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• W2990587895 abstract "Nature has been adopted several techniques tosurvive over the past billion years of evolution. Geometrically patternedinterfaces seem to be a common motif in Nature. In particular, architectureplays a crucial role in increasing the strength, toughness, and damagetolerance among different species. For instance, alligator, turtle, armadillo,sea urchin, ammonite, Ironclad beetle, and boxfish are among species includedpatterned interfaces inside their structure. Here, the role of shape, geometry,and microstructure of both interlocking and non-interlocking patternedinterfaces inspired by Nature is investigated in enhancing the mechanicalproperties under multiaxial loading conditions.Therole of non-interlocking patterned interfaces is studied under remote mode-Iloading conditions. In particular, the role of the shape of the opening crackbehind the crack tip is investigated as the crack propagates along theinterface. The shape of the interface behind the crack tip for differentamplitude-to-wavelength aspect ratios is studied by comparing the results fromtwo analytical models with finite element simulations through the J-integralmethod. Additionally, the role of the material length scale is explored byinvestigating the relationship between the geometrical characteristic lengthsand the emerging material length scale using a finite-element-based cohesivezone model. The results suggest that geometrical toughening is influenced by asize effect, but it is bounded between two extreme conditions.Therole of interlocking patterned interfaces is investigated for both boxfishcarapace and Ironclad beetle cuticle. These two species are selected due totheir extraordinary performance against attack and compression loads, which arefatal to the other species. The boxfish carapace (Lactoria cornuta) containshexagonal dermal scutes, a combination of the brittle hexagonal plate(hydroxyapatite) on top of a very compliant (collagen) material. While themineral plates are separated by patterned sutures (triangular patterns), thereis no interphase material connecting them. Instead, the connection betweenmineralized plates is done through the collagen base which is different from othernaturally occurring sutures (e.g., sutures in turtle, alligator, armadillo).The protective role of the boxfish scute architecture in controlling the crackdirections is investigated by employing analytical, numerical, and experimentaltools for different geometrical and material parameters. Further analysisrevealed that this architecture helps to arrest the cracks inside the suturesarea. Additionally, the results confirmed that both architecture and materialproperties play a key role in controlling the direction of the crack inside thebrittle plates.Beetlesare a subclass of arthropod dating back over 300 million years. The complexcuticle microstructure found within the exoskeleton (elytra) of this speciallyadapted insect results in extremely high compressive resistance, far beyond anyother beetle identified to date. Elytra consists of separated parts connectedusing dovetail-joints blades and contains a hierarchical assembly ofalpha-chitin fibers embedded within a proteinaceous matrix that provides bothstrength and toughness. The architecture of the suture region of the elytra,modified for terrestrial living, has a unique architecture consisting ofspecially modified interlocking blades, whose elliptical geometry, laminatedmicrostructure, and frictional interfacial features, enhance mechanicalproperties such as toughness and load resistance. The presence ofmicrostructure inside the interlocking joints results in delamination insideblades and, thus, develops a new competing mechanism that is different frompull out or fractures. By using a combination of finite element analysis,experimental methods (i.e., optical and electron microscopy, computedtomography, and mechanical testing), and 3D printing prototype technique, theunique adaptations, novel architectural design features and interfacialstructures are revealed within the exoskeleton of Ironclad beetle. The resultsfrom FE simulations and experiments confirmed that the ellipse shape for theblade has priority over the circular shape in terms of mechanical properties.Besides, including laminated architecture inside the blade’s geometry canincrease the toughness of the system up to three times in comparison to thehomogenous blades, and this method is beneficial for the materials with limitedductility. Thus, this model system represents a tough, resistance biologicalmaterial that exemplifies a departure from other types of beetles and can beinspired for future engineering applications." @default.
• W2990587895 created "2019-12-05" @default.
• W2990587895 creator A5018859313 @default.
• W2990587895 date "2019-12-02" @default.
• W2990587895 modified "2023-09-23" @default.
• W2990587895 title "On the Mechanics of Non-Interlocking and Interlocking Patterned Interfaces Inspired by Nature" @default.
• W2990587895 doi "https://doi.org/10.25394/pgs.11295824.v1" @default.
• W2990587895 hasPublicationYear "2019" @default.
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