Effect Of Fiber Interval On Tensile Strength Of
Fiber Reinforced Plastics In Multi-fiber
Fragmentation Test
Author(s)
A. Maki, A. Sakuratani, T. Atsuoka & T. Hirayama
Abstract
Plastics reinforced by natural fibers may be more susceptible to damage than
those reinforced by carbon or glass fibers. Composite damage might be affected
by fiber interval and interfacial strength between fiber and matrix resin because
mechanical properties and composite damage relate to the interaction between
fiber and resin. It is quite difficult to evaluate the effect of composite damage for
tensile strength by using actual fiber reinforced plastic. Therefore, multi-fiber
fragmentation specimens were formed by changing the number of fibers, the
fiber interval, and the interfacial strength and then conducting a tensile test to
evaluate the effect of fiber interval and interfacial strength on tensile strength and
composite damage. Before molding the plastic, the fiber surface was modified by
ethylene plasma treatment to improve adherence to the resin. The interfacial
shear strength increased by 63% after 2 min. This is due to improved wettability
between the fiber and polypropylene by the formation of thin film on fiber
surfaces containing function groups such as (CH2)n, CH, C=C, and CO. Tensile
tests on multi-fiber fragmentation specimens showed that the tensile strength
decreased when the fiber intervals were widened because the tensile strength was
affected by composite damage such as interfacial debonding, fiber break, crazing
and whitening of polypropylene. In plasma-treated specimens, whitening as well
as crazing was controlled by improving the interfacial strength between the fiber
and polypropylene with an ethylene plasma treatment, which improved the
tensile strength. This demonstrates that composite damage has a close
relationship with fiber interval and interfacial strength, and that tensile strength
might be increased by controlling them.
Keywords: multi-fiber fragmentation test, fiber interval, plasma treatment.
Keywords
multi-fiber fragmentation test, fiber interval, plasma treatment.
Related Book
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