A mathematical approach for describing the time-dependent Poisson's ratio of viscoelastic ligaments mechanical characteristics of biological tissues

2010 ◽  
Author(s):  
H. Ashrafi ◽  
M. Shariyat
Keyword(s):  
Poisson’S Ratio ◽  
Mechanical Characteristics ◽  
Biological Tissues ◽  
Time Dependent ◽  
Poisson's Ratio ◽  
Mathematical Approach

scholarly journals Experimental Research on the Mechanical Characteristics and the Failure Mechanism of Coal-Rock Composite under Uniaxial Load

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Ke Yang ◽  
Zhen Wei ◽  
Xiaolou Chi ◽  
Yonggang Zhang ◽  
Litong Dou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Elastic Modulus ◽  
Crack Propagation ◽  
Failure Mechanism ◽  
Poisson’S Ratio ◽  
Mechanical Characteristics ◽  
Poisson's Ratio ◽  
Energy Value ◽  
Coal Rock

Due to the influence of the component structure and combination modes, the mechanical characteristics and failure modes of the coal-rock composite show different characteristics from the monomer. In order to explore the effect of different coal-rock ratios on the deformation and the failure law of the combined sample, the RMT rock mechanics test system and acoustic emission real-time monitoring system are adopted to carry out uniaxial compression tests on coal, sandstone, and three kinds of combined samples. The evolution rules of the mechanical parameters of the combined samples, such as the uniaxial compressive strength, elastic modulus, and Poisson’s ratio, are obtained. The expansion and failure deformation characteristics of the combined sample are analyzed. Furthermore, the evolution laws of the fractal and acoustic emission signals are combined to reveal the crack propagation and failure mechanism of the combined samples. The results show that the compressive strength and elastic modulus of the combined sample increase with the decrease of the coal-rock ratios, and Poisson’s ratio decreases with the decrease of the coal-rock ratios. The strain softening weakens at the postpeak stage, which shows an apparent brittle failure. The combined sample of coal and sandstone has different degrees of damages under load. The coal is first damaged with a high degree of breakage, with obvious tensile failure. The acoustic emission energy value presents different stage characteristics with increasing load. Crackling sound occurs in the destroy section before the sample reaches the peak, along with small coal block ejection and the partial destruction. The energy value fluctuates violently, with the appearance of several peaks. At the postpeak stage, the coal samples expand rapidly with a loud crackling sound in the destroy section, and the energy value increases dramatically. The crack propagation induces the damage in the sandstone; when the energy reaches the limit value, the instantaneous release of elastic energy leads to the overall structural instability.

Measurement and Parameter Identification of Time Dependent Poisson's Ratio for Underfill Materials

2014 ◽  
Vol 2014.27 (0) ◽  
pp. 96-97
Author(s):  
Takaya KOBAYASHI ◽  
Yasuko MIHARA ◽  
Toshiaki ENOMOTO ◽  
Toshiyuki SATO ◽  
Yoshiharu KARIYA ◽  
...  
Keyword(s):  
Parameter Identification ◽  
Poisson’S Ratio ◽  
Time Dependent ◽  
Poisson's Ratio

A surface flattening method for characterizing the surface stress, drained Poisson’s ratio and diffusivity of poroelastic gels

Soft Matter ◽  
2021 ◽  
Author(s):  
Zezhou Liu ◽  
Chung-Yuen Hui ◽  
Anand Jagota ◽  
Jian Ping Gong ◽  
Ryuji Kiyama
Keyword(s):  
Surface Stress ◽  
Poisson’S Ratio ◽  
Surface Profile ◽  
Time Dependent ◽  
Poisson's Ratio ◽  
Dependent Manner ◽  
Mold Surface ◽  
Surface Flattening

When a poroelastic gel is released from a patterned mold, surface stress drives deformation and solvent migration in the gel and flattens its surface profile in a time-dependent manner. Specifically,...

scholarly journals On relevance of time-dependent Poisson’s ratio for determination of relaxation function parameters

2019 ◽  
Vol 41 (11) ◽  
Author(s):  
Cyprian Suchocki ◽  
Rafał Molak
Keyword(s):  
Poisson’S Ratio ◽  
Relaxation Function ◽  
Memory Function ◽  
Viscoelastic Model ◽  
Three Dimensional ◽  
Acrylonitrile Butadiene Styrene ◽  
Time Dependent ◽  
Poisson's Ratio ◽  
Viscoelastic Constants

Abstract The current study concerns the determination of material constants of a three-dimensional linear viscoelastic model. It is assumed that the constitutive equation utilizes a Prony series as a memory function. A method for the evaluation of relaxation function parameters is presented which can be used for arbitrary loading histories. The proposed methodology is applied to the identification of the viscoelastic constants of acrylonitrile butadiene styrene (ABS). For that purpose, a number of rheological tests in tension have been performed on ABS standard dogbone specimens. The significance of the time-dependent Poisson’s ratio for the determination of material parameters is investigated. It is found that taking into account the measurements of specimen’s lateral contraction over time has a particularly strong influence on the identified values of parameters responsible for the bulk behavior. Several boundary value problems have been analyzed in order to assess the influence of the material parameter values on the obtained solutions. It is demonstrated that some oversimplifications assumed during the determination of viscoelastic constants can lead to a loss of precision or even wrong results.

scholarly journals Time Dependent Poisson’s Ratio of Polymer Gels in Solvent

1994 ◽  
Vol 26 (2) ◽  
pp. 225-227 ◽  
Author(s):  
Toshikazu Takigawa ◽  
Kenji Urayama ◽  
Toshiro Masuda
Keyword(s):  
Poisson’S Ratio ◽  
Polymer Gels ◽  
Time Dependent ◽  
Poisson's Ratio
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