Tunable interface hardening: Designing tough bio-inspired composites through 3D printing, testing, and computational validation

Ghimire, Ashish; Tsai, Ya-Yun; Chen, Po-Yu; Chang, Shu‐Wei

doi:10.1016/j.compositesb.2021.108754

Cited by 30 publications

(13 citation statements)

References 51 publications

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“…Among all composites, composite N8W20 has the highest strength (6.2 MPa) and toughness (562.8 KJ/m 3 ), which are 191.3% and 811.0% higher than that of composite N8W00. Interestingly, the increase in toughness of our nacre-like composite is obviously higher than that of other reported nacre-like composites [15][16][17][18][19]21]. Although the strength of composite N8W30 is slightly lower than that of composite N8W20, there is a sharp drop in the toughness of composite N8W30 compared with composite N8W20 due to smaller failure strain.…”

Section: Influence Of Tablet Waviness On Mechanical Behaviorcontrasting

confidence: 58%

Section: Fracture Mechanisms and Morphologiesmentioning

confidence: 52%

“…As discussed in Section 3.1.1, increasing the tablet waviness can improve the resistance of the composites to crack initiation and propagation. It can be seen from Figure 4a that the strain corresponding to the strength σI increases with the increase in tablet waviness, so the deformations spread to a larger area and cause tablet pullout in a larger region, as previous studies reported [15], leading to an increase in the fracture region of composite N8W00, N8W03 and N8W10. Figure 8 W20 and other composites with the same tablet waviness, the overall failure mechanism changes: soft phase failure and tablet break act synergistically leading to the special fracture morphology, that is, the tablets are completely broken, while the fracture ness is not zero.…”

Section: Fracture Mechanisms and Morphologiesmentioning

confidence: 53%

“…Many researchers have studied the effects of structure details on the mechanical performance of the composites inspired by nacre. Ghimire A et al have designed nacre-like composites with interlocked tablets and analyzed the effects of waviness on mechanical properties of nacreous composites; results showed that increasing the tablet waviness can improve the stiffness, strength and toughness of the nacre-like composites [15][16][17][18]. Mirzaeifar et al demonstrated that the existence of a hierarchical architecture in the designing of brick-and-mortar-like structures leads to superior defect-tolerant and structural properties [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Bio-Inspired Structure Based on Nacre and Woodpecker Beak for Enhanced Mechanical Performance

et al. 2021

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Materials with high strength and toughness have always been pursued by academic and industrial communities. This work presented a novel hybrid brick-and-mortar-like structure by introducing the wavy structure of the woodpecker beak for enhanced mechanical performance. The effects of tablet waviness and tablet wave number on the mechanical performance of the bio-inspired composites were analyzed. Compared with nacre-like composites with a flat tablet, the strength, stiffness and toughness of the novel hybrid nacre-like composite with tablet wave surface increased by up to 191.3%, 46.6% and 811.0%, respectively. The novel failure mode combining soft phase failure and tablet fracture revealed the key to the high toughness of composites. Finite element simulations were conducted to further explore the deformation and stress distribution of the hybrid brick-and-mortar-like structure. It showed that the hybrid brick-and-mortar-like structure can achieve a much better load transfer, which leads to greater tensile deformation in tablet before fracture, thus improving strength and energy absorption. These investigations have implications in the design of composites with high mechanical performance for aerospace, automobile and other manufacturing industries.

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Section: Influence Of Tablet Waviness On Mechanical Behaviorcontrasting

confidence: 58%

Section: Fracture Mechanisms and Morphologiesmentioning

confidence: 52%

Section: Fracture Mechanisms and Morphologiesmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

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Hybrid Bio-Inspired Structure Based on Nacre and Woodpecker Beak for Enhanced Mechanical Performance

et al. 2021

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“…To validate the accuracy of the derived equation, the fish scale model is simulated, using finite element analysis (FEA), to reproduce the interaction between scales. Advances in additive manufacturing have enabled the rapid prototyping of various materials and designs [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. As a result, we have fabricated a 3D-printed fish scale model prototype, using polylactic acid (PLA) and Ninjaflex, to demonstrate the applicability of the geometric model.…”

Section: Introductionmentioning

confidence: 99%

Modeling Bioinspired Fish Scale Designs via a Geometric and Numerical Approach

et al. 2021

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Fish scales serve as a natural dermal armor with remarkable flexibility and puncture resistance. Through studying fish scales, researchers can replicate these properties and tune them by adjusting their design parameters to create biomimetic scales. Overlapping scales, as seen in elasmoid scales, can lead to complex interactions between each scale. These interactions are able to maintain the stiffness of the fish’s structure with improved flexibility. Hence, it is important to understand these interactions in order to design biomimetic fish scales. Modeling the flexibility of fish scales, when subject to shear loading across a substrate, requires accounting for nonlinear relations. Current studies focus on characterizing these kinematic linear and nonlinear regions but fall short in modeling the kinematic phase shift. Here, we propose an approach that will predict when the linear-to-nonlinear transition will occur, allowing for more control of the overall behavior of the fish scale structure. Using a geometric analysis of the interacting scales, we can model the flexibility at the transition point where the scales start to engage in a nonlinear manner. The validity of these geometric predictions is investigated through finite element analysis. This investigation will allow for efficient optimization of scale-like designs and can be applied to various applications.

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Modeling of 3D Brick‐and‐Mortar Structures Using Cohesive Zone Finite Elements

Hunter,

Djumas,

Brassart

et al. 2024

Adv Eng Mater

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Nacre‐inspired Brick‐and‐Mortar composite structures exhibit exceptional combinations of properties as well as a highly tunable mechanical response, owing to their large range of design parameters. Understanding the effect of these parameters on the response is essential to optimally design these structures, and this can most efficiently be achieved through modelling. While many computational approaches have been proposed to investigate the relationships between the 2D (planar) geometric design parameters and the response of the structure, there have been limited attempts at modelling 3D (non‐planar) geometric designs. This is mainly due to the high computational cost associated with their complex shapes, including the soft, thin interfacial layer. In this work, we propose to model 3D Brick‐and‐Mortar structures using a finite element framework in conjunction with an experimentally calibrated Cohesive Zone Model to model the layers. The model is successfully validated against experimental results for a non‐planar brick assembly using so‐called osteomorphic bricks. The capabilities of the model are further demonstrated through a parametric study, where the effect of brick shape, number of bricks, and soft layer material properties on the structure mechanical properties (elastic modulus, yield strength and toughness) are investigated. In particular, our numerical results show that toughness is significantly increased by transitioning from a “two‐peak” failure mechanism to a “peak‐plateau‐peak”, which is mainly controlled by the brick shape (angle and aspect ratio). We also show that 3D structures may exhibit significant out‐of‐plane deformation involving the cooperative motion of many bricks, which may contribute to their improved toughness compared to 2D structures.This article is protected by copyright. All rights reserved.

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Tunable interface hardening: Designing tough bio-inspired composites through 3D printing, testing, and computational validation

Cited by 30 publications

References 51 publications

Hybrid Bio-Inspired Structure Based on Nacre and Woodpecker Beak for Enhanced Mechanical Performance

Hybrid Bio-Inspired Structure Based on Nacre and Woodpecker Beak for Enhanced Mechanical Performance

Modeling Bioinspired Fish Scale Designs via a Geometric and Numerical Approach

Modeling of 3D Brick‐and‐Mortar Structures Using Cohesive Zone Finite Elements

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