Undrained cyclic response of a dense saturated sand with various grain sizes and contents of nonplastic fines: Experimental analysis and constitutive modeling

2021 ◽  
Vol 145 ◽  
pp. 106727
Author(s):  
Ling-Yu Xu ◽  
Fei Cai ◽  
Wei-Yun Chen ◽  
Jing-Zhe Zhang ◽  
Dong-Dong Pan ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Constitutive Modeling ◽  
Saturated Sand ◽  
Cyclic Response ◽  
Grain Sizes

Microstructural Effects on the Cyclic Deformation of Polycrystalline FCC Materials

1994 ◽  
Vol 362 ◽  
Author(s):  
P. Peralta ◽  
L. Llanes ◽  
A. Czapka ◽  
C. Laird
Keyword(s):  
Grain Size ◽  
Cyclic Hardening ◽  
Plastic Strain Amplitude ◽  
Model Material ◽  
Cyclic Behavior ◽  
Cyclic Response ◽  
Grain Sizes ◽  
Microstructural Effects ◽  
Fcc Materials ◽  
Similar Texture

AbstractThe effect of crystallographic texture and grain size on the cyclic hardening of FCC polycrystals was studied using copper as a model material. Samples with textures approximately random and two grain sizes were tested under cyclic loading. The cyclic response for high values of the plastic strain amplitude of the random-textured material was softer than that of polycrystals with strong <111>-<100> texture reported in [1], and almost the same at low plastic strains, when similar testing conditions were used. The cyclic behavior of specimens with different grain sizes and similar texture was almost the same as well. This result shows that texture had a much more important effect on the cyclic behavior of polycrystalline copper than the grain size. The effect of ramp loading as a pretreatment was also studied. The results show that large grained samples had a softer cyclic response after the ramp than small grained ones, but the effect was still smaller than that of texture.

Reflection electron microscopy of as-grown diamond surfaces

1993 ◽  
Vol 51 ◽  
pp. 1006-1007
Author(s):  
Z.L. Wang ◽  
J. Bentley ◽  
R.E. Clausing ◽  
L. Heatherly ◽  
L.L. Horton
Keyword(s):  
Electron Microscopy ◽  
Synthetic Diamond ◽  
High Energy ◽  
Dark Field ◽  
Reverse Direction ◽  
Diamond Surfaces ◽  
Grain Sizes ◽  
Synthetic Diamonds ◽  
De Beers ◽  
Reflection Electron Microscopy

It has been found that the abrasion of diamond-on-diamond depends on the crystal orientation. For a {100} face, the friction coefficient for sliding along <011> is much higher than that along <001>. For a {111} face, the abrasion along <11> is different from that in the reverse direction <>. To interpret these effects, a microcleavage mechanism was proposed in which the {100} and {111} surfaces were assumed to be composed of square-based pyramids and trigonal protrusions, respectively. Reflection electron microscopy (REM) has been applied to image the microstructures of these diamond surfaces.{111} surfaces of synthetic diamond:The synthetic diamonds used in this study were obtained from the De Beers Company. They are in the as-grown condition with grain sizes of 0.5-1 mm without chemical treatment or mechanical polishing. By selecting a strong reflected beam in the reflection high-energy electron diffraction (RHEED) pattern, the dark-field REM image of the surface is formed (Fig. 1).

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