Stress-strain behavior of segmented polyurethaneureas under pure shear deformation

1996 ◽  
Vol 35 (3) ◽  
pp. 288-295 ◽  
Author(s):  
Toshikazu Takigawa ◽  
Satoshi Yamasaki ◽  
Kenji Urayama ◽  
Masaoki Takahashi ◽  
Toshiro Masuda
Keyword(s):  
Shear Deformation ◽  
Pure Shear ◽  
Stress Strain ◽  
Strain Behavior

612 Effects of Strain Rates on Stress-Strain Behavior of Adhesive Layer under Pure Shear Stress Conditions

2000 ◽  
Vol 2000.8 (0) ◽  
pp. 203-204
Author(s):  
Akinori FUJINAMI ◽  
Katsuhiko OSAKA ◽  
Takao WADA ◽  
Takehito FUKUDA ◽  
Makoto IMANAKA
Keyword(s):  
Shear Stress ◽  
Pure Shear ◽  
Adhesive Layer ◽  
Stress Conditions ◽  
Strain Rates ◽  
Stress Strain ◽  
Strain Behavior

New Model for Hyper-Elastic Materials Behavior With an Application on Natural Rubber

2017 ◽  
Author(s):  
Ahmed G. Korba ◽  
Mark E. Barkey
Keyword(s):  
Natural Rubber ◽  
Test Data ◽  
Pure Shear ◽  
Testing Machine ◽  
Shear Loading ◽  
Least Square ◽  
Elastic Materials ◽  
Stress Strain ◽  
Strain Behavior ◽  
Hyper Elastic

This paper is concerned with defining a new Weight Function Based model (WFB), which describes the hyper-elastic materials stress-strain behavior. Numerous hyper-elastic theoretical material models have been proposed over the past 60 years capturing the stress-strain behavior of large deformation incompressible isotropic materials. The newly proposed method has been verified against the historic Treloar’s test data for uni-axial, bi-axial and pure shear loadings of Treloar’s vulcanized rubber material, showing a promising level of confidence compared to the Ogden and the Yeoh methods. A non-linear least square optimization Matlab tool was used to determine the WFB, Yeoh and Ogden models material parameters. A comparison between the results of the three models was performed showing that the newly proposed model is more accurate for uni-axial tension as it has an error value which is less than the Ogden and Yeoh models by 1.0 to 39%. Also, the parameters calculation by more than 95%, for the bi-axial and pure shear loading cases compared to the Ogden model. Natural rubber test specimens have been tensioned using a tensile testing machine and the WFB model was applied to fit the test data results showing a very good curve fitting with an average error of 0.44%.WFB model has reduced processing time for the model.

The KES Shear Test for Fabrics

1997 ◽  
Vol 67 (9) ◽  
pp. 654-664 ◽  
Author(s):  
Jin-Lian Hu ◽  
Yi-Tong Zhang
Keyword(s):  
Shear Stress ◽  
Shear Modulus ◽  
Shear Deformation ◽  
Shear Test ◽  
Pure Shear ◽  
Shear Stresses ◽  
Stress Strain ◽  
Complex Deformation ◽  
Strain Relationship ◽  
Shear Tester

Many fabric mechanics researchers have reported that specimens being tested on the KES shear tester are not subjected to pure shear deformation; therefore, test results cannot lead directly to a determination of the fabric shear modulus and stress/strain relationship, particularly in the nonlinear range of stress-strain. Combined with finite element analysis, this paper presents an analytical solution for the distribution of shear stresses and strains in fabric specimens tested on the kes tester. A fabric is treated as an orthotropic sheet during the analysis, which leads to a closed-form solution for the shear modulus as a function of fabric tensile and shear moduli from the kes shear test. A modified shear stress-strain relationship can also be derived. From calculations for fabrics used here, the difference between modified and tested shear modulus values is about 25–30%. The study also suggests that although the shear modulus and curves obtained on the kes shear tester are significantly different from those under the pure shear state, the kes results can still reflect the nature of a fabric under shear deformation and are valid for general objective evaluations. The exact shear stress-strain relationship and actual shear modulus may be modified only when they are required for fabric complex deformation analysis.

