Comments on: is there a relationship between length of reinforcing fibre and the strength imparted to the composite? http://www.andersoncompositesquadron.org/carbon-composite/is-there-a-relationship-between-length-of-reinforcing-fibre-and-the-strength-imparted-to-the-composite Sun, 11 Jul 2010 12:55:59 -0400 http://wordpress.org/?v=2.8.4 hourly 1 By: Chris http://www.andersoncompositesquadron.org/carbon-composite/is-there-a-relationship-between-length-of-reinforcing-fibre-and-the-strength-imparted-to-the-composite/comment-page-1#comment-715 Chris Sat, 31 Oct 2009 21:42:59 +0000 http://www.andersoncompositesquadron.org/carbon-composite/is-there-a-relationship-between-length-of-reinforcing-fibre-and-the-strength-imparted-to-the-composite#comment-715 There is a relationship between length and strength benefit, but it is not a simple correlation. The aspect ratio is also important as is the relative stiffness of the fibre and the matrix. I am more familiar with fibres in concrete, where the fibres do their work after the matrix (concrete) begins to crack. The strengthening mechanism is related to the cros sectional area of fibre bridging the crack and its embedment in the matrix to either side of the crack. A very short fibre will have little embedment and will pull out, while a longer fibre will be fully embedded and will rupture. In a concrete matrix fibres shorter than 10-15mm would be fairly innefective, as would fibres >60-75mm as they couldn't be placed effectively. A fibre 0.05mm long would have very little effect unless you are working at the microscopic scale, i.e. very small components with very small crack widths.<br><b>References : </b><br> There is a relationship between length and strength benefit, but it is not a simple correlation. The aspect ratio is also important as is the relative stiffness of the fibre and the matrix.

I am more familiar with fibres in concrete, where the fibres do their work after the matrix (concrete) begins to crack. The strengthening mechanism is related to the cros sectional area of fibre bridging the crack and its embedment in the matrix to either side of the crack. A very short fibre will have little embedment and will pull out, while a longer fibre will be fully embedded and will rupture. In a concrete matrix fibres shorter than 10-15mm would be fairly innefective, as would fibres >60-75mm as they couldn’t be placed effectively.

A fibre 0.05mm long would have very little effect unless you are working at the microscopic scale, i.e. very small components with very small crack widths.
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]]> By: Sophie http://www.andersoncompositesquadron.org/carbon-composite/is-there-a-relationship-between-length-of-reinforcing-fibre-and-the-strength-imparted-to-the-composite/comment-page-1#comment-714 Sophie Sat, 31 Oct 2009 21:22:59 +0000 http://www.andersoncompositesquadron.org/carbon-composite/is-there-a-relationship-between-length-of-reinforcing-fibre-and-the-strength-imparted-to-the-composite#comment-714 No it wont<br><b>References : </b><br> No it wont
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