Torsion stiffness

Torsional Stiffness (Torsion Constant). Torsional stiffness of a body is appHed torque (N-m) divided by angle of twist (rad). Its SI unit is N-m/rad. 

Calistrat, M.M., and Leaseburge, G.G., Torsional Stiffness of Interference Fit Connections, American Society of Mechanical Engineers, Pub. 72-PTG-37. 

BENDING STIFFNESSES, (EI) (EI)y POLAR BENDING STIFFNESS, (El)p TORSIONAL STIFFNESS, (GJ) ... 

The calculation for torque is a primary example of a single degree of freedom in a mechanical system. Figure 43.15 represents a disk with a moment of inertia, /, that is attached to a shaft of torsional stiffness, k. 

Torsional stiffness is defined as the externally applied torque, T, in inch-pounds needed to turn the disk one radian (57.3°). Torque can be represented by the following equations ... 

These moieties (particularly (5.95b)) are prominent in protein chemistry, and mechanisms for controlling their torsional stiffness have obvious potential implications for protein-folding processes. 

Baz, A., and T. Chen, Torsional stiffness of nitinol-reinforced composite drive shafts. Composites Eng., 3, 1119 (1993). 

Because of their lower level of crystallinity these copolymeis soften at lower temperatures than polyethylene. Table I compares the torsional stiffness at various temperatures of an 18% ethyl acrylate-82 % ethylene copolymer with that of a 21,000 molecular weight, 0.918 density polyethylene made by high pressure polymerization (Bakelite DYNH, Union Carbide Corp.). 

Creep testing was performed on a Clash-Berg Torsion Stiffness Tester. Silicone oil was used as the heat transfer medium. Temperatures were held constant to within + 1... 

The magnitude of the changes in longitudinal and torsional stiffness of wool caused by rupturing disulfide bonds is very dependent on the relative humidity used for stressing the fibers. In dry fibers the effects of disulfide rupture are small or not apparent (Harris and Brown, 1946 Feughelman, 1963 Feughelman and Mitchell, 1964). 

Studies of creep as a function of time and temperature were carried out using a Gehman Torsional Stiffness Tester (32). Creep... 

The bending and torsional stiffness of a car body is mainly provided by the hollow tubes that surround the passenger compartment. These have complex cross sections, but, to simplify the analysis, can be considered as... 

A cross-ribbed design only provides stiffening in the two rib directions. There is a low bending stiffness along a direction at 45° to the ribs, and a low torsional stiffness. An isotropic stiffened plate needs ribs in at least... 

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