The role of interface and fibre anisotropy in controlling the performance of polyethylene-fibre-reinforced composites

Abstract

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High-performance liquid-crystalline polymer films for monolithic “composites”

“…(3), the experimental shear modulus G 12 of an LCP monolith was found to be $1 GPa, in good agreement with the shear modulus of injection molded LCP material (G 12 = 1.13 GPa) [28]. This value is relatively low compared to the typical values for the axial shear modulus of high-performance fibers such as aramid (Kevlar Ò 49) and high-strength carbon (T300), reported to be 2-3 and 12 GPa, respectively [29][30][31], but is the same as for high-performance polyethylene (PE) fibers (G 12 = 1 GPa for Spectra Ò 900 [29]). The low shear modulus of oriented LCP is reflected in the observed strongly-reduced off-axis stiffness and is indicative of relatively weak inter-chain interactions.…”

Toughness, flexural, damping and interfacial properties of hybridized GFRE composites with MWCNTs

“…In the present work, the off-axis flexural strengths (r h ) were predicted using the Maximum Stress and Tsai-Hill theories as follows [22,23]:…”

“…The off-axis flexural moduli (E h ) of the unidirectional composite laminates were predicted by the following equation [23]:…”

Plasma penetration depth and mechanical properties of atmospheric plasma-treated 3D aramid woven composites

“…Therefore, plasma treatments have been applied to almost all kinds of reinforcing fibers [8]. In general, the mechanical properties of the fiber reinforced composites in which the plasma-treated fibers were used as reinforcements can be improved due to improved adhesion between the fiber and the matrix [9][10][11][12][13][14][15]. Treating composite preforms instead of fibers or yarns can be advantageous because yarns may be stored for long time before being woven into fabrics and then impregnated in a composite.…”