Poisson’s ration

Ef = true fracture strain u = Poisson s ration < uts = ultimate tensile strength (7ys = tensile yield strength... 

Tool material Density (mg/m) Hardness Transverse rupture strength (MPa) Fracture toughness (MNm- / ) Young s modulus (GPa) Poisson s ration Thermal expansion (10- /K) Thermal conductivity (W/mK) Thermal shock parameter... 

The quantitative evalnation of crystalline regions contribution in HDPE elasticity can be performed within the framework of yield fractal conception [17], according to which the valne of Poisson s ration in yield point can be estimated as follows ... 

Fig. 4 Elastic moduli of two types of cable network, (a) A triangular lattice network and designated test region (green) in the middle, (b) Network in (a) is stretched horizontally, (c), (d) Unstretched and stretched square lattice network, (e) Young s modulus E determined from the stretching experiment for both types of network, plotted as a function of number of nodes in the test region. Note that, a prestressed network has a larger Young s modulus, (d) Poisson s ratio a for triangular and square lattice networks. Clearly, prestress reduces the Poisson s ration for both types of network.

Poisson s Ration n (for S. Poisson symbol p or v) In a material under tensile stress, the ratio of the transverse contraction to the longitudinal elongation. For metals, Poisson s ratio is bout 0.3, for concrete, 0.1. For many... 

When a material is stretched, one of the dimensions increases and the other two will decrease. The ratio between the changes in the linear strain produced in the perpendicular direction (Cp, ), due to the tensile stress producing the tensile strain (e), is called the Poisson s ration (w), and is defined by ... 

Figure 8.5 Radial displacements -Ar/6 for different values ofthe Poisson s ration for indentation of an elastic half-space by a flat cylindrical punch with contact radius a.

For the simulation of isotropic thermoplastics elasto-viscoplastic material models are used. They are composed of an elastic part consisting of a constant Young s modulus and Poisson s ration and a plastic part being described by true stress/strain-curves depending on the true plastic strain-rate. As a failure criterion a maximal endurable hydrostatic stress, a critical equivalent plastic strain or a combination of these can be used. The strain criterion can also be set as a function of the strain-rate. 

Pipe strain is a function of pipe wall thickness, pipe diameter, Poisson s ration for the pipe material, and the mounting conditions. Mounting conditions include how the ends of the pipe are constrained, fixed or free. The wave speed of the polymer, a, is adjusted to account for the calculated effect of fte pipe strain [4.] Also, forces on the flow in the pipe include inlet and exit pressures, inertia, and viscous friction. 

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