Modeling of strain rates and temperature effects on the yield behavior of amorphous polymers

2003 ◽  
Vol 110 ◽  
pp. 39-44 ◽  
Author(s):  
J. Richeton ◽  
S. Ahzi ◽  
L. Daridon ◽  
Y. Rémond
Keyword(s):  
Temperature Effects ◽  
Amorphous Polymers ◽  
Strain Rates ◽  
Yield Behavior

Low-Temperature Effects on E-glass/Urethane at High Strain Rates

AIAA Journal ◽  
2004 ◽  
Vol 42 (5) ◽  
pp. 1050-1053 ◽  
Author(s):  
Shunjun Song ◽  
Jack R. Vinson ◽  
Roger M. Crane
Keyword(s):  
Low Temperature ◽  
Temperature Effects ◽  
High Strain ◽  
Strain Rates ◽  
High Strain Rates

Strain rate and temperature effects on elastic properties of polycaprolactone/starch composite

e-Polymers ◽  
2016 ◽  
Vol 16 (3) ◽  
pp. 217-223 ◽  
Author(s):  
Fethma M. Nor ◽  
Ho Yong Lee ◽  
Joong Yeon Lim ◽  
Denni Kurniawan
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Elastic Properties ◽  
Temperature Effects ◽  
Porous Scaffold ◽  
Element Model ◽  
Strain Rates ◽  
Body Temperatures ◽  
Tissue Engineering Scaffolds ◽  
Human Body Temperature

AbstractComposite of polycaprolactone (PCL) and starch is a potential biomaterial for tissue engineering scaffolds. During implantation, its mechanical properties might be compromised considering the various strain rates it is subjected to and that human body temperature is close to polycaprolactone’s melting temperature. This study aims at revealing the effect of strain rate and temperature to the elastic properties of polycaprolactone-starch composite. Tensile test at strain rates of 5, 0.1, and 0.01 mm/min at ambient and body temperatures were performed. It was revealed that strain rate as well as temperature readily have significant effects on the composite’s elastic properties. Such effects have similar trends with that of PCL homopolymer which is used as the composite’s matrix. Further analysis on the consequence of the finding was performed by applying the behavior to a finite element model of a porous scaffold and it was found that the discrepancy in elastic properties throughout the construct is even greater.

A Constitutive Model Research Based on Dislocation Mechanism of 5083 Aluminum Alloy

2017 ◽  
Vol 35 (02) ◽  
pp. 145-152
Author(s):  
N. Gao ◽  
Z. Zhu ◽  
S. Xiao ◽  
Q. Xie
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Model ◽  
Plastic Flow ◽  
Test System ◽  
Dislocation Dynamics ◽  
Strain Rates ◽  
Prediction Ability ◽  
Yield Behavior ◽  
Wide Range ◽  
5083 Aluminum Alloy

ABSTRACTThe study of the mechanical properties of polycrystalline alloy materials under dynamic impact, namely, the prediction of mechanical behavior after yield stress and the establishment of a constitutive model, has attracted much attention in the field of engineering. The stress-strain curves of 5083 aluminum alloy were obtained under strain rates varying from 0.0002 s-1 to 7130 s-1 through uniaxial compression experiments. The equipment used included a CRIMS RPL100 tester, Instron tester, and split Hopkinson test system. In addition, based on dislocation dynamics and the strengthening mechanism of metals, the plastic flow of the 5083 aluminum alloy was systematically analyzed under a wide range of strain rates. It was found that the abnormal yield behavior of the 5083 aluminum alloy under a wide range of strain rates increased, and the experimental phenomenon of hardening rate decreased with an increase in strain rate. This study also revealed that the abnormal yield behavior is caused by the different dislocation mechanisms of two-phase alloy elements under different strain rates. Based on the thermal activation theory and the experimental data, a constitutive model was developed. A comparison showed good agreement between the experimental and model curves. This indicates that this model has good plastic flow stress prediction ability for such types of materials.

