dissipation capability, and in the containment of damage within the tailored Herringbone-Bouligand region. We conclude that Herringbone-Bouligand CFRP microstructures offer an excellent tailorable damage-tolerant solution with great potential for composite applications where resistance to through-thethickness loads is paramount.

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Section: Appendixa Benchmark Of Boulignad-inspired Cfrp Structures Against 'Conventional' Cfrp Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Herringbone-Bouligand CFRP structures: A new tailorable damage-tolerant solution for damage containment and reduced delaminations

Mencattelli

Pinho

2020

Composites Science and Technology

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“…The Bouligand structure is a specific natural architecture, characterized by stacked fibrous layers rotating at specific pitch angles and are commonly found in beetle carapaces [2], mantis shrimp dactyl clubs [3] and crab shells [5]. The mantis shrimp's dactyl club displays exceptional damage tolerance due to its helicoidally stacked (Bouligand) chitin fibres [6][7][8] retarding crack growth and increasing the effective length a crack has to travel to traverse through the thickness of the composite. The concept has already inspired the structural design and optimization of lightweight materials [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Tensile behaviour of unaged and hygrothermally aged discontinuous Bouligand structured CFRP composites

Nwambu

Robert

Alam

2022

Oxford Open Materials Science

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The aim of this paper is to determine the effects of hygrothermal ageing on the tensile behaviour of asymmetric discontinuous helicoidally stacked (Bouligand structured) carbon fibre reinforced plastic (CFRP) composites. Eight different discontinuous Bouligand stacking sequences were manufactured using both major and minor pitch angles. The major pitch angles used were 90° and 120° while minor pitch angles at 5°, 10°, 15° and 25° were stacked from each of the major pitch angles. The composites were tested in tension as either dry unaged specimens or following hygrothermal ageing in seawater at the constant temperatures of 40◦C and 60◦C for over 2000 hrs. Both tensile modulus and tensile strength are found to be detrimentally affected by hygrothermal ageing, and the extent to which ageing affects these properties is shown to be a function of the inter-ply pitch angle. All discontinuous Bouligand structured composites that were hygrothermally aged at the higher temperature of 60 °C were less stiff and weaker than those aged at 40 °C and those that were unaged. This is a result of increased heat exacerbating the ingress of water and consequently damaging fibre-matrix interfaces and plasticising the matrix. The results showed that the minor pitch angles had clear effects on the strength and stiffness of the composites. Composites with 120° major pitch angles exhibited superior elastic modulus and strength values compared to composites with 90° major pitch angles. The Hashin damage model is shown to be accurate in predicting failure in discontinuous Bouligand structured CFRP composites, as evidenced by comparison to fracture paths observed after mechanical testing.

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“…HLS consists of multiple stacks featuring a helicoidal architecture with distinct helical layers. HLS possesses remarkable resistance to damage [9,33]. Additionally, creating a twisting interface along the direction of the crack front through helicoidal fibrous composites can substantially enhance fracture toughness [34,35].…”

Section: Helicoidal Structures Of the Mandiblesmentioning

confidence: 99%

Investigation of bionic composite laminates inspired by the natural impact-resistant helicoidal structure in the mandibles of trap-jaw ants

et al. 2023

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Many living organisms exhibit exceptional capabilities and have evolved effective strategies to synthesize impact-resistant and damage-tolerant structures. One such example can be observed in the rapid mandible strikes of Odontomachus monticola, a species of trap-jaw ants from the ponerinae subfamily. During trap-jaw strikes, the mandibles can achieve peak speeds of 35.42 m/s, and the maximum acceleration can reach 71,729g within an average duration of 0.18 ms. The extreme acceleration results in instantaneous mandible strike forces that can exceed 330 times the ant’s body weight, withstanding thousands of impacts. A natural impact-resistant fibrous helicoidal structure is found in the mandibles of trap-jaw ants. This microstructure is characterized by periodic modulus oscillations that increase energy absorption and improve stress redistribution, offering added protection against damage from impact loading. A carbon fiber reinforced helicoidal composite is fabricated based on the microstructure of the trap-jaw ant’s mandibles. The results show that the helicoidal composite with a 12° helical-fiber exhibits higher residual strength, making it more capable of withstanding strong collisions. The catastrophic propagation of damage along the thickness direction is prevented by in-plane spreading and redirection of cracks. This research provides useful references for fabricating bionic impact-resistant composites.

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Bioinspired twisted composites based on Bouligand structures

Cited by 13 publications

References 24 publications

Herringbone-Bouligand CFRP structures: A new tailorable damage-tolerant solution for damage containment and reduced delaminations

Herringbone-Bouligand CFRP structures: A new tailorable damage-tolerant solution for damage containment and reduced delaminations

Tensile behaviour of unaged and hygrothermally aged discontinuous Bouligand structured CFRP composites

Investigation of bionic composite laminates inspired by the natural impact-resistant helicoidal structure in the mandibles of trap-jaw ants

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