Shear value

Load bearing capabiUties are dependent upon the adherend, joint design, rate of loading, and temperature. Values given represent the type of adherends normally used at room temperature. Lap shear values approximate those obtainable from an overlap of 3.2 cm. ... 

A general virial equation can be written for the specific viscosity when the zero-shear value is expressed in its specific form ... 

Maferials fhaf already are pressure-sensifive adhesives, buf can be modified by radiation (UV or EB) to infroduce or increase cross-linking, which increases their adhesive properties, shear value, peel strength, service temperature range, and solvent resistance... 

The properties of i (0) for narrow distribution polymers have already been discussed in Section 5. The behavior of f jfy) at higher shear rates has only been determined for a few systems of well-characterized molecular structure. The experimental problems are more difficult than in the case of rj(y), so the conclusions here must be regarded as somewhat more tentative. Experimentally, t(y) and tj(y) depart from their zero shear values within the same range of shear rates (172). Shear rate sensitivity is much smaller when N is expressed as a function of shear stress (350). 

Initial bondability of anodized surfaces was tested in the lap shear configuration using numerous commercial epoxy adhesives. With one exception, all surfaces proved to be bondable and gave acceptable lap shear values. That exception was an anodized film formed... 

These reactive hybrid epoxy-urethane adhesives were developed initially for bonding to oily cold-rolled steel, but they have given good results on other substrates as well. It is believed that the oil contaminant on the substrate is adsorbed into the uncured adhesive and acts as a plasticizer. Table 7.9 shows tensile shear values obtained after curing 20 min at 177°C on various untreated substrates. The epoxy-urethane adhesives resist hydrolysis and give useful bond strengths up to about 100°C. 

These coefficients, along with the shear viscosity rj = cyii/y, often approach constant values at low shear rates these are called the zero-shear values, rjo, 4>i,o, and 4 2,o- Figure 1-9 shows for a polyethylene melt that the zero-shear constant values of rj r]o and 4 1 — 4/1,0 are approached at low shear rates. For a viscoelastic simple liquid with fading memory, the zero-shear values of the viscosity and first normal stress coefficient are related to the zero-frequency values of the dynamic moduli by... 

Vegetables are acidified by soaking in an acid solution prior to processing, bulk storage in acid solutions, blanching in acid solution or direct addition of an acid brine. Acidifying soak water with citric or malic acid enhances the quality of canned dry beans (12) and dry lima beans (13). The occurrence of splits, drained weights, shear values, color and taste of dry beans were improved. 

Jung, S., Ghoul, M., and Lamballerie-Anton, M. De. 2000. Changes in lysosomal enzyme activities and shear values of high pressure treated meat during ageing. Meat Science 56 239-246. 

Torrescano, G., A. Sanchez-Escalante, B. Gimenez, P. Roncales, and J. A. Beltran. 2003. Shear values of raw samples of 14 hovine muscles and their relation to muscle collagen characteristics. Meat Science 64 85-91. 

PMN Assays. Leukocytes in suspension were quantitated by electronic particle counting to determine the changes induced by mechanical trauma. Values obtained after incubation with drugs or with saline were the baseline values to which post shear values were related. 

For a cyhndrical skirt of normal length welded to the bottom head, the critical stress will usually be the shear value of the weld. The code allows a stress in shear of 45% of the stress in tension. Thus, allowable stress in the weld for A-283 Gr. C plate is... 

This test is a measure of the ability of a pressure-sensitive adhesive to withstand ereep. A standard area of coated film is bonded to a steel plate and a weight suspended from it. The assembly is plaeed in an oven. In some shear tests the time for the assembly to delaminate at a fixed temperature is recorded, while in other tests the temperature at which failure occurs when the oven temperature is increased at a certain rate is the shear value quoted. 

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