An analysis of the influence of the accelerator/sulfur ratio in the cure reaction and the uniaxial stress-strain behavior of SBR

2003 ◽  
Vol 91 (4) ◽  
pp. 2601-2609 ◽  
Author(s):  
A. J. Marzocca ◽  
S. Goyanes
Keyword(s):  
Uniaxial Stress ◽  
Stress Strain ◽  
Cure Reaction ◽  
Strain Behavior

Elastomer Behavior IV. Loop Structure of Elastomer Networks

1966 ◽  
Vol 39 (5) ◽  
pp. 1489-1495
Author(s):  
L. C. Case ◽  
R. V. Wargin
Keyword(s):  
Experimental Data ◽  
Crosslink Density ◽  
Strain Curve ◽  
Uniaxial Stress ◽  
Polymer Chains ◽  
Theoretical Treatment ◽  
Loop Structure ◽  
Stress Strain ◽  
Strain Behavior ◽  
Selection Of

Abstract A new theoretical treatment strongly indicates that an elastomer network actually consists of a system of fused, closed, interpenetrating loops of polymer chains. This interpenetrating loop structure restricts the movement of the chains and thereby affects the stress-strain behavior of the elastomer. Methods have been developed to enable the calculation of the number of effective crosslinks caused by loop interpenetrations (virtual crosslinks). The uniaxial stress-strain behavior of an elastomer predicted using our methods can be fitted almost perfectly to published experimental data by proper selection of chain parameters. Previous theoretical treatments gave only a qualitative fit to the experimental data for the stress-strain behavior of elastomers and were not capable of predicting the correct shape of the experimental stress-strain curve. The present treatment gives a nearly perfect fit for both stress as a function of strain at constant crosslink density, and stress as a function of crosslink density at constant strain, and thus represents a vast improvement.

Modeling of stress-strain relation of cement-treated sand under compression

2021 ◽  
Author(s):  
Khawaja Adeel Tariq ◽  
Takeshi Maki
Keyword(s):  
Research Work ◽  
Fixed Ratio ◽  
Uniaxial Stress ◽  
Limestone Powder ◽  
Compressive Behavior ◽  
Stress Strain ◽  
Element Analysis ◽  
Strain Behavior ◽  
Stress Strain Relation ◽  
Uniaxial Compressive Stress

AbstractThis research work has been conducted to model the uniaxial stress-strain compressive behavior of cement-treated sand and its post-peak softening area. The cylindrical specimens were produced by using limestone powder, sand and high early strength cement. The mixtures were made by using different ratios of water to cement with fixed ratio of limestone powder to cement and cement to sand. The stress-strain behavior in post-peak zone of cement-treated is adjusted with introduction of compression softening factor. Uniaxial compressive stress-strain relationships after amending the Japanese Society of Civil Engineers model are proposed. Finite element analysis shows that the suggested model estimates well the compressive behavior of cement-treated sand.

Uniaxial Stress-Strain Model for Concrete Confined by Rectangular Steel Tubes

2010 ◽  
Vol 163-167 ◽  
pp. 1005-1011
Author(s):  
Yue Ling Long ◽  
Jian Cai
Keyword(s):  
Triaxial Compression ◽  
Uniaxial Stress ◽  
Failure Criteria ◽  
Steel Tube ◽  
Test Results ◽  
Stress Strain ◽  
Steel Tubes ◽  
Concrete Core ◽  
Strain Behavior ◽  
The Difference

This paper presents a new model for uniaxial stress-strain relationship of concrete confined by rectangular steel tubes. The difference between concrete confinement effect provided by broad faces and that provided by narrow faces of steel tube is considered in the proposed model. The failure criteria for concrete subjected to triaxial compression is applied to estimate the ultimate strength of concrete core. The parameters of the model are determined based on the test results and the calculation of complete load-stress relationship curves is conducted for axially loaded rectangular CFT specimens using the model proposed in the paper. The concrete core strength and stress-strain behavior of rectangular CFT columns is found to exhibit good agreement with test results.

scholarly journals Effects of CNT Diameter on the Uniaxial Stress-Strain Behavior of CNT/Epoxy Composites

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
N. Yu ◽  
Y. W. Chang
Keyword(s):  
Epoxy Matrix ◽  
Weight Fraction ◽  
Uniaxial Stress ◽  
Epoxy Composites ◽  
Percentage Increase ◽  
Matrix Composites ◽  
Stress Strain ◽  
Strain Behavior ◽  
Young’S Moduli ◽  
Micromechanics Models

The present work studies the effects of the diameter of carbon nanotube (CNT) as well as CNT weight fraction on the uniaxial stress-strain behavior, stiffness, and strength of CNT-reinforced epoxy-matrix composites. The experimental results show that average Young's moduli of 5 wt%-CNT/epoxy composites with a CNT diameterD<20 nm andD=40∼60 nm are 4.56 GPa and 4.36 GPa, and the average tensile strengths are 52.89 MPa and 46.80 MPa, respectively, which corresponds to a percentage increase of 61.1%, 54.1%, 106%, and 82.3%, respectively. Two micromechanics models are employed and the predicted Young's moduli are benchmarked with the experimental data of MWCNT-reinforced epoxy-matrix composites.

On the Measurement of Stress-Strain Curves by Spherical Indentation

2000 ◽  
Vol 649 ◽  
Author(s):  
E. G. Herbert ◽  
G. M. Pharr ◽  
W. C. Oliver ◽  
B. N. Lucas ◽  
J. L. Hay
Keyword(s):  
Aluminum Alloy ◽  
Uniaxial Tension ◽  
Indentation Test ◽  
Uniaxial Stress ◽  
Analytical Models ◽  
Test Material ◽  
Spherical Indentation ◽  
Stress Strain ◽  
Strain Behavior ◽  
Instrumented Indentation Test

AbstractIt has been proposed that with the appropriate models, instrumented indentation test (IIT) data can be reduced to yield the uniaxial stress-strain behavior of the test material. However, very little work has been done to directly compare the results from uniaxial tension and spherical indentation experiments. In this work, indentation and uniaxial tension experiments have been performed on the aluminum alloy 6061-T6. The purpose of these experiments was to specifically explore the accuracy with which the analytical models can be applied to IIT data to predict the uniaxial stress-strain behavior of the aluminum alloy.

Global Stress-Strain Behavior of Perforated Plate

1980 ◽  
Vol 102 (2) ◽  
pp. 255-263 ◽  
Author(s):  
F. P. J. Rimrott ◽  
A. Singh
Keyword(s):  
Plastic Material ◽  
Perforated Plate ◽  
Strain Curve ◽  
Uniaxial Stress ◽  
Elastic Behavior ◽  
Theoretical Interpretation ◽  
Stress Strain ◽  
Strain Behavior ◽  
Perfectly Plastic ◽  
Lower Limits

The present paper establishes and interprets the global uniaxial stress-strain behavior of regularly perforated plate, throughout the elastic, partly plastic, and fully plastic regimes up to fracture, as function of hole size and number. The elastic part of the stress-strain curve is described by means of an effective modulus of elasticity which is obtained by using the strain energy stored in the plate. During the partly plastic range, perforated plate response has been found to be governed essentially by the remaining elastic portion and consequently appears as part of the elastic behavior. Beyond global yield point, the material is nearly perfectly plastic for a large range of strains and upper and lower limits of collapse load are calculated by using upper and lower-bound techniques for a perfectly plastic material. Experiments were conducted and serve as the basis for the theoretical interpretation.

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