Segmented Polyurethane Nanocomposites:  Impact of Controlled Particle Size Nanofillers on the Morphological Response to Uniaxial Deformation

2005 ◽  
Vol 38 (17) ◽  
pp. 7386-7396 ◽  
Author(s):  
Bradley Finnigan ◽  
Kevin Jack ◽  
Kayleen Campbell ◽  
Peter Halley ◽  
Rowan Truss ◽  
...  
Keyword(s):  
Particle Size ◽  
Uniaxial Deformation ◽  
Segmented Polyurethane ◽  
Morphological Response ◽  
Polyurethane Nanocomposites

Impact of controlled particle size nanofillers on the mechanical properties of segmented polyurethane nanocomposites

2007 ◽  
Vol 4 (5) ◽  
pp. 496 ◽  
Author(s):  
Bradley Finnigan ◽  
Phil Casey ◽  
David Cookson ◽  
Peter Halley ◽  
Kevin Jack ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Segmented Polyurethane ◽  
Polyurethane Nanocomposites

Effect of the average soft-segment length on the morphology and properties of segmented polyurethane nanocomposites

2006 ◽  
Vol 102 (1) ◽  
pp. 128-139 ◽  
Author(s):  
Bradley Finnigan ◽  
Peter Halley ◽  
Kevin Jack ◽  
Alasdair McDowell ◽  
Rowan Truss ◽  
...  
Keyword(s):  
Soft Segment ◽  
Segment Length ◽  
Segmented Polyurethane ◽  
Polyurethane Nanocomposites

Functionalized graphene sheet/polyurethane nanocomposites: Effect of particle size on physical properties

2011 ◽  
Vol 19 (8) ◽  
pp. 809-814 ◽  
Author(s):  
Jin Taek Choi ◽  
Dong Hoon Kim ◽  
Kwang Sun Ryu ◽  
Hyung-il Lee ◽  
Han Mo Jeong ◽  
...  
Keyword(s):  
Particle Size ◽  
Physical Properties ◽  
Graphene Sheet ◽  
Functionalized Graphene ◽  
Effect Of Particle Size ◽  
Polyurethane Nanocomposites

Non-Einstein Rheology in Segmented Polyurethane Nanocomposites

2021 ◽  
Vol 54 (6) ◽  
pp. 2783-2796
Author(s):  
Hamid Reza Heydarnezhad ◽  
Naser Mohammadi ◽  
Angel Alegria
Keyword(s):  
Segmented Polyurethane ◽  
Polyurethane Nanocomposites

Comparison of Substructures Between Uniaxial and Biaxial Deformation in 1100-0 Aluminum

1981 ◽  
Vol 39 ◽  
pp. 52-53
Author(s):  
D. L. Rohr ◽  
S. S. Hecker
Keyword(s):  
Plastic Strain ◽  
Cell Walls ◽  
Room Temperature ◽  
Mechanical Response ◽  
Biaxial Tension ◽  
Initial Deformation ◽  
Uniaxial Deformation ◽  
Biaxial Deformation ◽  
Stress States ◽  
Comprehensive Study

As part of a comprehensive study of microstructural and mechanical response of metals to uniaxial and biaxial deformations, the development of substructure in 1100 A1 has been studied over a range of plastic strain for two stress states.Specimens of 1100 aluminum annealed at 350 C were tested in uniaxial (UT) and balanced biaxial tension (BBT) at room temperature to different strain levels. The biaxial specimens were produced by the in-plane punch stretching technique. Areas of known strain levels were prepared for TEM by lapping followed by jet electropolishing. All specimens were examined in a JEOL 200B run at 150 and 200 kV within 24 to 36 hours after testing.The development of the substructure with deformation is shown in Fig. 1 for both stress states. Initial deformation produces dislocation tangles, which form cell walls by 10% uniaxial deformation, and start to recover to form subgrains by 25%. The results of several hundred measurements of cell/subgrain sizes by a linear intercept technique are presented in Table I.

Microstructural characterization of laser-melted/roller-quenched dicalcium silicate

1988 ◽  
Vol 46 ◽  
pp. 582-583
Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Shape Change ◽  
Microstructural Characterization ◽  
Particle Size Effect ◽  
Dicalcium Silicate ◽  
Laser Melting ◽  
Uniform Size ◽  
Cell Shape Change ◽  
Wide Range

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.

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