Contacts strength

An increase of the contact strength with the decrease of water layering is confirmed experimentally. For example, it was stated that the strength of raw material formed from wetted bentonite is determined by the equation ... 

Due to the small amplitude of excitation, the contacts are not usually broken. The QCM is a device for non-destructive testing of interfacial contacts. The evolution of the contact strength with time, temperature, exposure to solvent vapor, or vertical pressure can be monitored without ever breaking a bond. 

Fig. IX-18. Schematic representation of a device for measurement of contact strength in liquid media a, b - samples 1 - magnetoelectric dynamometer 2,3 - holders 4 - manipulator, 5 - container with a liquid [16,17]...

Fig. IX-21. The histograms showing the distribution of contact strength between two crystals of calcium sulfate dihydrate in supersaturated calcium sulfate solutions upon varying a - the degree of solution supersaturation, and b - duration of contact, t [16,17]...

Contacts between Cellulose Fibers The Evaluation of Friction Forces and Contact Strength The Effect of Common Papermakinc Chemicals... 

Typical experiments can be carried out in the following manner Two crystals are brought into contact in a given medium and are kept under the conditions necessary to form a contact. Such conditions include contact time, compression, solution supersaturation, temperature, and the presence of surfactants. After the contact has been formed, the crystals are forced to separate from each other, and the contact strength, p is measured. 

It is worth noting here that the case of sintering is principally different this is a nonbarrier diffusion process, and the histograms of the contact strength have a single maximum that shifts with an increase in temperature as shown in Figure 6.2. 

FIGURE 6.6 The differential distribution of the contact strength for the contact between two gypsum dehydrate crystals brought into edge-to-edge contact with a force,/=10 dyn, in solutions of calcium sulfate the various degrees of supersaturation, a, for the contact time t = 100 s (a) the various contact times, t, for supersaturation, a = 1.8 (b). The ordinate depicts the density of the distribution, p. 

As in the case of gypsum, the values of the contact strength, p, measured under a fixed set of conditions (pH, /, a, and t) are spread over a very broad range, as can be seen in the histograms shown in Figure 6.10. In the case of the silica-coated glass rods, the histograms also show a sharp... 

FIGURE 6.10 Histograms showing the differential distribution of the contact strength, p, between silica-coated rods in supersaturated silicic acid solutions at pH 7, with the compressive strength/= 10 dyn, and for... 

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