Sliding displacements

To show that boundary sliding must participate in the diffusional creep to maintain compatibility, suppose that all of the SA, SB, and Sc sliding displacements are zero. Equations 16.44 require that the LA, LB, and Lc must also vanish. Therefore, nonzero Sl s (sliding) are required to produce nonzero grain-center normal displacements. 

Dynamic contact between two bodies (e.g., one sliding over the other) generates noise that is characteristic of the hardness of these bodies and of the physical and chemical properties of their interface. Moreover, the velocity of the sliding movement modifies the frequency band of the emitted acoustic waves. The sliding displacement of a finger at the surface of the skin for assessing its smoothness... 

Ci Parameters found in the paper by Hutchinson and Jensen — Table 1.2 V Sliding displacement... 

Figure 12. Shear stress (left) and heat flow (right) vs sliding displacement for strong (e /eo=1.0) and weak (e,/eo=0.1) interfecial interactions at 7=20 K [14]. The "zero" heat flow line, in lower right box, was added by Singer [94].

Fig. 12.9. Interplanar potential for opening and sliding displacements. This potential is for opening on the 001 plane of Al, and sliding within that plane along the [ 110] direction (adapted from Miller and Phillips (1996)).

Here, we limit our attention to scenarios where 0, which essentially eliminates combinations of materials with comparable—but not identical—stiffness. Note that is identically zero for identical materials. When jS 0 the crack tip fields are analogous to those in a homogenous material (i.e., the crack tip stresses scale as Oy 1 / ) and Kj and Kjj dictate the contributions of opening and sliding displacements, respectively (or normal and shear stresses). If 0, the opening and sliding modes are coupled and crack advance criteria require additional parameters [31,32],... 

For example, it can be found in Figure 8 that the assumption of planar failure surface overestimates the critical acceleration values (k g ) to the extent of 11.52% for = 30°. In addition, for a constant value of k = 0.46 and

planar failure mechanism predicts the magnitude of sliding displacement (-9) value as 10 cm, whereas composite failure mechanism predicts S value as 70 cm, the difference reaches as high as 85.71%. It may be noted in Figure 9 that the assumption of planar failure surface overestimates the value of k and difference reaches as high as 34.48% for 4> = 30°, and further for a constant value of = 0.40, planar failure mechanism predicts a rotational displacement (6) of 2.0°, whereas compos-... 

Figure 8. Comparison of sliding displacements (S) estimated using planar and composite failure mechanisms for different k and (j) values.

Basha, B. M., Babu, G. L. S. (2009). Computation of sliding displacements of bridge abutments by pseudo-dynamic method. Soil Dynamics and Earthquake Engineering, 29(1), 103-120. doi 10.1016/j.soildyn.2008.01.006... 

The response and failure of all specimens was flexure-controlled, without shear distress of the web nor marked opening or sliding displacements at the interface of the web and the beams and columns. 

Wang, J.D., Bai, M X., Xiao, S.F. 2001. A study of compound mechanism of earthquake-related sliding displacements on gently inclined loess slope. Chinese Journal of Geotechnical Engineering 23(4) 445-449 (in Chinese). 

Furthermore, there is an important coefficient of mechanical friction fip, which results from the sliding displacement between solids in contact, which is distinct from the viscous friction. 

The locus of the relative displacement calculated from the computational results is shown in figure 8. The rigid body predictions (equations (2)) are also shown. This relative displacement takes place both when fee two surfaces are in contact (and the pressure is therefore non-zero) and also during the period when fee surfaces are separated. The former comprises sliding displacement ( slip ) and may contribute to wear, whereas fee latter has no such effect. 

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