Use of X-radiographic Tracers to Measure Fiber Orientation in Short Fiber Composites

2008 ◽  
pp. 23-23-13 ◽  
Author(s):  
DL Denton ◽  
SH Munson-McGee
Keyword(s):  
Fiber Orientation ◽  
Fiber Composites ◽  
Short Fiber

Fast Solutions for the Fiber Orientation of Concentrated Suspensions of Short-Fiber Composites Using the Exact Closure Method

2010 ◽  
Author(s):  
Stephen Montgomery-Smith ◽  
David A. Jack ◽  
Douglas Smith
Keyword(s):  
Distribution Function ◽  
Orientation Distribution Function ◽  
Fiber Orientation ◽  
Orientation Distribution ◽  
Equation Of Motion ◽  
Fiber Composites ◽  
Short Fiber ◽  
Second Order ◽  
Orientation Tensor ◽  
Kinetics Of

The kinetics of the fiber orientation during processing of short-fiber composites governs both the processing characteristics and the cured part performance. The flow kinetics of the polymer melt dictates the fiber orientation kinetics, and in turn the underlying fiber orientation dictates the bulk flow characteristics. It is beyond computational comprehension to model the equation of motion of the full fiber orientation probability distribution function. Instead, typical industrial simulations rely on the computationally efficient equation of motion of the second-order orientation tensor (also known as the second-order moment of the orientation distribution function) to model the characteristics of the fiber orientation within a polymer suspension. Unfortunately, typical implementation forms of any order orientation tensor equation of motion requires the next higher, even ordered, orientation tensor, thus necessitating a closure of the higher order expression. The recently developed Fast Exact Closure avoids the classical closure problem by solving a set of related second-order tensor equations of motion, and yields the exact solution for pure Jeffery’s motion as the diffusion goes to zero. Typical closures are obtained through a fitting process, and are often obtained by fitting for orientation states obtained from solutions of the full orientation distribution function, thus tying the closure to the flows from which it was fit. With the recent understandings of the limitations of the Folgar and Tucker (1984) model of fiber interactions during processing, it has become clear the importance of developing a closure that is independent of any choice of fitting data. The Fast Exact Closure presents an alternative in that it is constructed independent of any fitting process. Results demonstrate that when diffusion exists, the solution is not only physical, but solutions for flows experiencing Folgar-Tucker diffusion are shown to exhibit an equal to or greater accuracy than solutions relying on closures developed via a curve fitting approach.

The Use of Tensors to Describe and Predict Fiber Orientation in Short Fiber Composites

1987 ◽  
Vol 31 (8) ◽  
pp. 751-784 ◽  
Author(s):  
Suresh G. Advani ◽  
Charles L. Tucker
Keyword(s):  
Fiber Orientation ◽  
Fiber Composites ◽  
Short Fiber

Effects of hybridization and fiber orientation on flexural properties of hybrid short glass fiber– and short carbon fiber–reinforced vinyl ester composites

2018 ◽  
Vol 26 (5-6) ◽  
pp. 371-379 ◽  
Author(s):  
Muhammad Shafiq Irfan ◽  
Farhan Saeed ◽  
Yasir Qayyum Gill ◽  
Asif Ali Qaiser
Keyword(s):  
Fiber Orientation ◽  
Vinyl Ester ◽  
Hybrid Composites ◽  
Glass Fibers ◽  
Fiber Composites ◽  
Short Fiber ◽  
Flexural Properties ◽  
Fiber Reinforced ◽  
Short Carbon ◽  
Short Glass

Short fiber–reinforced hybrid polymer (SFRHP) composites were prepared using short glass fibers (SGFs) and short carbon fibers (SCFs) as the reinforcements and vinyl ester resin as the matrix. The flexural properties of all-SGF, all-SCF, and SGF-SCF hybrid composites with controlled fiber orientation were found out experimentally and also predicted using rule of hybrid mixtures. Hand layup technique was used for the preparation of the composites. Composites with different patterns of fiber alignment were prepared and their properties were compared with randomly oriented short fiber composites. The results showed that the flexural performance of samples with longitudinal orientation of the fibers was significantly better than randomly oriented samples for all composites. Synergistic effect of hybridization (positive hybridization) with respect to flexural properties of SFRHP composites was obtained by controlling the orientation of the fibers. It was shown that the hybridization of fibers in the short fiber composites can provide economic savings.

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