Response of Chiral Auxetic Composite Sandwich Panel to Fragment Simulating Projectile Impact

Novak, Nejc; Vesenjak, Matej; Kennedy, Greg; Thadhani, Naresh N.

doi:10.1002/pssb.201900099

Cited by 27 publications

(13 citation statements)

References 33 publications

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“…The latter equation might contribute to studies concerning soft impact in composite materials [24,58].…”

Section: Monolithic Multilayer (Composite Armor) Penetration Distance Modelmentioning

confidence: 99%

“…Concerning metamaterials to enhance energy absorption of suspension component made of soft polymer core involved with ceramic outer plate, e.g. the metamaterials are engineered properties of cellular repeating materials pattern [58][59]. Based on the study done by Varma and Sarkar [59], implementing the 3-modes (bending, shear, and stretch) metamaterial energies expressions [59] into (1) together with ( 15) and ( 21)-( 22), yields the physical relations that appropriate for the case of metamaterials armor penetration case.…”

Section: Monolithic Multilayer (Composite Armor) Penetration Distance Modelmentioning

confidence: 99%

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On Analytical Ballistic Penetration Fundamental Model and Design

Nagler¹

2021

1790-5044

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This paper presents a new fresh theoretical study of the ballistic penetration phenomena into hard materials due to low-energy bodies' motion. This model based on the energy balance between the kinetic energy of the piercing body and the protective body thermal energy. Following this equilibrium alongside the equation of the projectile motion, the resulting deceleration value is analytically calculated. Substituting the obtained deceleration value into the kinematic equilibrium results with the penetration thickness expression as well as the time of penetration inside the mono and multi layers materials (like, monolithic and composite materials). In addition, equivalently to the Johnson-Cook model, a proposed impact stress for penetrative and non-penetrative cases was developed. Additionally, a residual velocity expression alongside the evaluation of the total energy and deceleration parameters were also determined. Key parameters are the projectile effective length, which defines the projectile geometry alongside the material strength parameters (heat capacity, Yield, compressive and tensile strengths). Finally, good numerical agreement (order of magnitude and numerical values) has been found between various literature experimental tests and current analytic solution for the kinematic parameters.

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“…The latter equation might contribute to studies concerning soft impact in composite materials [24,58].…”

Section: Monolithic Multilayer (Composite Armor) Penetration Distance Modelmentioning

confidence: 99%

Section: Monolithic Multilayer (Composite Armor) Penetration Distance Modelmentioning

confidence: 99%

On Analytical Ballistic Penetration Fundamental Model and Design

Nagler¹

2021

1790-5044

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“…In comparison to static responses, the dynamic behaviour of auxetics-such as the response to puncture, projectile impact, impact and blast resistance, energy absorption, dynamic crushing and related problems-has not been widely studied. Nevertheless, the dynamic response of auxetic structures has been investigated by Strek et al [24], Michalski et al [25,26] and Novak et al [27,28]. Blast resistance of sandwich panels with auxetic core was investigated by Michalski et al [25,26] and Novak et al [27].…”

Section: Introductionmentioning

confidence: 99%

Metamaterials with Poisson's ratio discontinuity by means of fragmentation–reconstitution rotating units

Lim

2023

Proc. R. Soc. A.

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This paper presents for the first time two types of metamaterials based on the fragmentation–reconstitution of rotating units in order to produce Poisson's ratio discontinuity at the original state. For both metamaterials, each rotating unit takes the form of a rhombus that comprises eight sub-units. During on-axis stretching, each rhombus fragments into eight rotating sub-units. When the prescribed strain is reversed, these eight sub-units reconstitute back into a single rotating rhombus such that they rotate as a rigid body. Using geometrical construction, the incremental Poisson's ratio was established at the original state. In the case of large deformation, the finite Poisson's ratio was formulated in conjunction with the maximum allowable rotations for full stretching along both axes and for full compression. The family of on-axes Poisson's ratio versus rotational angles for various shape descriptors displays a fork-shaped distribution with discontinuity at the original state. Two major distinguishing factors of these metamaterials—property discontinuity at the original state with constant and variable Poisson's ratio under compression and tension, respectively—allow them to function in ways that cannot be fully performed by conventional materials or even by auxetic materials and metamaterials.

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“…[19,20] In this work, we use the more recent classification [20] which distinguishes between nonauxetics, partial auxetics, and auxetics. Vast potential applications of auxetic materials drive the theoretical and experimental investigations, which branch into auxetic metamaterials, [21][22][23][24][25][26][27][28] models, [16,[29][30][31][32][33][34][35][36][37][38][39][40][41] structures, [42][43][44][45][46][47][48] polymers, [49,50] composites, [51] foams, [52][53][54] and fabrics. [55][56][57][58] Most of the research on auxetics is focused either on developing new materials or searching for auxetic properties in existing ones.…”

Section: Introductionmentioning

confidence: 99%

Poisson's Ratio of f.c.c. Hard‐Sphere Crystals with Cubic Supercells Containing Four Nanochannels Filled by Hard Spheres of Another Diameter

Narojczyk

Tretiakov

Wojciechowski

2022

Physica Status Solidi (b)

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It is known that a face centered cubic (f.c.c.) crystal of identical hard spheres containing a periodic array of nanochannels, oriented along one of the principal crystallographic directions and filled by hard spheres of another diameter, shows a significant decrease of its Poisson's ratio with respect to pristine crystal. This indicates an essential enhancement of auxetic properties by such nanoinclusions. The present work describes studies of the f.c.c. hard‐sphere crystal containing four nanochannel arrays, oriented along the [ 111 ] direction and its images with respect to cubic symmetry group transformations and selected in such a way as to not affect the symmetry of the crystal. The elastic properties of the current model are analyzed under different thermodynamic conditions and for different sizes of inclusions. These studies reveal that the auxetic properties of the system vanish when the diameters of inclusion spheres are greater than the ones forming the matrix f.c.c. crystal and, in the case of the widest nanochannels, also when these diameters are smaller. The studies are performed by Monte Carlo computer simulations in the isothermal–isobaric (NpT) ensemble, using the Parrinello–Rahman approach.

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Response of Chiral Auxetic Composite Sandwich Panel to Fragment Simulating Projectile Impact

Cited by 27 publications

References 33 publications

On Analytical Ballistic Penetration Fundamental Model and Design

On Analytical Ballistic Penetration Fundamental Model and Design

Metamaterials with Poisson's ratio discontinuity by means of fragmentation–reconstitution rotating units

Poisson's Ratio of f.c.c. Hard‐Sphere Crystals with Cubic Supercells Containing Four Nanochannels Filled by Hard Spheres of Another Diameter

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