scholarly journals Shear failure properties of compacted bentonite under unsaturated and saturated conditions

2009 ◽  
Vol 4 (1) ◽  
pp. 59-69 ◽  
Author(s):  
Takeshi KODAKA ◽  
Yuko TERAMOTO
Keyword(s):  
Shear Failure ◽  
Compacted Bentonite ◽  
Failure Properties

Shear failure development in compacted bentonite specimens

2010 ◽  
pp. 29-33
Author(s):  
Takeshi Kodaka ◽  
Yuko Teramoto ◽  
Toshio Hirate ◽  
Yasuhisa Motoyoma ◽  
Yosuke Higo ◽  
...  
Keyword(s):  
Shear Failure ◽  
Compacted Bentonite

Effect of Air Position to the Mechanism of Air-Decked Blasting

2011 ◽  
Vol 328-330 ◽  
pp. 1167-1171
Author(s):  
Liang Wu
Keyword(s):  
Failure Mechanism ◽  
Shear Failure ◽  
Near Field ◽  
Blast Hole ◽  
Tensile Failure ◽  
Detonation Waves ◽  
Affecting Factors ◽  
Concrete Damage ◽  
Failure Properties ◽  
The Media

Based on the JHC model of concrete damage evolution, the dynamic stress characteristics and failure mechanism of blast-hole near-field about different air-decked charge structures are studied by numerical simulation. Result shows that the failure mechanism of typical elements changes from compression-shear failure into shear-tensile failure gradually with the increase of their position in indirect initiation of both top-air-decked and bottom-air-decked charges, because of the affecting factors of the freedom and the loading from the hole. If middle-air-decked charges detonate from the top and bottom at the same time, loading and unloading waves in blasting hole are more influential to the damage of bottom elements than the surface freedom, because detonation waves of both top and bottom meet at the middle hole, so it is conducive to the media failure at the bottom hole, the elements of freedom surface have the same failure properties to top-air-decked charge.

scholarly journals Performance evaluation of compacted bentonite buffer material at shear failure

2010 ◽  
Vol 5 (2) ◽  
pp. 207-218
Author(s):  
Takeshi KODAKA ◽  
Yuko TERAMOTO ◽  
Toshio HIRATE ◽  
Yasuhisa MOTOYAMA
Keyword(s):  
Performance Evaluation ◽  
Shear Failure ◽  
Compacted Bentonite ◽  
Bentonite Buffer ◽  
Buffer Material

Interlaminar shear properties of nanostitched/nanoprepreg aramid/phenolic composites by short beam method

2018 ◽  
Vol 53 (21) ◽  
pp. 2941-2957
Author(s):  
Kadir Bilisik ◽  
Gulhan Erdogan ◽  
Erdal Sapanci
Keyword(s):  
Shear Failure ◽  
Fiber Type ◽  
Multiwall Carbon Nanotubes ◽  
Plane Failure ◽  
Short Beam ◽  
Out Of Plane ◽  
Nanotube Composites ◽  
Failure Properties ◽  
Interlaminar Shear ◽  
Multiwall Carbon

The interlaminar shear strengths of nanostitched 3D aramid/phenolic composites were studied. Stitching slightly improved the interlaminar strength of the z-stitching/nanotube composites. In addition, the stitching fiber type influenced the interlaminar strength of the z-stitching/nanotube aramid/phenolic composites. The failures of all structures in the compression and tensile sides were almost negligible. However, all structures had interlaminar shear failure where delamination in z-stitching/nanotube composites was arrested. The introduction of the stitching yarn in the baseline structure improved its out-of-plane failure properties without reducing the in-plane properties. The effects of stitching and multiwall carbon nanotubes on the 3D aramid/phenolic composite were encouraging and the nanostitched para-aramid/phenolic nanocomposite could be considered as damage tolerance material.

A Cellular Solid Criterion for Predicting the Axial-Shear Failure Properties of Bovine Trabecular Bone

1999 ◽  
Vol 121 (4) ◽  
pp. 414-422 ◽  
Author(s):  
C. M. Fenech ◽  
T. M. Keaveny
Keyword(s):  
Trabecular Bone ◽  
Shear Failure ◽  
Shear Loading ◽  
Principal Strain ◽  
Failure Behavior ◽  
Linear Superposition ◽  
Cellular Solid ◽  
Axial Shear ◽  
Failure Properties ◽  
Von Mises

In a long-term effort to develop a complete multi-axial failure criterion for human trabecular bone, the overall goal of this study was to compare the ability of a simple cellular solid mechanistic criterion versus the Tsai–Wu, Principal Strain, and von Mises phenomenological criteria—all normalized to minimize effects of interspecimen heterogeneity of strength—to predict the on-axis axial-shear failure properties of bovine trabecular bone. The Cellular Solid criterion that was developed here assumed that vertical trabeculae failed due to a linear superposition of axial compression/tension and bending stresses, induced by the apparent level axial and shear loading, respectively. Twenty-seven bovine tibial trabecular bone specimens were destructively tested on-axis without end artifacts, loaded either in combined tension-torsion (n = 10), compression-torsion (n = 11), or uniaxially (n = 6). For compression-shear, the mean (± S.D.) percentage errors between measured values and criterion predictions were 7.7 ± 12.6 percent, 19.7 ± 23.2 percent, 22.8 ± 18.9 percent, and 82.4 ± 64.5 percent for the Cellular Solid, Tsai–Wu, Principal Strain, and von Mises criteria, respectively; corresponding mean errors for tension-shear were –5.2 ± 11.8 percent, 14.3 ± 12.5 percent, 6.9 ± 7.6 percent, and 57.7 ± 46.3 percent. Statistical analysis indicated that the Cellular Solid criterion was the best performer for compression-shear, and performed as well as the Principal Strain criterion for tension-shear. These data should substantially improve the ability to predict axial-shear failure of dense trabecular bone. More importantly, the results firmly establish the importance of cellular solid analysis for understanding and predicting the multiaxial failure behavior of trabecular bone.

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