The Influence of State of Stress on the Stress-Strain Behavior of Rocks

1972 ◽  
Vol 94 (1) ◽  
pp. 238-242 ◽  
Author(s):  
S. R. Swanson ◽  
W. S. Brown
Keyword(s):  
Experimental Investigation ◽  
Strain Response ◽  
Volume Changes ◽  
Stress Strain ◽  
Strain Behavior ◽  
Permanent Set ◽  
State Of Stress

An experimental investigation of the stress-strain behavior of several rocks is described. The stress-strain response of the rocks tested is seen to be quite complicated, exhibiting a number of inelastic effects even in rocks considered brittle under pressure. The inelasticity is manifested in permanent set and hysteresis on unloading and volume changes produced by shearing stresses.

Mechanical Properties of Kevlar® KM2 Single Fiber

2005 ◽  
Vol 127 (2) ◽  
pp. 197-203 ◽  
Author(s):  
Ming Cheng ◽  
Weinong Chen ◽  
Tusit Weerasooriya
Keyword(s):  
Isotropic Material ◽  
Axial Stress ◽  
Axial Loading ◽  
Strain Range ◽  
Transversely Isotropic ◽  
Axial Direction ◽  
Strain Response ◽  
Transversely Isotropic Material ◽  
Stress Strain ◽  
Strain Behavior

Kevlar® KM2 fiber is a transversely isotropic material. Its tensile stress-strain response in the axial direction is linear and elastic until failure. However, the overall deformation in the transverse directions is nonlinear and nonelastic, although it can be treated linearly and elastically in infinitesimal strain range. For a linear, elastic, and transversely isotropic material, five material constants are needed to describe its stress-strain response. In this paper, stress-strain behavior obtained from experiments on a single Kevlar KM2 fiber are presented and discussed. The effects of loading rate and the influence of axial loading on transverse and transverse loading on axial stress-strain responses are also discussed.

A numerical solution of cavity expansion problem in sand based directly on experimental stress-strain curves

1998 ◽  
Vol 35 (4) ◽  
pp. 541-559 ◽  
Author(s):  
Branko Ladanyi ◽  
Adolfo Foriero
Keyword(s):  
Numerical Solution ◽  
Strain Path ◽  
Shear Resistance ◽  
Cavity Expansion ◽  
Large Strains ◽  
Volume Changes ◽  
Stress Strain ◽  
Stress Variation ◽  
Cylindrical Cavity Expansion ◽  
State Of Stress

A numerical solution of a spherical and cylindrical cavity expansion problem in sand is presented herein. The underlying theory is unbiased in that it is based directly on experimentally determined stress-strain curves. The solution makes it possible to follow the continuous variation of strains, stresses, and volume changes produced by cavity expansion. It essentially uses the "strain path" approach to determine the state of stress around the cavity, taking into account large strains and the effect of spherical stress variation on the mobilized shear resistance and the associated volume strains. A limited comparison with experimental data shows a reasonable agreement between theory and measurements.Key words: cavities, expansion, sand, stress-strain curves, numerical solution.

Investigation of Stress-Strain Behavior of a Component Under Variable Frequency Non-Proportional Loading

2018 ◽  
Author(s):  
Yifeng Hu ◽  
Gang Chen ◽  
Weizhe Wang
Keyword(s):  
Stress Response ◽  
Cyclic Softening ◽  
Tension Stress ◽  
Loading Frequency ◽  
Strain Response ◽  
Stress Strain ◽  
Cycle Number ◽  
Strain Behavior ◽  
Load Change ◽  
Significant Difference

With the flexibility operation demand of the plants, the load change becomes more and more often. The torsion loading due to load change becomes larger and more frequent. The influence of torsion loading frequency (the number of repeating cycles in a unit time) on the stress-strain behavior of component was numerically investigated under non-proportional loadings. A hollow cylinder specimen was chosen in this study. And three conditions of non-proportional loadings (Case1, Case2 and Case3) were chosen. The relationships between cyclic stress response and cyclic strain response were obtained for Case1, Case2 and Case3. The numerical results revealed that the distortion of stress-strain response curve was intensified with the increase of torsion loading frequency. The cyclic softening behaved in the first 2 cycles for the tension and torsion stress responses; however, the characterizations of the cyclic hardening and the cyclic softening for the material appeared after the starting 2 cycles. Furthermore, with the increase of cycle number and torsion loading frequency, there is a significant difference between the tension stress response and the torsion stress response.

scholarly journals The influence of grouting and reinforcement ratio in the concrete block masonry compressive behavior

2015 ◽  
Vol 8 (3) ◽  
pp. 341-364 ◽  
Author(s):  
J. S. CAMACHO ◽  
B. G. LOGULLO ◽  
G. A. PARSEKIAN ◽  
P. R. N. SOUDAIS
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Concrete Block ◽  
Reinforcement Ratio ◽  
Compressive Behavior ◽  
Stress Strain ◽  
Strain Behavior

This paper presents an experimental investigation on the compressive strength and stress-strain curves of concrete block masonry with varying block and grout strengths and reinforcement ratio. The three-block prisms, built with 8.5 and 15.0 MPa blocks, were tested hollow and filled with 17.0 and 30.0 MPa compressive strength grouts. In addition, prisms and walls with reinforcement rates of 0.15%, 0.40% and 1.0 % were also tested. With the results, it was possible to measure the compressive strength and stress-strain behavior of masonry with inclusion of different grout and reinforcement components, giving parameters for better evaluation of their performance and design. Among the conclusions, it was observed that increasing the compressive strength of masonry is not proportional to the increase of the grouting area and the efficiency of reinforcement to increase compressive strength is low. Stress-strain curves for the several materials combinations are made available.

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