Characterization of the Behavior of Rubber for Engineering Design Purposes. 1. Stress-Strain Relations

1994 ◽  
Vol 67 (4) ◽  
pp. 716-728 ◽  
Author(s):  
C. K. L. Davies ◽  
Dilip K. De ◽  
A. G. Thomas
Keyword(s):  
Engineering Design ◽  
Pure Shear ◽  
Deformation Mode ◽  
Analytical Form ◽  
Stress Strain ◽  
Strain Behavior ◽  
Stress Strain Relation ◽  
Strain Invariant ◽  
Filled Rubbers ◽  
Simple Deformation

Abstract The stress-strain behavior of a range of black-filled rubbers has been studied in extension, compression, pure shear and simple shear. The data have been analyzed to examine the validity of Gregory's hypothesis that the stored energy function U of filled rubbers can be expressed solely in terms of the strain invariant I1, ignoring I2, to an accuracy adequate for most engineering design requirements. Our results confirm his suggestion. An analytical form for U is proposed which gives a very good fit to the experimental data for strains from less than 0.1% to somewhat greater than 100%, which cover the range of interest for most engineering applications. The dependencies of the parameters in the expression for U on filler level and degree of crosslinking have been examined. It has thus been demonstrated that, for a given material, the form of U can be determined from the measured stress-strain relation in any simple deformation mode, shear or tension for example, without the necessity of relatively difficult biaxial measurements, and that this function should then be applicable to any deformation mode, complex or simple.

Contribution to the Mathematical Description of Stress-Strain Behavior of Elastomers

1980 ◽  
Vol 53 (4) ◽  
pp. 836-841 ◽  
Author(s):  
K. Tobisch
Keyword(s):  
Energy Density ◽  
Density Function ◽  
Mathematical Description ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Pure Shear ◽  
Simple Extension ◽  
Stress Strain ◽  
Strain Behavior ◽  
Strain Energy Density Function

Abstract Based on the hypothesis of Valanis and Landel that the strain energy density function W(λx,λy,λz)could be represented as the sum of three identical functions ω(λi) of the principal extension ratios λi(i=x,y,z), an expression for ω(λi) is suggested which is distinguished by its relative simplicity. The stress-strain relations developed from this expression are tested successfully by applying them to experimental results of other authors. The types of strain which were examined were simple extension, biaxial extension and pure shear; the elongations were to about 700%.

Stress Strain Behavior of Steel Fibre Based Concrete in Compression

2012 ◽  
Vol 1 (3) ◽  
pp. 32-38
Author(s):  
Tantary M.A ◽  
◽  
Upadhyay A ◽  
Prasad J ◽  
◽  
...  
Keyword(s):  
Steel Fibre ◽  
Stress Strain ◽  
Strain Behavior

scholarly journals Increase in Total Elongation Caused by Pure Shear Deformation in Ultra-Fine-Grained Cu Processed by Equal-Channel Angular Pressing

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 654
Author(s):  
Ryosuke Matsutani ◽  
Nobuo Nakada ◽  
Susumu Onaka
Keyword(s):  
Shear Deformation ◽  
Equal Channel Angular Pressing ◽  
Pure Shear ◽  
Three Dimensional ◽  
Tensile Tests ◽  
Total Elongation ◽  
Local Deformation ◽  
Image Correlation ◽  
Fine Grained ◽  
Angular Pressing

Ultra-fine-grained (UFG) Cu shows little total elongation in tensile tests because simple shear deformation is concentrated in narrow regions during the initial stage of plastic deformation. Here, we attempted to improve the total elongation of UFG Cu obtained by equal-channel angular pressing. By making shallow dents on the side surfaces of the plate-like specimens, this induced pure shear deformation and increased their total elongation. During the tensile tests, we observed the overall and local deformation of the dented and undented UFG Cu specimens. Using three-dimensional digital image correlation, we found that the dented specimens showed suppression of thickness reduction and delay in fracture by enhancement of pure shear deformation. However, the dented and undented specimens had the same ultimate tensile strength. These results provide us a new concept to increase total elongation of UFG materials.

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