A Low Velocity Impact Properties of Hybrid of Pineapple Leaf Fibre and Kenaf Fibre Reinforced Vinyl Ester Composites

2021 ◽  
pp. 131-142
Author(s):  
A. A. Mazlan ◽  
M. T. H. Sultan ◽  
N. Saba ◽  
A. U. M. Shah ◽  
S. N. A. Safri ◽  
...  
Keyword(s):  
Vinyl Ester ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Impact Properties ◽  
Velocity Impact ◽  
Kenaf Fibre

Effect of SiO2 Nanoparticles on the Mechanical and Low Velocity Impact Properties of Epoxy/Glass Composites

2016 ◽  
Vol 838 ◽  
pp. 29-35
Author(s):  
Michał Landowski ◽  
Krystyna Imielińska
Keyword(s):  
Flexural Strength ◽  
Energy Absorption ◽  
Impact Energy ◽  
Epoxy Matrix ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Nanoparticle Suspension ◽  
Impact Properties ◽  
Velocity Impact ◽  
The Impact

Flexural strength and low velocity impact properties were investigated in terms of possibile improvements due to epoxy matrix modification by SiO2 nanoparticles (1%, 2%, 3%, 5%, 7%wt.) in glass/epoxy laminates formed using hand lay-up method. The matrix resin was Hexion L285 (DGEBA) with Nanopox A410 - SiO2 (20 nm) nanoparticle suspension in the base epoxy resin (DGEBA) supplied by Evonic. Modification of epoxy matrix by variable concentrations of nanoSiO2 does not offer significant improvements in the flexural strength σg, Young’s modulus E and interlaminar shear strength for 1% 3% and 5% nanoSiO2 and for 7% a slight drop (up to ca. 15-20%) was found. Low energy (1J) impact resistance of nanocomposites represented by peak load in dynamic impact characteristics was not changed for nanocompoosites compared to the unmodified material. However at higher impact energy (3J) nanoparticles appear to slightly improve the impact energy absorption for 3% and 5%. The absence or minor improvements in the mechanical behaviour of nanocomposites is due to the failure mechanisms associated with hand layup fabrication technique: (i.e. rapid crack propagation across the extensive resin pockets and numerous pores and voids) which dominate the nanoparticle-dependent crack energy absorption mechanisms (microvoids formation and deformation).

Optimization of Low-Velocity Impact Properties of E-Glass/Epoxy Composites Using Plasticizing Modifiers

2012 ◽  
Author(s):  
M. M. Rahman ◽  
N. Jahan ◽  
S. Zainuddin ◽  
M. V. Hosur ◽  
S. Jeelani ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
Energy Absorption ◽  
Epoxy Composites ◽  
Low Velocity Impact ◽  
Resin System ◽  
Low Velocity ◽  
Flexure Strength ◽  
Impact Properties ◽  
Velocity Impact ◽  
Epoxy Resin System

The prime aim of this work is to enhance the energy absorbing capabilities of e-glass/epoxy composite under low velocity impact using plasticizing modifiers. Epoxy terminated polyol at 5–15 phr loading levels as plasticizing modifier was mixed into two-phase SC-15 epoxy resin system by a high speed mechanical stirrer. Modified epoxy resin system was then used to fabricate E-glass/epoxy composites by hot press processing. Low velocity impact test at two different energy levels was carried out to investigate the effectiveness of incorporating plasticizing modifier on impact properties of these composites. In addition, three point bend test was also conducted to examine the effects on flexure properties with plasticizing modifiers. Incorporation of epoxy terminated polyol in E-glass/epoxy laminates proved efficient with a significant improvement of 23% in impact energy absorption capability over control counterpart. On the other hand, flexure strength and modulus has been decreased upon polyol loading whereas failure strain has been increased. The flexible polymer chain of polyol group inserted between epoxy molecules by chemical reaction enhances the ductility of the composites and reduces the number of cross-linking. Hence, energy absorption capability or overall toughness was found to increase with a slight reduction of peak strength and flexure strength and stiffness.

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