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    Fracture Toughness of Biological Composites With Multilevel Structural Hierarchy

    Source: Journal of Applied Mechanics:;2020:;volume( 087 ):;issue: 007
    Author:
    Wang, Fan
    ,
    Liu, Kui
    ,
    Li, Dechang
    ,
    Ji, Baohua
    DOI: 10.1115/1.4046845
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: It is well known that the biological composites have superior mechanical properties due to their exquisite multilevel structural hierarchy. However, the underlying mechanisms of the roles of this hierarchical design in the toughness of the biocomposites remain elusive. In this paper, the deformation and fracture mechanism of multilevel hierarchical structures are explored by molecular dynamics simulations. The effects of the multilevel design on fracture toughness, nonlinear deformation of soft matrix, and the crack path pattern were quantitatively analyzed. We showed that the toughness of composites is closely associated with the pattern of the crack path and the nonlinear deformation of the matrix. Additionally, the structure with a higher level of hierarchy exhibit higher toughness, which is less sensitive to the geometrical change of inclusions, such as the aspect ratio and the staggered ratio. This work provides more theoretical evidence of the toughening mechanism of the multilevel hierarchy in fracture toughness of biological materials via new methods of analyzing fracture of multilevel structures and provides guidelines for the design of high-performance engineering materials.
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      Fracture Toughness of Biological Composites With Multilevel Structural Hierarchy

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    contributor authorWang, Fan
    contributor authorLiu, Kui
    contributor authorLi, Dechang
    contributor authorJi, Baohua
    date accessioned2022-02-04T14:16:06Z
    date available2022-02-04T14:16:06Z
    date copyright2020/04/21/
    date issued2020
    identifier issn0021-8936
    identifier otherjam_87_7_071004.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4273310
    description abstractIt is well known that the biological composites have superior mechanical properties due to their exquisite multilevel structural hierarchy. However, the underlying mechanisms of the roles of this hierarchical design in the toughness of the biocomposites remain elusive. In this paper, the deformation and fracture mechanism of multilevel hierarchical structures are explored by molecular dynamics simulations. The effects of the multilevel design on fracture toughness, nonlinear deformation of soft matrix, and the crack path pattern were quantitatively analyzed. We showed that the toughness of composites is closely associated with the pattern of the crack path and the nonlinear deformation of the matrix. Additionally, the structure with a higher level of hierarchy exhibit higher toughness, which is less sensitive to the geometrical change of inclusions, such as the aspect ratio and the staggered ratio. This work provides more theoretical evidence of the toughening mechanism of the multilevel hierarchy in fracture toughness of biological materials via new methods of analyzing fracture of multilevel structures and provides guidelines for the design of high-performance engineering materials.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFracture Toughness of Biological Composites With Multilevel Structural Hierarchy
    typeJournal Paper
    journal volume87
    journal issue7
    journal titleJournal of Applied Mechanics
    identifier doi10.1115/1.4046845
    page71004
    treeJournal of Applied Mechanics:;2020:;volume( 087 ):;issue: 007
    contenttypeFulltext
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