Dynamic Mechanical Properties of PMMA/Organoclay Nanocomposite: Experiments and Modeling

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Rodrigue Matadi Boumbimba ◽  
Said Ahzi ◽  
Nadia Bahlouli ◽  
David Ruch ◽  
José Gracio
Keyword(s):  
Mechanical Properties ◽  
Amorphous Polymers ◽  
Dynamic Mechanical Properties ◽  
Unified Model ◽  
Strain Rates ◽  
Transition Temperatures ◽  
Two Phase ◽  
Stiffness Modulus ◽  
Dynamic Mechanical ◽  
Wide Range

Similarly to unfilled polymers, the dynamic mechanical properties of polymer/organoclay nanocomposites are sensitive to frequency and temperature, as well as to clay concentration. Richeton et al. (2005, “A Unified Model for Stiffness Modulus of Amorphous Polymers Across Transition Temperatures and Strain Rates,” Polymer, 46, pp. 8194–8201) has recently proposed a statistical model to describe the storage modulus variation of glassy polymers over a wide range of temperature and frequency. In the present work, we propose to extend this approach for the prediction of the stiffness of polymer composites by using two-phase composite homogenization methods. The phenomenological law developed by Takayanagi et al., 1966, J. Polym. Sci., 15, pp. 263–281 and the classical bounds proposed by Voigt, 1928, Wied. Ann., 33, pp. 573–587 and Reuss and Angew, 1929, Math. Mech., 29, pp. 9–49 models are used to compute the effective instantaneous moduli, which is then implemented in the Richeton model (Richeton et al., 2005, “A Unified Model for Stiffness Modulus of Amorphous Polymers Across Transition Temperatures and Strain Rates,” Polymer, 46, pp. 8194–8201). This adapted formulation has been successfully validated for PMMA/cloisites 20A and 30B nanocomposites. Indeed, good agreement has been obtained between the dynamic mechanical analysis data and the model predictions of poly(methyl-methacrylate)/organoclay nanocomposites.

Temperature Effects and Fast-Moving Screw Dislocations at High Strain Rate Deformations

1998 ◽  
Vol 538 ◽  
Author(s):  
A. Roos ◽  
E.D. Metselaar ◽  
J.TH.M. De Hosson ◽  
H.H.M. Cleveringa ◽  
E. Van Der Giessen
Keyword(s):  
Temperature Rise ◽  
Temperature Effects ◽  
High Strain ◽  
Strain Rates ◽  
Displacement Fields ◽  
Screw Dislocations ◽  
Discrete Dislocation ◽  
Dislocation Plasticity ◽  
Stress And Displacement Fields ◽  
Inclined Planes

AbstractIn this paper, shear deformation at high strain rates is modeled within the framework of discrete dislocation plasticity. The method of discrete dislocation plasticity is extended to incorporate the temperature rise induced by moving dislocations. Also, the stress and displacement fields of a screw dislocation on inclined planes in a periodic structure are developed. The influence on the temperature rise on various micro-mechanical processes is discussed.

A unified model for stiffness modulus of amorphous polymers across transition temperatures and strain rates

Polymer ◽  
2005 ◽  
Vol 46 (19) ◽  
pp. 8194-8201 ◽  
Author(s):  
J. Richeton ◽  
G. Schlatter ◽  
K.S. Vecchio ◽  
Y. Rémond ◽  
S. Ahzi
Keyword(s):  
Amorphous Polymers ◽  
Unified Model ◽  
Strain Rates ◽  
Transition Temperatures ◽  
Stiffness Modulus

scholarly journals Experimentally simulating high-rate behaviour: rate and temperature effects in polycarbonate and PMMA

2014 ◽  
Vol 372 (2015) ◽  
pp. 20130202 ◽  
Author(s):  
M. J. Kendall ◽  
C. R. Siviour
Keyword(s):  
Temperature Effects ◽  
Amorphous Polymers ◽  
High Rate ◽  
Temperature Profiles ◽  
Deformation Response ◽  
Yield Behaviour ◽  
High Rate Loading ◽  
Rate Behaviour ◽  
Low Strain Rate ◽  
High Rate Deformation

This paper presents results from applying a recently developed technique for experimentally simulating the high-rate deformation response of polymers. The technique, which uses low strain rate experiments with temperature profiles to replicate high-rate behaviour, is here applied to two amorphous polymers, polymethylmethacrylate (PMMA) and polycarbonate, thereby complementing previously obtained data from plasticized polyvinyl chloride. The paper presents comparisons of the mechanical data obtained in the simulation, as opposed to those observed under high-rate loading. Discussion of these data, and the temperature profile required to produce them, gives important information about yield and post-yield behaviour in these materials.

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