Elastic strength

The study of composite materials actually involves many topics, such as, for example, manufacturing processes, anisotropic elasticity, strength of anisotropic materials, and micromechanics. Truly, no one individual can claim a complete understanding of all these areas. Any practitioner will be likely to limit his attention to one or two subareas of the broad possibilities of analysis versus design, micromechanics versus macromechanics, etc. 

Elastic Strength Pressure (ESP). Computed true internal gas pressure in a gun at any given cross section thereof that will stress the metal at the inner layer of the wall at that section tangentially up to the max elastic limit of the metal from which the inner layer is made. Normally required to be at least 1.5 times the computed max pressure... 

Elastic Strength Pressure (ESP). The gas pressure that will produce an equivalent stress (based on distortion-energy criteria) at some point in the gun that is equal to the min elastic limit of the material at ambient temp... 

Elastic Strength Pressure (Hot). (ESP [Hot]). A reduced elastic strength pressure the reduction is made to allow for the decreased elastic limit of the gun materials at elevated temps... 

Recent work in the authors laboratory investigated the effects of the molar ratio and the reactive conditions on the elasticity, strength, biodegradation, and thermal processing abilities. The different... 

The important elastic properties of a material undergoing deformation under static tension are stiffness, elastic strength and resilience. For a material obeying Hooke s law, the modulus of elasticity, E (= o/e), can be taken to be a measure of its stiffness. The elastic... 

Autofrettage is also used for strengthening the walls of tubes, cylinders, pressure vessels, etc and it is claimed that it nearly doubles the elastic strength of the walls... 

Vinogradov,G.V., Belkin,I.M. Elastic strength, and viscous properties of polymer (polyethylene and polystyrene) melts. J. Polymer Sci. PL A 3,917-932 (1965). 

Compressive measurements provide a means to determine specimen stiffness, Young s modulus of elasticity, strength at failure, stress at yield, and strain at yield. These measurements can be performed on samples such as soy milk gels (Kampf and Nussi-novitch, 1997) and apples (Lurie and Nussi-novitch, 1996). In the case of convex bodies, where Poisson s ratio is known, the Hertz model should be applied to the data in order to determine Young s modulus of elasticity (Mohsenin, 1970). It should also be noted that for biological materials, Young s modulus or the apparent elastic modulus is dependent on the rate at which a specimen is deformed. 

Key words lattice structure, bonding energy, elasticity, strength, creep resistance, fracture toughness... 

Interpretating the character of the dependence of elastic-strength properties of polymeric compositions on structure, two factors can be taken into consideration at least. Taking into account a defining role of a continuous phase in the formation of properties of a mixture, S-shaped structure-property curve is based on the phase inversion [12],... 

Viscoelasticity - A property of a material that exhibits both elastic and viscous behavior. Viscoelastic materials have both solid-like characteristics—elasticity, strength, and stability of form— and liquid-like characteristics, such as flow that depends on time, temperature, and stress. All plastics exhibit some degree of viscoelasticity. 

The best grades of raw rubbar (pate crepe or smoked sheet) contain about 95% rubber hydrocarbon. The rest consists of proteins (2-3%), acetone-sol resins and fatty acids (2%), small amounts of sugar and a tittle mineral matter. Vulcanization, which consists of heating rubber with ] -3% of sulfur, introduces cross links between chains to produce a three-dimensional lattice of improved elasticity, strength, and temp sensitivity. Accelerators such as zinc dimethyldithiocarbamate greatly decrease the time or lower the temp required for vulcanization. 

True Stress. As set up in the forms for checking stresses and in the derivation of formulas for approximate thickness, the elastic strength under compound stress is determined by maximum principal stresses. This has been done because the ASME Code does not allow the use of true stress for hoop tension, and because some engineers will not allow the use on the longitudinal axis. 

E.W. Wong, RE. Sheehan, and C.M. Lieber, Nanobeam mechanics elasticity, strength, and toughness of nanorods and nanotubes. Science Til, 1971—1975 (1997). 

Ethylene copol nners with vinyl alcohol (PEVA) are derived by saponification of CEVA. Their critical feature is the unique gas barrier property (Table 2.1), which is combined with elasticity, strength, surface hardness, high wear, oil and atmospheric resistance. Thin, strong barrier layers of inhibited films formed from PEVA are impermeable to both Cl and hostile atmospheric vapors and gases [21]. 

---