Spatial programming of defect distributions to enhance material failure characteristics

Mo, Chengyang; Raney, Jordan R.

doi:10.1016/j.eml.2019.100598

Cited by 14 publications

(11 citation statements)

References 29 publications

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“…As a result, it is highly possible that cracks propagate in the matrix between the fiber sheets rather than cut through the fibers, leading to a twisted crack surface and significantly increasing the crack surface per unit volume to improve the energy dissipation. In addition to the twisting crack, crack bridging is another competing fracture mechanism in the Bouligand structure. − The coexistence of these two fracture mechanisms found in the endocuticle (Figure b) indicates a possible transition between them, further facilitating the energy dissipation.…”

Section: Resultsmentioning

confidence: 99%

Optimized Hierarchical Structure and Chemical Gradients Promote the Biomechanical Functions of the Spike of Mantis Shrimps

Liu

Lin

et al. 2021

ACS Appl. Mater. Interfaces

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The tail spike of the mantis shrimp is the appendage for counteracting the enemy from behind. Here, we investigate the correlations between the chemical compositions, the microstructures, and the mechanical properties of the spike. We find that the spike is a hollow beam with a varying cross section along the length. The cross section comprises four different layers with distinct features of microstructures and chemical compositions. The local mechanical properties of these layers correlate well with the microstructures and chemical compositions, a combination of which effectively restricts the crack propagation while maximizing the release of strain energy during deformation. Finite element analysis and mechanics modeling demonstrate that the optimized structure of the spike confines the mechanical damage in the region near the tip and prevents catastrophic breakage at the base. Furthermore, we use a 3D printing technique to fabricate multiple hollow cylindrical samples consisting of biomimetic microstructures of the spike and confirm that the combination of the Bouligand structure with radially oriented parallel sheets greatly improves the toughness and strength during compression tests. The multiscale design strategy of the spike revealed here is expected to be of great interest for the development of novel bioinspired materials.

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Section: Resultsmentioning

confidence: 99%

Optimized Hierarchical Structure and Chemical Gradients Promote the Biomechanical Functions of the Spike of Mantis Shrimps

Liu

Lin

et al. 2021

ACS Appl. Mater. Interfaces

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“…27 In addition to this large elastic contrast, interfilament defects can also encourage crack deflection. 28 For example, the solvents required to print the PDUO-GF ink result in the formation of small bubbles as they evaporate. The solvents evaporate during printing, as illustrated in Fig.…”

Section: Resultsmentioning

confidence: 99%

Direct ink writing of tough, stretchable silicone composites

Yin

Raney

2022

Soft Matter

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“…[ 15,18,56 ] Previous work on bioinspired Bouligand materials at the macroscale similarly utilized stiff fibers and soft matrix materials comprising at least two full Bouligand stacks [ 57 ] and successfully reproduced crack twisting, demonstrating reduced damage propagation and enhanced damage tolerance. [ 26–29 ]…”

Section: Discussionmentioning

confidence: 99%

“…[ 20–25 ] Work on the fracture and impact behavior of bioinspired Bouligand materials has successfully replicated toughening mechanisms like crack twisting and blunting, demonstrating the high fracture resistance of this architecture, and providing a mechanistic understanding of the key design features contributing to this enhanced damage tolerance. [ 26–29 ] Many of these studies have utilized complex multi‐material fabrication and characterization techniques, but the large size of the constituent features in most architected materials precludes the utilization of size‐affected material properties that are theorized to exist in natural structural materials. Recent work on nanoscale architected materials has demonstrated that size‐enhanced properties can be utilized toward the creation of incredibly strong, lightweight, and flaw‐tolerant materials.…”

Section: Introductionmentioning

confidence: 99%

“…[20][21][22][23][24][25] Work on the fracture and impact behavior of bioinspired Bouligand materials has successfully replicated toughening mechanisms like crack twisting and blunting, demonstrating the high fracture resistance of this architecture, and providing a mechanistic understanding of the key design features contributing to this enhanced damage tolerance. [26][27][28][29] Many of these studies have utilized complex multimaterial fabrication and characterization techniques, but the…”

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confidence: 99%

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Toughness Amplification via Controlled Nanostructure in Lightweight Nano‐Bouligand Materials

Patel

Meza

2023

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The enhanced properties of nanomaterials make them attractive for advanced high‐performance materials, but their role in promoting toughness has been unclear. Fabrication challenges often prevent the proper organization of nanomaterial constituents, and inadequate testing methods have led to a poor knowledge of toughness at small scales. In this work, the individual roles of nanomaterials and nanoarchitecture on toughness are quantified by creating lightweight materials made from helicoidal polymeric nanofibers (nano‐Bouligand). Unidirectional ( = 0°) and nano‐Bouligand beams ( = 2°–90°) are fabricated using two‐photon lithography and are designed in a micro‐single edge notch bend (µ‐SENB) configuration with relative densities between 48% and 81%. Experiments demonstrate two unique toughening mechanisms. First, size‐enhanced ductility of nanoconfined polymer fibers increases specific fracture energy by 70% in the 0° unidirectional beams. Second, nanoscale stiffness heterogeneity created via inter‐layer fiber twisting impedes crack growth and improves absolute fracture energy dissipation by 48% in high‐density nano‐Bouligand materials. This demonstration of size‐enhanced ductility and nanoscale heterogeneity as coexisting toughening mechanisms reveals the capacity for nanoengineered materials to greatly improve mechanical resilience in a new generation of advanced materials.

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Spatial programming of defect distributions to enhance material failure characteristics

Cited by 14 publications

References 29 publications

Optimized Hierarchical Structure and Chemical Gradients Promote the Biomechanical Functions of the Spike of Mantis Shrimps

Optimized Hierarchical Structure and Chemical Gradients Promote the Biomechanical Functions of the Spike of Mantis Shrimps

Direct ink writing of tough, stretchable silicone composites

Toughness Amplification via Controlled Nanostructure in Lightweight Nano‐Bouligand Materials

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