Three-dimensional constitutive equations for Styrene Butadiene Rubber at high strain rates

2008 ◽  
Vol 40 (1-2) ◽  
pp. 1-16 ◽  
Author(s):  
Michelle S. Hoo Fatt ◽  
Xin Ouyang
Keyword(s):  
Constitutive Equations ◽  
High Strain ◽  
Three Dimensional ◽  
Styrene Butadiene Rubber ◽  
Strain Rates ◽  
Butadiene Rubber ◽  
High Strain Rates ◽  
Styrene Butadiene

Identification of constitutive equations at very high strain rates using shock wave produced by laser

2021 ◽  
pp. 104432
Author(s):  
R. Seddik ◽  
A. Rondepierre ◽  
S. Prabhakaran ◽  
L. Morin ◽  
V. Favier ◽  
...  
Keyword(s):  
Shock Wave ◽  
Constitutive Equations ◽  
High Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Very High

scholarly journals Longitudinal Compressive Property of Three-Dimensional Four-Step Braided Composites after Cyclic Hygrothermal Aging under High Strain Rates

2020 ◽  
Vol 10 (6) ◽  
pp. 2061 ◽  
Author(s):  
Kailong Xu ◽  
Wei Chen ◽  
Lulu Liu ◽  
Gang Luo ◽  
Zhenhua Zhao
Keyword(s):  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Dynamic Stiffness ◽  
Three Dimensional ◽  
Peak Stress ◽  
Strain Rates ◽  
Braided Composites ◽  
High Strain Rates ◽  
Stiffness Modulus ◽  
Hygrothermal Aging

The longitudinal compressive behavior of the three-dimensional four-step braided composites after cyclic hygrothermal aging was investigated using a split Hopkinson pressure bar (SHPB) apparatus under high strain rates (1100~1250 s−1, 1400~1600 s−1, 1700~1850 s−1, respectively). The SEM micrographs were examined to the damage evolution of the composites after cyclic hygrothermal aging. A high-speed camera was employed to capture the progressive damage process for the composites. The results indicate that the saturated moisture absorption of the composites was not reached during the whole 210 cyclic hygrothermal aging days. The composites mainly underwent epoxy hydrolysis and interfaces debonding during continuous cyclic hygrothermal aging time. The peak stress of the composites still behaved as a strain rate effect after different cyclic hygrothermal aging days, but the dynamic stiffness modulus clearly had no specific regularity. In addition, the peak stress and the dynamic stiffness modulus of the composites after 210 cyclic hygrothermal aging days almost decreased by half when subjected to longitudinal compression.

EFFECT OF IONIC LIQUID MODIFIED MWCNT ON THE RHEOLOGICAL AND MICROSTRUCTURAL DEVELOPMENTS IN STYRENE BUTADIENE RUBBER NANOCOMPOSITES

2019 ◽  
Vol 92 (3) ◽  
pp. 531-545
Author(s):  
Jiji Abraham ◽  
Ajesh K. Zachariah ◽  
Runcy Wilson ◽  
Rigoberto Ibarra-Gómez ◽  
Rene Muller ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Large Strain ◽  
Three Dimensional ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Multiwalled Carbon ◽  
Nonlinear Viscoelastic ◽  
Roll Mill ◽  
Styrene Butadiene

ABSTRACT Ionic liquid modified multiwalled carbon nanotube (MWCNT) based styrene–butadiene rubber (SBR) nanocomposites were prepared with the two-roll mill mixing method, and the rheological measurements were used to study the dispersion of MWCNTs on a microscopic scale and its compatibility with the SBR matrix. Viscous liquid-like rheological behavior at low MWCNT loadings and pseudo-solid-like rheological response at high MWCNT loadings were observed, showing the gradual transformation from individual structures of MWCNTs to polymer bridged MWCNT networks. A decrease in the mobility of SBR macromolecular chains by the geometric confinement of three-dimensional networks of MWCNTs further confirms the interdeveloped pseudo-solid behavior of filled composites. Dynamic viscoelasticity data have been compared with the theoretical Carreau–Yasuda equation. Transmission electron microscopy of the samples reveals that MWCNTs are randomly dispersed in the rubber matrix. Finally the nature of the filler association and its role in the nonlinear viscoelastic properties at large strain amplitudes were investigated.

Dynamic Constitutive Equations and Behaviour of Brass at High Strain Rates

1995 ◽  
Vol 209 (4) ◽  
pp. 287-293 ◽  
Author(s):  
L-Y Li ◽  
T C K Molyneaux
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Yield Stress ◽  
Constitutive Equations ◽  
High Strain ◽  
Strain Curve ◽  
Strain Rates ◽  
Stress Strain Curve ◽  
High Strain Rates ◽  
Stress Strain

This paper presents an experimental study of the mechanical properties of brass at high strain rates. The brass tested is the copperzinc alpha-beta and beta two-phase alloy in the cold-worked state. Experiments were conducted using an extended tension split Hopkinson bar apparatus. It is found that, at lower strain rates, the stress-strain curve is smooth, exhibiting no well-defined yield stress, but at higher strain rates the stress-strain curve not only shows a well-defined yield stress but also displays a very pronounced drop in stress at yield. The flow stress is found to increase with increasing strain rate, but the increase is more significant for the yield stress than for the flow stress, showing that the yield stress is more sensitive to the strain rate than the flow stress away from the yield point. Based on the experimental results, empirical strain-rate-dependent constitutive equations are recommended. The suggested constitutive equations provide a reasonable estimate of the strain-rate-sensitive behaviour of materials.

scholarly journals Feasibility Study of SBR-Modified Cementitious Mixtures for Use as 3D Additive Construction Materials

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1321 ◽  
Author(s):  
Kim ◽  
Yeon ◽  
Lee ◽  
Yeon
Keyword(s):  
Three Dimensional ◽  
Construction Materials ◽  
Cementitious Materials ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Test Results ◽  
Fresh Properties ◽  
New Class ◽  
Open Time ◽  
Styrene Butadiene

The primary purpose of this study was to investigate the feasibility of applying polymeric cementitious materials to three-dimensional additive construction (3DAC). Specifically, styrene–butadiene rubber (SBR) latex was employed as an admixture to produce SBR-modified cementitious mixtures, and their fresh properties were experimentally investigated to determine the feasibility of their use in the 3DAC process. The SBR/cement ratio was controlled based on four main materials (i.e., cement, sand, silica fume, and fly ash) in order to determine the optimal fresh properties. The test results revealed that the SBR-modified cementitious mixtures showed excellent flowability, extrudability, buildability, and open time, all of which are required for 3DAC materials. The optimal flow of the SBR-modified cementitious mixtures was 70% ± 1%, which is appropriate for 3DAC applications. According to the experiment results, the SBR-modified cementitious mixtures were sufficiently competitive to serve as a new class of materials for 3D additive construction.

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