NMR Imaging: Application to Elastomeric Materials

1991 ◽  
pp. 363-375 ◽  
Author(s):  
C. Chang ◽  
R. A. Komoroski
Keyword(s):  
Nmr Imaging ◽  
Imaging Application ◽  
Elastomeric Materials

NMR Imaging of Elastomers and Porous Media

1990 ◽  
Vol 217 ◽  
Author(s):  
Richard A. Komoroski ◽  
Subhendra N. Sarkar
Keyword(s):  
Pore Size ◽  
Spin Echo ◽  
Average Pore Size ◽  
Styrene Butadiene Rubber ◽  
Nmr Imaging ◽  
Butadiene Rubber ◽  
Average Pore ◽  
Rubber Layer ◽  
Rubber Blends ◽  
Elastomeric Materials

ABSTRACTNMR imaging has been applied to some elastomeric materials of industrial interest. The T2s of common elastomers, Particularly after filling and curing, are sufficiently short That spin-echo sequences at submillisecond echo times cannot Produce T2 independent images. The sensitivity to T2 Potentially makes spin echo imaging a good probe of elastomer Blend composition, as demonstrated for a series of filled and Cured cis-polybutadiene, styrene-butadiene rubber blends. The Technique can be used to distinguish good and bad carbon black Dispersion in actual tire tread samples. The configuration of Polyester tire cord, voids, rubber layer boundaries, differences of molecular mobility and composition, and other inhomogeneities can be detected in end-product tire samples. The value of isotropic voxels at 80–100 um and the effect of resolution Relative to pore size are demonstrated on a model, H2O-saturated Porous glass disk of 200-um average pore size. The feasibility of multinuclear NMR imaging for fluid-specific characterization of porous materials such as oil cores is demonstrated for 7Li and 19F

Quadrature Multiplexed RF Excitation in NMR Imaging - Application to Slice by Slice and Chunk 3-D Techniques

1986 ◽  
Vol 33 (1) ◽  
pp. 575-578
Author(s):  
J. B. Ra ◽  
S. K. Hilal ◽  
C. H. Oh ◽  
H. W. Park ◽  
M. H. Cho ◽  
...  
Keyword(s):  
Nmr Imaging ◽  
Imaging Application ◽  
Rf Excitation

NMR imaging of elastomeric materials

1989 ◽  
Vol 22 (2) ◽  
pp. 600-607 ◽  
Author(s):  
C. Chang ◽  
R. A. Komoroski
Keyword(s):  
Nmr Imaging ◽  
Elastomeric Materials

Fatigue Investigation of Elastomeric Structures

2010 ◽  
Vol 38 (3) ◽  
pp. 194-212 ◽  
Author(s):  
Bastian Näser ◽  
Michael Kaliske ◽  
Will V. Mars
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Material Behavior ◽  
Period Effect ◽  
Numerical Representation ◽  
Material Force ◽  
Strain Behavior ◽  
Dissipative Effects ◽  
Elastomeric Materials

Abstract Fatigue crack growth can occur in elastomeric structures whenever cyclic loading is applied. In order to design robust products, sensitivity to fatigue crack growth must be investigated and minimized. The task has two basic components: (1) to define the material behavior through measurements showing how the crack growth rate depends on conditions that drive the crack, and (2) to compute the conditions experienced by the crack. Important features relevant to the analysis of structures include time-dependent aspects of rubber’s stress-strain behavior (as recently demonstrated via the dwell period effect observed by Harbour et al.), and strain induced crystallization. For the numerical representation, classical fracture mechanical concepts are reviewed and the novel material force approach is introduced. With the material force approach at hand, even dissipative effects of elastomeric materials can be investigated. These complex properties of fatigue crack behavior are illustrated in the context of tire durability simulations as an important field of application.

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