Crashworthiness analysis of a cylindrical auxetic structure under axial impact loading

Impact properties of uniaxially thermoformed auxetic foams

“…Due to the counter-intuitive auxetic deformation, auxetics show some remarkable advantages such as larger indentation resistance [4], shear compliance [5,6], synclastic behavior [7] with respect to enhanced vibration and acoustic absorption [8]. Auxetic materials/structures also show remarkable performances in terms of impact absorption because of the localized deformation behaviour of the material surrounding the impactor [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Negative Poisson's ratio open-cell polyurethane (PU) foams are perhaps one of the most successful examples of auxetic materials physically produced, due to their remarkable mechanical properties and relative straightforwardness in terms of manufacturing [26,27].…”

Extremely stiff and lightweight auxetic metamaterial designs enabled by asymmetric strut cross-sections

“…Ever since re-entrant foams with random internal structures were first studied as an auxetic material [19], there has been a proliferation of studies on different negative Poisson's ratio structures, including re-entrant designs [20][21][22], rotating polygons [23,24], double-V structures [25][26][27], and chiral-type geometries [9,[28][29][30]. Regardless of the classification, auxetic structures, in general, display low stiffnesses compared to rigid stretch-dominated lattices [31], as their deformation has to be bending-dominated [21,[32][33][34][35][36] or joint-rotationdominated [9,37,38] in order for the negative Poisson's ratio to be appreciable.…”

Optimal design of a novel crash box with functional gradient negative Poisson’s ratio structure

“…A kind of variable thickness wing with the inner core of the same structure was further designed. Gao et al 10 adopted the numerical methods to research the crashworthiness of a new type of cylindrical auxetic structure through axial impact condition and drew the conclusion that the adopted NPR structure would extend outward from the mid with overlarge number of layers and cells. Wang et al 11 adopted the bionic NPR structure to the impact energy absorption structure of aircraft and filled the NPR structure into its inner cavity to effectively improve the comprehensive impact resistance and energy absorption performance.…”