The Development of a New Shock Absorbing Uniaxial Graded Auxetic Damper (UGAD)

Abstract

Auxetic structures are efficient cellular materials that can absorb blast/impact energy through plastic deformation, thus protecting the structure. They are developing sacrificial solutions with light weight, high specific strength, high specific toughness and excellent energy dissipating properties, due to its negative Poison’s ratio nature. The use of auxetic and non-auxetic panels in blast resistant structures had been relatively perceived by researchers. Nonetheless, implementation of those energy dissipaters, explicitly as a uni-axial passive damper is restrained to limited studies, which highlight the potential need for further explorations. The aim of this paper is the design of a new uniaxial graded auxetic damper (UGAD) that can be used as a blast/impact/shock absorber in different scales for different structural applications. First, the geometry, material, numerical model and loading are introduced. Then, a detailed parametric study is conducted to achieve the most efficient graded auxetic system. Moreover, the designed auxetic damper is numerically tested and its static and dynamic constitutive relations are derived and validated analytically. The selection of optimum parameters was based on the ratio of the reaction force to the applied load (RFd/P) and plastic dissipation energy (PDE). The final designed UGAD contains three auxetic cores that have the same geometry, material grade (6063-T4), size and number of layers equal to eight. The cell-wall thickness t of the three auxetic cores is 1.4 mm, 1.8 mm and 2.2 mm, respectively; composing a graded auxetic system. The performance of the three auxetic cores together have led to a wide plateau region (80% of total crushing strain) and variant strength range (1–10 MPa), which in return, can justify the superior performance of the UGAD under different blast levels. Finally, the 3D printed prototype of the UGAD is presented and the possible applications are covered.

Modeling the Mechanical Response of Auxetic Metamaterials to Dynamic Effects

“…Возрастание поглощенной механической энергии при динамическом сжатии ячеистых ауксетических структур определяется преимущественно работой эквивалентных сдвиговых напряжений на пластических деформациях. Полученные результаты находятся в хорошем согласии с данными об адсорбированной энергии при сжатии и сдвиге различных конструкционных сплавов и перспективных ячеистых структур [33,37].…”

Controllable Hierarchical Mechanical Metamaterials Guided by the Hinge Design

“…Over the years, these systems have been thoroughly analysed from the point of view of their potential to exhibit unusual mechanical properties such as auxetic behaviour [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ], negative compressibility [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ] and negative stiffness [ 21 , 22 , 23 , 24 , 25 , 26 ]. This large and continuously growing interest of the research community in the mechanical metamaterials stems from the fact that their unusual mechanical properties can be utilised in numerous applications ranging from biomedical [ 27 ] to soundproofing [ 28 , 29 ] and protective devices [ 30 , 31 , 32 , 33 ].…”

Negative Compressibility in Hexagonal and Trigonal Models Constructed by Hinging Wine‐Rack Mechanism

“…Metamaterials are artificially created materials with novel properties owing mainly to their microstructure geometry rather than the material composition. [1] In the past few decades, mechanical metamaterials with negative property have garnered considerable attention from researchers due to their particularity and the potential for being widely used in engineering applications, such as soundproofing, [2][3][4] protective [5][6][7] and biomedical [8] devices, and damping mechanisms. [9][10][11] So far, these studies have mainly focused on negative Poisson's ratio, [10][11][12][13][14][15] negative thermal expansion, [16][17][18] negative stiffness, [19,20] and negative compressibility.…”