Steel Poisson ratios

D = external drill pipe diameter in ft D. = internal drill pipe diameter in ft V = steel Poisson ratio... 

Thus, as an elastomer is compressed in, say, the Z-direction (as in an isolator on a rubber grommet, engine mount, or transmission mount), the mount will deform in the X and Y directions. This value is nearly 0.5 for natural rubbers (typically used for mounts in automotive systems). For steel, Poisson ratios are around 0.3. The Poisson ratio has no units. 

Poisson ratio The ratio of transverse contraction strain to longitudinal extension strain in a stretched bar. The maximum possible value is 0.5 (around 0.5 for rubber, 0.33 for aluminum, 0.28 for common steels, and 0.1-0.4 for polymer foams). 

The designed barrier door is 200 cm long and 200 cm high and 6 cm thick, and consists of three layers—porous metal plate and foam ceramics and porous metal plate. According to the natural and fixed attribute of material itself, elastic modulus is 72Gpa and Poisson Ratio is 0.226. The elastic modulus and Poisson Ratio of metal plate is 206Gpa and 0.3, which is close to steel. 

Other properties common to all carbon- and low-alloy steels types. Young s modulus 201-209 GPa, Coulomb s or shear modulus 81-82 GPa, bulk or compression modulus 160-170 GPa Poisson ratio 0.27-0.30. ... 

Other properties common to all martensitic stainless steel types Young s modulus 204-215 GPa Coulomb s or shear modulus 83.9 GPa bulk or compression modulus 166 GPa Poisson ratio 0.283 specific heat capacity ca. 460 J.kg .K. ... 

Direct stress by itself induces a degree of secondary shear stresses. For each material there is a Poisson ratio v. For steel it is 0.30 and for gray cast iron it is 0.26. Shear strain correlates with shear strain by the modulus of rigidity G (also called shear modulus). It is related to the Young modulus by the Poisson ratio ... 

Figure 4 shows the form of the tensile specimens for both short-term and creep testing. A special anchorage system has been devised consisting of metal plates and machined steel cross bars - Figure 5. Single specimens are tested for short-term strength, stiffness and Poissons ratio.

Example 2.7 A nylon ring with a nominal inside diameter of 30 mm, an outer diameter of SO mm and a width of S mm is to be made an interference fit on a metal shaft of 30 mm diameter as shown in Fig. 2.17. The design condition is that the initial separation force is to be 1 kN. Calculate (a) the interference on radius needed between the ring and the shaft and (b) the temperature to which the nylon must be heated to facilitate easy assembly. What will be the maximum stress in the nylon when it is in position on the shaft The coefficient of friction between nylon and steel is 0.2S. The short-term modulus of the nylon is 1 GN/m, its Poisson s ratio is 0.4 and its coefficient of thermal expansion is 100 X 10- °C- . 

The limiting value of C can be obtained from equations 13.30 and 13.33. Taking Poisson s ratio as 0.3, a typical value for steels, then if the edge can be taken as completely rigid C = 0.43, and if it is essentially free to rotate C = 0.56. 

It can be seen by examination of equations 13.7 and 13.9, that for equal stress in the cylindrical section and hemispherical head of a vessel the thickness of the head need only be half that of the cylinder. However, as the dilation of the two parts would then be different, discontinuity stresses would be set up at the head and cylinder junction. For no difference in dilation between the two parts (equal diametrical strain) it can be shown that for steels (Poisson s ratio = 0.3) the ratio of the hemispherical head thickness to cylinder... 

The material properties used in the simulations pertain to a new X70/X80 steel with an acicular ferrite microstructure and a uniaxial stress-strain curve described by er, =tr0(l + / )", where ep is the plastic strain, tr0 = 595 MPa is the yield stress, e0=ff0l E the yield strain, and n = 0.059 the work hardening coefficient. The Poisson s ratio is 0.3 and Young s modulus 201.88 OPa. The system s temperature is 0 = 300 K. We assume the hydrogen lattice diffusion coefficient at this temperature to be D = 1.271x10 m2/s. The partial molar volume of hydrogen in solid solution is... 

External pressure that by theory will cause collapse, psia Modulus of elasticity of shell, psi Poisson s ratio (usually about 0.3 for steel)... 

For steel in which Poisson s ratio is 0.3, equation 4-5 reduces to... 

A steel rod of diameter 16.2 mm and length 25 cm is subjected to a force of 50 000 N in tension along the long axis. The modulus of elasticity is 210 GPa, and Poisson s ratio is 0.293. Determine (a) the amount that the specimen will elongate in the direction of the applied force and (b) the change in diameter of the rod. 

---