Kinetic model for tensile deformation of polymers. 3. Effects of deformation rate and temperature

1988 ◽  
Vol 21 (12) ◽  
pp. 3485-3489 ◽  
Author(s):  
Yves Termonia ◽  
Steven R. Allen ◽  
Paul Smith
Keyword(s):  
Kinetic Model ◽  
Deformation Rate ◽  
Tensile Deformation

scholarly journals Effect of Stretching Rate on Tensile Response and Crystallization Behavior of Crosslinked Natural Rubber

2021 ◽  
Vol 17 (3) ◽  
pp. 217-225
Author(s):  
Abdulhakim Masa ◽  
Nabil Hayeemasae ◽  
Siriwat Soontaranon ◽  
Mohd Hanif Mohd Pisal ◽  
Mohamad Syahmie Mohamad Rasidi
Keyword(s):  
Stress Response ◽  
Natural Rubber ◽  
Deformation Rate ◽  
Crystallization Behavior ◽  
Tensile Deformation ◽  
Chain Orientation ◽  
Tensile Response ◽  
Lower Strain ◽  
Strain Induced Crystallization ◽  
Induced Crystallization

The performance of natural rubber (NR) relies heavily on the microstructural changes during deformation. This has brought to significant change in the stress response of NR. Besides, the stretching rate may also affect the stress response of NR. In this study, effects of stretching rate on tensile deformation and strain-induced crystallization of crosslinked NR were investigated. Results indicated that increasing the strain rate has increased the stress at given strain where the onset of strain-induced crystallization was shifted to a lower strain. The crystallinity of the crosslinked NR was shown to be higher at a high stretching rate and it corresponded well with the tensile response. The results clearly confirm that chain orientation and crystallization became stronger with increasing deformation rate. The study also suggests that the deformation could improve distribution of crosslinked network structures.

Electrically-Assisted Forming of Magnesium AZ31: Effect of Current Magnitude and Deformation Rate on Forgeability

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Joshua J. Jones ◽  
Laine Mears ◽  
John T. Roth
Keyword(s):  
Current Density ◽  
Deformation Rate ◽  
Potential Benefit ◽  
Tensile Deformation ◽  
Threshold Current ◽  
Threshold Current Density ◽  
Compressive Behavior ◽  
Electrically Assisted ◽  
Magnesium Az31 ◽  
First Time

Currently, the automotive and aircraft industries are considering increasing the use of magnesium within their products due to its favorable strength-to-weight characteristics. However, the implementation of this material is limited as a result of its formability. Partially addressing this issue, previous research has shown that electrically-assisted forming (EAF) improves the tensile formability of magnesium sheet metal. While these results are highly beneficial toward fabricating the skin of the vehicle, a technique for allowing the use of magnesium alloys in the production of the structural/mechanical components is also desirable. Given the influence that EAF has already exhibited on tensile deformation, the research herein focuses on incorporating this technique within compressive operations. The potential benefit of using EAF on compressive processes has been demonstrated in related research where other materials, such as titanium and aluminum, have shown improved compressive behavior. Therefore, this research endeavors to amalgamate these findings to Mg AZ31B-O, which is traditionally hard to forge. As such, to demonstrate the effects of EAF on this alloy, two series of tests were performed. First, the sensitivity of the alloy to the EAF process was determined by varying the current density and platen speed during an upsetting process (flat dies). Then, the ability to utilize impression (shaped) dies was examined. Through this study, it was shown for the first time that the EAF process increases the forgeability of this magnesium alloy through improvements such as decreased machine force requirements and increased achievable deformation. Additionally, the ability to form the desired final specimen geometry was achieved. Furthermore, this work also showed that this alloy is sensitive to any deformation rate changes when utilizing the EAF process. Last, a threshold current density was noted for this material where significant forgeability improvements could be realized once exceeded.

Effect of tensile deformation rate on texture formation during subsequent rolling and recrystallization of electric steel

2012 ◽  
Vol 113 (11) ◽  
pp. 1024-1028 ◽  
Author(s):  
V. V. Gubernatorov ◽  
V. D. Solovei ◽  
I. V. Gevras’eva ◽  
T. S. Sycheva ◽  
D. I. Vychuzhanin
Keyword(s):  
Deformation Rate ◽  
Tensile Deformation ◽  
Texture Formation ◽  
Electric Steel

Kinetic model for tensile deformation of polymers

1987 ◽  
Vol 20 (4) ◽  
pp. 835-838 ◽  
Author(s):  
Yves Termonia ◽  
Paul Smith
Keyword(s):  
Kinetic Model ◽  
Tensile Deformation

Kinetic model for tensile deformation of polymers. 2. Effect of entanglement spacing

1988 ◽  
Vol 21 (7) ◽  
pp. 2184-2189 ◽  
Author(s):  
Yves Termonia ◽  
Paul Smith
Keyword(s):  
Kinetic Model ◽  
Tensile Deformation

TEM examination of 2014-SiC metal matrix composite

1988 ◽  
Vol 46 ◽  
pp. 726-727
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
P. K. Liaw
Keyword(s):  
Metal Matrix Composite ◽  
Metal Matrix Composites ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Tensile Deformation ◽  
Microstructural Characterization ◽  
Thin Foil ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Ion Milling

Aluminum-based metal matrix composites offer unique combinations of high specific strength and high stiffness. The improvement in strength and stiffness is related to the particulate reinforcement and the particular matrix alloy chosen. In this way, the metal matrix composite can be tailored for specific materials applications. The microstructural characterization of metal matrix composites is thus important in the development of these materials. In this study, the structure of a p/m 2014-SiC particulate metal matrix composite has been examined after extrusion and tensile deformation.Thin-foil specimens of the 2014-20 vol.% SiCp metal matrix composite were prepared by dimpling to approximately 35 μm prior to ion-milling using a Gatan Dual Ion Mill equipped with a cold stage. These samples were then examined in a Philips 400T TEM/STEM operated at 120 kV. Two material conditions were evaluated: after extrusion (80:1); and after tensile deformation at 250°C.

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