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Moldflow fiber orientation

Edit: ABIS Mold Technology Co.,Ltd    Date: Jul 26, 2017
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The modeling of fiber-reinforced thermoplastics (composites) is more complex than in other applications, since the parts are usually thin and shorter fibers are often used.Other aspects, such as the 3-dimensional orientation of the fibers and the significant orientation variations across the part also contribute to the complexity of the problem.

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Affecting fiber alignment (orientation)

In injection-molded composites, the fiber alignment (or orientation) distributions show a layered nature, and are affected by: 

  • filling speed

  • processing conditions

  • material behavior

  • fiber aspect ratio (ratio of the length of the fiber to the diameter)

  • fiber concentration (weight percentage)


Without proper consideration of the fiber behavior, there is a tendency to significantly overestimate the orientation levels. The results from a fiber orientation analysis can be used as input for a warpage analysis, providing more detailed elemental results, and considerably enhanced analysis accuracy.


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