Brazilian tensile strength test of lightly cemented sand

1995 ◽  
Vol 32 (1) ◽  
pp. 166-171 ◽  
Author(s):  
B.M. Das ◽  
S.C. Yen ◽  
R.N. Dass
Keyword(s):  
Tensile Strength ◽  
Image Analysis ◽  
Tensile Stress ◽  
Tensile Strain ◽  
Optical Image ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Brazilian Tensile Strength ◽  
Cemented Sand ◽  
Strength Tests

Tensile stress – tensile strain relationships for lightly cemented sand specimens obtained by conducting Brazilian tensile strength tests have been presented. The tensile strain measurement was done by using an optical image analysis technique. In addition to the tensile strength tests, some unconfined compression tests on sand specimens with varying cement contents were also performed. Based on the results of the above tests, a nondimensional tensile stress – tensile strain relationship has been presented. Also the variation of the tensile and compressive strength and strain ratios with varying cement contents have been discussed. Key words : lightly cemented sand, optical image analysis, tensile strain, tensile strength, unconfined compression strength.

Residual Stress Distribution in Pure Bending Beam Subjected to Tensile Failure on One Side

2006 ◽  
Vol 524-525 ◽  
pp. 253-258
Author(s):  
X.B. Wang
Keyword(s):  
Residual Stress ◽  
Tensile Strength ◽  
Stress Distribution ◽  
Tensile Stress ◽  
Strain Localization ◽  
Tensile Strain ◽  
Residual Stress Distribution ◽  
Neutral Axis ◽  
Residual Tensile Stress ◽  
Pure Bending

The stress distribution on the midsection of a pure bending beam where tensile strain localization band initiates on the tensile side of the beam and propagates within the beam is analyzed. Using the static equilibrium condition on the section of the midspan of the beam and the assumption of plane section as well as the linear softening constitutive relation beyond the tensile strength, the expressions for the length of tensile strain localization band and the distance from the tip of the band to the neutral axis are derived. After superimposing a linear unloading stress distribution over the initial stress distribution, the residual stress distribution on the midsection of the beam is investigated. In the process of strain localization band’s propagation, strain-softening behavior of the band occurs and neutral axis will shift. When the unloading moment is lower, the length of tensile strain localization band remains a constant since the stress on the base side of the beam is tensile stress. While, for larger unloading moment, with an increase of unloading moment, the length of tensile strain localization band decreases and the distance from the initial neutral axis to the unloading neutral axis increases. The neutral axis of midsection of the beam will shift in the unloading process. The present analysis is applicable to some metal materials and many quasi-brittle geomaterials (rocks and concrete, etc) in which tensile strength is lower than compressive strength. The present investigation is limited to the case of no real crack. Moreover, the present investigation is limited to the case that the length of strain localization band before unloading is less than half of depth of the beam. Otherwise, the residual tensile stress above the elastic neutral axis will be greater than the tensile strength, leading to the further development of tensile strain localization band in the unloading process.

The Asymmetry of Transient Response in Compression Versus Release for Cartilage in Unconfined Compression

2001 ◽  
Vol 123 (5) ◽  
pp. 519-522 ◽  
Author(s):  
L. P. Li ◽  
M. D. Buschmann ◽  
A. Shirazi-Adl
Keyword(s):  
Articular Cartilage ◽  
Large Deformation ◽  
Transient Response ◽  
Tensile Strain ◽  
Hydraulic Permeability ◽  
Compression Tests ◽  
Unconfined Compression ◽  
The Asymmetry

Observations in compression tests of articular cartilage have revealed unequal load increments for compression and release of the same amplitude applied to a disk with an identical previously imposed compression (in equilibrium). The mechanism of this asymmetric transient response is investigated here using a nonlinear fibril-reinforced model. It is found that the asymmetry is predominantly produced by the fibril stiffening with its tensile strain. In addition, allowing the hydraulic permeability to decrease significantly with compressive dilatation of cartilage increases the transient fibril strain, resulting in a stronger asymmetry. Large deformation also enhances the asymmetry as a consequence of stronger fibril stiffening.

scholarly journals Details about unconfined compression tests and diametral compression tests for tensile strength determination

Geotecnia ◽  
2016 ◽  
Vol 136 ◽  
pp. 127-142
Author(s):  
Saul Barbosa Guedes ◽  
◽  
<br>Roberto Quental Coutinho ◽  
<br>António Viana da Fonseca ◽  
◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Diametral Compression ◽  
Strength Determination

Tensile Strength of Perfect Cubic Crystals under Superimposed Transverse Plain Stress

2007 ◽  
Vol 567-568 ◽  
pp. 73-76 ◽  
Author(s):  
Miroslav Černý ◽  
Jaroslav Pokluda
Keyword(s):  
Tensile Strength ◽  
Tensile Stress ◽  
First Principles ◽  
Tensile Strain ◽  
Limited Range ◽  
Biaxial Stress ◽  
Strain Response ◽  
Cubic Crystals ◽  
Cubic Metals ◽  
Loading Axis

Influence of biaxial stress applied perpendicularly to the [100] loading axis on the tensile stress-strain response is studied from first principles. Crystals of four cubic metals Mo, W, Ir and Au were selected as particular case studies. The results obtained show that, within a limited range of biaxial stresses, the tensile stress increases almost linearly with increasing transverse biaxial stress. The factor that expresses the slope of the linear function changes with applied tensile strain. A region of tensile stability of cubic crystals is also discussed.

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