On the Young’s modulus of a auxetic composite structure

Novel structure with negative Poisson’s ratio and enhanced Young’s modulus

“…Eventually, this causes limitations on the structural applications of the materials with negative Poisson's ratio [29]. Auxetic composites have been proved to be an available way to obtain materials with high specific strength, stiffness and negative Poisson's ratio [30][31][32][33][34][35][36]. In one approach, carbon double helix yarns are used to reinforce polyester matrix unidirectionally to produce composites with relatively high stiffness (4 GPa) and negative Poisson's ratio of À6.8 at 30% fiber volume fraction [34].…”

Thermal effects in chiral elastic rods

“…1, and if y has the order p, we write y ij.s (p subscripts) for the components of y in the cartesian coordinate system. We shall employ the usual summation and differentiation conventions: Greek subscripts are understood to range over the integers (1,2) whereas Latin subscripts (unless otherwise specified) are understood to range over the integers (1,2,3); summation over repeated subscripts is implied, and subscripts preceded by a comma denote partial differentiation with respect to the corresponding cartesian coordinate.…”

On the Damped Beams with Hysteresis

“…In the auxetic materials the shear modulus is significantly greater then the elastic Young modulus It is well known that all major classes of materials (polymers, composites, metals and ceramics) can exist in auxetic form. A specific feature exhibeted by auxetic materials in comparison with other foams is their significant damping capacity at various loading levels, with increase up to 16 times compared to conventional foams [11][12][13]. The size-dependent theories of the damping capacity of auxetic foams have received increasing attention in recent years due to the need to model and analyse very small-sized mechanical interactions inn the rapid developments of micro-nanotechnologies [14][15][16].…”