scholarly journals Effect of fibre treatments on interfacial shear strength of hemp fibre reinforced polylactide and unsaturated polyester composites

2011 ◽  
Vol 42 (9) ◽  
pp. 1189-1196 ◽  
Author(s):  
Moyeenuddin A. Sawpan ◽  
Kim L. Pickering ◽  
Alan Fernyhough
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Unsaturated Polyester ◽  
Interfacial Shear ◽  
Hemp Fibre ◽  
Polyester Composites

scholarly journals Interfacial Debonding Force and Shear Strength of Sugar Palm (Arenga pinnata) Fiber Reinforced Composites by Pull-Out Test

2013 ◽  
Vol 634-638 ◽  
pp. 1931-1936 ◽  
Author(s):  
L.S. Khor ◽  
Leman Zulkiflle ◽  
C. H. Lee
Keyword(s):  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Phenol Formaldehyde ◽  
Unsaturated Polyester ◽  
Interfacial Shear ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Remarkable Improvement ◽  
Pull Out ◽  
Fiber Matrix Interface

An experimental investigation was performed to understand the pulling out behaviour of sugar palm (Arenga pinnata) fibers from unsaturated polyester (UP) composites. The effect of embedded length on the fiber-matrix interface was studied. Fibers were treated with UP and phenol formaldehyde (PF). Untreated fibers were used as the control. Single fiber pull-out tests were carried out for 360 specimens to determine the debonding force and interfacial shear strength (IFSS). Significant increase in debonding force of untreated fiber and UP-impregnated fiber was observed from embedded length of 2 mm to 3 mm. However, no significant increase was observed for the embedded length of more than 3 mm. Debonding force showed remarkable improvement with ascending order of untreated fibers, PF-impregnated fibers, and UP-impregnated fibers. The optimum embedded lengths of untreated fibers and UP fibers were determined. Additional finding showed that the interfacial shear strength decreased as the embedded length increased. However, UP-impregnated fibers showed the highest IFSS value, followed by PF fibers and untreated fibers. Analysis using Scanning Electron Microscope (SEM) was also included to justify the result.

Influence of Alkali Treatment on the Interfacial Bond Strength of Industrial Hemp Fibre Reinforced Epoxy Composites: Effect of Variation from the Ideal Stoicheometric Ratio of Epoxy Resin to Curing Agent

2007 ◽  
Vol 29-30 ◽  
pp. 319-322 ◽  
Author(s):  
M.S. Islam ◽  
K.L. Pickering
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Epoxy Resin ◽  
Young’S Modulus ◽  
Interfacial Shear Strength ◽  
Alkali Treatment ◽  
Interfacial Shear ◽  
Curing Agent ◽  
Hemp Fibre ◽  
Industrial Hemp

Industrial hemp fibre was treated with alkali and the influence of this treatment on interfacial shear strength (assessed using the single fibre pull-out test) and composite strength with an epoxy resin, over a range of epoxy resin to curing agent ratios, was investigated. Scanning electron microscopy was conducted to assess the fracture behaviour of the composite tensile test specimens. It was found that alkali treatment increased the interfacial shear strength and composite tensile strength, Young’s modulus and elongation at break. The highest tensile strength was obtained with an epoxy resin to curing agent ratio of 1:1 while the best Young’s modulus was achieved with a resin to curing agent ratio of 1:1.2.

Interfacial Shear, Tensile Strength and Young Modulus of Kenaf Fiber: The Effects from Different Settings of Alkali Treatment

2018 ◽  
Vol 791 ◽  
pp. 10-18
Author(s):  
Mohd Yussni Hashim ◽  
Azriszul Mohd Amin ◽  
Omar Mohd Faizan Marwah ◽  
Mohd Hilmi Othman ◽  
Muhammad Akmal Johar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Interfacial Shear Strength ◽  
Alkali Treatment ◽  
Unsaturated Polyester ◽  
Young Modulus ◽  
Interfacial Shear ◽  
Alkali Concentration ◽  
Kenaf Fiber ◽  
Treatment Settings

The project explained about what happened to fiber matrix interfacial shear strength, fiber tensile strength and fiber Young modulus when different alkali treatment settings were applied. Kenaf fiber were exposed to different alkali concentration, immersion duration and immersion temperature. To determine the interfacial shear strength (IFSS), unsaturated polyester matrix was utilised to expose the properties. The effects of alkali treatment on sample mechanical properties were successfully evaluated, whereby the treated sample's IFSS showed slightly higher value compared to untreated kenaf fiber at all settings. Meanwhile, the IFSS value was increased at low alkali concentration and decreased with the increment of alkali concentration percentage. On the other hand, untreated kenaf fiber tensile strength and Young modulus average value was 632MPa and 40.65GPa respectively. It was also established that the sample's tensile strength was keep reducing after treatment at all settings. At 30 minutes constant immersion duration, the percentage of kenaf fiber tensile strength decrement was 42.57% when other treatment settings increased. Furthermore, a decline pattern was obtained in term of sample tensile strength and Young modulus when the alkali treatment increased at all settings.

scholarly journals Further Progress in Functional Interlayers with Controlled Mechanical Properties Designed for Glass Fiber/Polyester Composites

Fibers ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 58 ◽  
Author(s):  
Antonin Knob ◽  
Jaroslav Lukes ◽  
Lawrence Drzal ◽  
Vladimir Cech
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Glass Fiber ◽  
Polymer Composites ◽  
Polymer Matrix ◽  
High Performance ◽  
Interfacial Shear Strength ◽  
Interfacial Shear ◽  
High Performance Polymer ◽  
Polyester Composites

Compatible interlayers must be coated on reinforcing fibers to ensure effective stress transfer from the polymer matrix to the fiber in high-performance polymer composites. The mechanical properties of the interlayer, and its interfacial adhesion on both interfaces with the fiber and polymer matrix are among the key parameters that control the performance of polymer composite through the interphase region. Plasma-synthesized interlayers, in the form of variable materials from polymer-like to glass-like films with a Young’s modulus of 10–52 GPa, were deposited on unsized glass fibers used as reinforcements in glass fiber/polyester composites. Modulus Mapping (dynamic nanoindentation testing) was successfully used to examine the mechanical properties across the interphase region on cross-sections of the model composite in order to distinguish the fiber, the interlayer, and the modified and bulk polymer matrix. The interfacial shear strength for plasma-coated fibers in glass fiber/polyester composites, determined from the microindentation test, was up to 36% higher than those of commercially sized fibers. The effects of fiber pretreatment, single and double interlayers, and post-treatment of the interlayer on interfacial shear strength were also discussed. Functional interlayers with high shear yield strength and controlled physicochemical properties are promising for high-performance polymer composites with a controlled interphase.

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