Strip modulus

The maximum vibratory stress in the base material of the strip hybrids due to periodic excitations with three different fi-equencies is plotted versus reinforcing strip modulus in Figure 6.14. The maximum vibratory stress in the base material varies nonlinearly and decreases... 

REINFORCING STRIP MODULUS, msi Figure 6.16 Maximum impulse displacement... 

Strip modulus effects on the structural response of a panel made from strip hybrid composite and subjected to static and dynamic loading conditions. 

Empirical attempts have been made to relate strip and grab test results, particularly for cotton fabrics, so that if one strength is known, the other can be calculated. The relationship is complex, depending on fiber strength and modulus, yam size and crimp, yam-to-yam friction, fabric cover factor, weave, weight, and other factors (19). 

Asphalt concrete is properly proportioned to resist the potentially damaging effects in the road. Asphalt concrete paving mixtures should be evaluated for the following properties stability, flow, air voids, stripping resistance, resilient modulus, compacted density, and unit weight. Table 4.18 provides a list of standard laboratory tests that are presently used to evaluate the mix design or expected performance of fresh and hardened asphalt concrete. 

At high frequencies of 104 to 107 Hz, Young s modulus of fibers and film strips can be measured by wave propagation techniques (16,49-53). An appropriate equation when the damping is low is... 

A glass fiber mat in which the fibers appear to be randomly oriented is impregnated with a thermosetting resin and cured. Strips are cut from the sheet in different directions, and their Young s modulus is measured. The Young s moduli are not the same in different directions. If the differences are much greater than the expected experimental errors, what is the most probable cause of the difference in moduli ... 

For rigid materials, measuring modulus and strength in flexure is almost as commonly practised as tensile tests. Its popularity is largely due to the fact that a strip is easier to produce than a dumbbell and there are no gripping problems. It can also be argued... 

Kalyanasundaram, Kumar, and Kuloor (K2) found the influence of dispersed phase viscosity on drop formation to be quite appreciable at high rates of flow. The increase in pd results in an increase in drop volume. To account for this, the earlier model was modified by adding an extra resisting force due to the tensile viscosity of the dispersed phase. The tensile viscosity is taken as thrice the shear viscosity of the dispersed phase, in analogy with the extension of an elastic strip where the tensile elastic modulus is represented by thrice the shear elastic modulus for an incompressible material. The actual force resulting from the above is given by 3nRpd v. 

The numerical case given is fgr a 20-tray column with 10 trays in the stripping section. A constant relative volatility of 2 1 used. The column steadystate profile is given in Table 12.3, together with the values of coefficients and the transfer functions in terms of log modulus (decibels) and phase angle (degrees) at frequencies from 0 to 10 radians per minute. The values at zero frequency are the steadystate gains of the transfer functions. 

The photoelastic measurements were carried out in simple extension using strip specimens. In addition to the force/ also the optical retardation S (hence also the birefringence An <5) could be determined and the modulus G, the deformational-optical function A and the stress-optical coefficient C = A/G were calculated using the equations [31]... 

In principle, the shear modulus could be measured using test pieces strained in torsion and in engineering practice components, such as torsion discs and bushes, do operate in this mode. However, it is not common practice to test rubber in this manner except as a low temperature test (see Chapter 15) when a strip test piece is twisted by means of a torsion wire. The instrument traditionally used is not really accurate enough for precise measurement of modulus at room temperature but it would seem reasonable to suppose that an accurate instrument could be devised. 

Modulus can be obtained from rotational stiffness by using the formula for static torsion of a strip test piece ... 

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