Continuous fibre composite transverse loading

  • Thread starter olski1
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  • #1
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Main Question or Discussion Point

Why is the traverse loading strength of continuous fibre reinforced composites weaker compared to the longitudinal strength?

I sort of arrived at the conclusion, that since the composite is in an isostress state and due to the fibre having a very low tensile strength in the transverse direction. The majority of the mechanical properties relies on the matrix strength, which is usually lower than that of the fibre, thus leading to early on set of failure.

Is it also due to the shear stress created at the fibre ends? also, why do the fibres have a low tensile strength in the transverse direction?

Any help would be greatly appreciated :)
 

Answers and Replies

  • #2
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traverse strength is depend on many factors such as the interface bond strength, the properties of matrik and reinforcement, the presence of voids etc. unlike longitudinal strength, it only depend on single factor ie the fibre strength.
yes i agree with u that, when tensile test is done in tranverse direction, the fiber have a negative effect, the composite is rely on the properties of matrix only.
 
  • #3
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fibre having a very low tensile strength in the transverse direction
Some fibres do, eg graphite, some do not eg steel. So your theory does not hold water.

the composite is rely on the properties of matrix only.
This statement is never true.

traverse strength is depend on many factors
This is true and also applies to the stength in any direction.

Perhaps the most important factors affecting the strength of a fibre composite - apart from the obvious strengths of the components - are the lengths, orientation and lay of the fibres.
 
  • #4
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and how would those lengths, orientations and lay of fibers affect the composite?
 

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