Measuring the Influence of Temperature on the Development of Elastic Anisotropy With Compressive Plastic Flow for Glassy Polycarbonate

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
A. Goel ◽  
Y. Wen ◽  
J. Hein ◽  
M. Negahban ◽  
J. A. Turner
Keyword(s):  
Plastic Deformation ◽  
Glass Transition ◽  
Transverse Direction ◽  
Elastic Anisotropy ◽  
Elastic Response ◽  
Wave Speeds ◽  
Influence Of Temperature ◽  
Influence Of Temperature On ◽  
Ultrasonic Techniques ◽  
Time Of Travel

The development of anisotropy as a result of isothermal plastic deformation below the glass transition temperature is investigated for different deformation temperatures. Initially, isotropic polycarbonate was subjected to different extents of plastic strain in compression and the developed anisotropic wave speeds were measured using time of travel ultrasonic techniques. Longitudinal wave speeds were measured both in the axial and transverse direction of compression for different deformation temperatures. The wave moduli clearly indicated the development of a transversely elastic response as a result of uniaxial compression.

The Influence of Temperature on Toughness of PA6/POE-G-MAH/OMMT Blends

2012 ◽  
Vol 217-219 ◽  
pp. 630-633
Author(s):  
You Wen ◽  
Yu Zhu Xiong ◽  
Jun Xu ◽  
Cai Juan Huang
Keyword(s):  
Plastic Deformation ◽  
Glass Transition ◽  
Transition Temperature ◽  
Impact Strength ◽  
Influence Of Temperature ◽  
C 23 ◽  
Influence Of Temperature On ◽  
State Changes ◽  
Stress Whitening ◽  
The Impact

Composite materials of POE-g-MAH，OMMT and PA6 were prepared by blending technology. Thermodynamic performances of PA6/POE-g-MAH/OMMT were determined in different temperature by SEM, TEM and XRD. The experimental results indicate that the notched impact strength of bends with the same component gradually increases as temperature increases in the range of -37 °C-23°C ,and with POE-g-MAH/OMMT content increasing, the impact strength keeps rising and stress whitening occurs; But at 50°C, higher than the glass transition temperature of PA6/POE-g-MAH/OMMT , plastic deformation begins easily and strongly. Because POE-g-MAH to a certain content, the stress state changes from plane strain to plane stress, make the ability of plastic deformation increasing .The plastic deformation absorbs many impact energy, and make the stress whitening phenomenon.

scholarly journals ACOUSTIC EMISSION UNDER TEMPERATURE TESTS OF MATERIALS

Aviation ◽  
2005 ◽  
Vol 9 (4) ◽  
pp. 24-28 ◽  
Author(s):  
Vitalii Babak ◽  
Sergay Filonenko ◽  
Viktor Kalita
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission ◽  
High Temperatures ◽  
Low Temperatures ◽  
Theoretical Research ◽  
Influence Of Temperature ◽  
Intermediate Area ◽  
Influence Of Temperature On

The theoretical research of the influence of temperature on the parameters of the alteration of acoustic emission signals from plastic deformation is considered. It is shown that increasing temperatures cause an increase in the amplitude of acoustic emission signals in an area of low temperatures and a decrease in an area of high temperatures. At the same time, there is an intermediate area of temperatures in which the amplitude of acoustic emission signals remains constant when temperature is increased. As shown in the article, this fact is connected with the alteration of the process of plastic deformation.

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