Today's KNOWLEDGE Share
Why do Long glass fibers impart unique mechanical properties compared to short fibers ?
Like in a rope pulling game, little stress can be transferred on a short fiber, so fiber pull-out will dominate in case of a tensile fracture. A long fiber is like a longer rope with more people pulling on each side. In this case the strength limit of the rope (fiber) can be reached, and fibers will break when testing the compound in tension.
Interfacial strength also works in this analogy. If the pullers have slippery hands, they will fail breaking the rope which will slip out of hand.
This is how/why one can define the concept of fiber "critical length" below which fibers will be pulled out rather than broken in a compound tensile test.
source : Vito leo
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