Effect of water absorption on the mechanical properties of hemp fibre reinforced unsaturated polyester composites

2007 ◽  
Vol 67 (7-8) ◽  
pp. 1674-1683 ◽  
Author(s):  
H DHAKAL ◽  
Z ZHANG ◽  
M RICHARDSON
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Unsaturated Polyester ◽  
Hemp Fibre ◽  
Effect Of Water ◽  
Polyester Composites

Analysis of mechanical properties of hemp fibre reinforced unsaturated polyester composites

2012 ◽  
Vol 47 (12) ◽  
pp. 1513-1525 ◽  
Author(s):  
Moyeenuddin A Sawpan ◽  
Kim L Pickering ◽  
Alan Fernyhough
Keyword(s):  
Mechanical Properties ◽  
Unsaturated Polyester ◽  
Hemp Fibre ◽  
Polyester Composites

scholarly journals Effect of Water Absorption on the Mechanical Properties of Pultruded Kenaf Fibre Reinforced Polyester Composites

2011 ◽  
Vol 20 (1) ◽  
pp. 096369351102000 ◽  
Author(s):  
Norlin Nosbi ◽  
Hazizan Md. Akil ◽  
Z.A. Mohd Ishak ◽  
Azhar A. Bakar
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Room Temperature ◽  
Moisture Absorption ◽  
Stress Transfer ◽  
Distilled Water ◽  
Test Results ◽  
Effect Of Water ◽  
Kenaf Fibre ◽  
Polyester Composites

Kenaf fibre reinforced polyester composites (KFRPC) were prepared using pultrusion method with 30:70 matrix to fibre ratio. The effect of water absorption 260 days in distilled water at room temperature on the mechanical properties was evaluated. Test results indicated KFRPC strengths had decreased with increase in percentage of water uptake. The moisture absorption leads the degradation and creating poor stress transfer efficiencies resulting in a reduction of mechanical properties.

scholarly journals Effect of Water Ingress on the Mechanical and Chemical Properties of Polybutylene Terephthalate Reinforced with Glass Fibers

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1261
Author(s):  
Catarina S. P. Borges ◽  
Alireza Akhavan-Safar ◽  
Eduardo A. S. Marques ◽  
Ricardo J. C. Carbas ◽  
Christoph Ueffing ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Water Uptake ◽  
Significant Influence ◽  
Water Immersion ◽  
Water Diffusion ◽  
Polybutylene Terephthalate ◽  
Chemical Changes ◽  
Water Ingress ◽  
Effect Of Water

Short fiber reinforced polymers are widely used in the construction of electronic housings, where they are often exposed to harsh environmental conditions. The main purpose of this work is the in-depth study and characterization of the water uptake behavior of PBT-GF30 (polybutylene terephthalate with 30% of short glass fiber)as well as its consequent effect on the mechanical properties of the material. Further analysis was conducted to determine at which temperature range PBT-GF30 starts experiencing chemical changes. The influence of testing procedures and conditions on the evaluation of these effects was analyzed, also drawing comparisons with previous studies. The water absorption behavior was studied through gravimetric tests at 35, 70, and 130 °C. Fiber-free PBT was also studied at 35 °C for comparison purposes. The effect of water and temperature on the mechanical properties was analyzed through bulk tensile tests. The material was tested for the three temperatures in the as-supplied state (without drying or aging). Afterwards, PBT-GF30 was tested at room temperature following water immersion at the three temperatures. Chemical changes in the material were also analyzed through Fourier-transform infrared spectroscopy (FTIR). It was concluded that the water diffusion behavior is Fickian and that PBT absorbs more water than PBT-GF30 but at a slightly higher rate. However, temperature was found to have a more significant influence on the rate of water diffusion of PBT-GF30 than fiber content did. Temperature has a significant influence on the mechanical properties of the material. Humidity contributes to a slight drop in stiffness and strength, not showing a clear dependence on water uptake. This decrease in mechanical properties occurs due to the relaxation of the polymeric chain promoted by water ingress. Between 80 and 85 °C, after water immersion, the FTIR profile of the material changes, which suggests chemical changes in the PBT. The water absorption was simulated through heat transfer analogy with good results. From the developed numerical simulation, the minimum plate size to maintain the water ingress unidirectional was 30 mm, which was validated experimentally.

scholarly journals The Effect of Water Absorption on Mechanical Properties of Wood Flour/Wheat Husk Polypropylene Hybrid Composites

2012 ◽  
Vol 03 (05) ◽  
pp. 317-325 ◽  
Author(s):  
Pradeep Upadhyaya ◽  
Manoj Garg ◽  
Vijai Kumar ◽  
Ajay K. Nema
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Hybrid Composites ◽  
Wood Flour ◽  
Effect Of Water ◽  
Wheat Husk
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