The Weibull probabilities analysis on the single kenaf fiber

Jayaraman

et al. 2021

Bioresour. Bioprocess.

Vacuum-assisted resin transfer molding (VARTM), used in manufacturing medium to large-sized composites for transportation industries, requires non-woven mats. While non-woven glass mats used in these applications are optimized for resin impregnation and properties, such optimized mats for natural fibers are not available. In the current research, cattail fibers were extracted from plants (18–30% yield) using alkali retting and non-woven cattail fiber mat was manufactured. The extracted fibers exhibited a normal distribution in diameter (davg. = 32.1 µm); the modulus and strength varied inversely with diameter, and their average values were 19.1 GPa and 172.3 MPa, respectively. The cattail fiber composites were manufactured using non-woven mats, Stypol polyester resin, VARTM pressure (101 kPa) and compression molding pressures (260 and 560 kPa) and tested. Out-of-plane permeability changed with the fiber volume fraction (Vf) of the mats, which was influenced by areal density, thickness, and fiber packing in the mat. The cattail fibers reinforced the Stypol resin significantly. The modulus and the strength increased with consolidation pressures due to the increase in Vf, with maximum values of 7.4 GPa and 48 MPa, respectively, demonstrating the utility of cattail fibers from waste biomass as reinforcements.

Section: Resultssupporting

confidence: 81%

Novel cattail fiber composites: converting waste biomass into reinforcement for composites

Jayaraman

et al. 2021

Bioresour. Bioprocess.

“…= 19.1 ± 9.6). Similar variations in tensile strength and modulus were reported for other bast bers (Li et al 2007;Joffea et al 2003;Ali 2013;Ibrahim et al 2018). The modulus and the strength of cattail bers have been found to change with moisture content with a maximum after conditioning at 75.5% RH for 72 hours during which the bers absorbed ~ 15% moisture (Shadhin 2021).…”

Section: Mechanical Properties Of Cattail Bersupporting

confidence: 63%

Novel Cattail Fiber Composites - Converting Waste Biomass into Reinforcement for Composites

Jayaraman

et al. 2021

Preprint

Vacuum Assisted Resin Transfer Molding (VARTM), used to manufacture medium to large sized composites for transportation industries, require non-woven mats. While non-woven glass mats used in these applications are optimized for resin impregnation and properties, such optimized mats for natural fibers are not available. In the current research, cattail fibers were extracted from plants (18–30% yield) using alkali retting and nonwoven cattail fiber mat was manufactured. The extracted fibers exhibited a normal distribution in diameter (davg. = 32.1 µm) and the modulus and strength decreased with increase in diameter with average values of 19.1 GPa and 172.3 MPa, respectively. The cattail fiber composites were manufactured using non-woven mats, Stypol polyester resin, and VARTM (101 kPa) and compression molding pressures (260 and 560 kPa) and tested. Out-of-plane permeability changed with Vf of mats, which was influenced by areal density, thickness, and fiber packing in the mat. The cattail fibers reinforced the stypol resin significantly. The modulus and the strength increased with consolidation pressures due to increase in fiber volume fraction (Vf), with maximum values of 7.4 GPa and 48 MPa, demonstrating the utility of Cattail fibers from waste biomass as reinforcements.

“…(2014). 62 A high modulus value for hemp (70 GPa) 63 and kenaf (175 GPa) 64 was also obtained for oven dried samples. It is possible that due to heating for such a long time some of the microfibrils (theoretical modulus for 100% microfibrils is 70 GPa) converted into crystallites (theoretical modulus for 100% crystallites is 250 GPa), which is approximately 3.5 times stiffer than the microfibrils.…”

Section: Resultsmentioning

confidence: 62%

Probabilistic model for cattail and canola fibers: effect of environmental conditions, structural parameters, fiber length, and estimators

Mann

Textile Research Journal

2022

Biomass fibers are being widely investigated for industrial applications as an alternative to synthetic fibers using a standard humidity condition. In this study, the mechanical properties of two waste biomass fibers – canola and cattail – have been investigated when subjected to different environmental conditions, fiber length, and type of estimators used during analysis. The effect of different environmental conditions and structural variations were investigated by measuring the tensile properties after exposing them to eight different relative humidity conditions using a fixed fiber length of 25 mm. Further investigation was conducted using fiber lengths of 25, 35 and 45 mm using the most conservative relative humidity condition. The data were analyzed by a Weibull distribution model using four different estimators. The results revealed that Weibull strength ( σavg) and modulus (Eavg) closely followed experimental values for cattail and canola fibers. The different relative humidity conditions and fiber lengths resulted in different Weibull parameters with 11% relative humidity and the mean rank estimator predicted the most conservative tensile strength for both waste biomass fibers. The experimental and characteristic Weibull strength decreased when fiber gauge length increased from 25 to 45 mm. The tensile strength and modulus of both waste biomass fibers at 50% reliability lie within the range of average experimental values. However, these values are reduced to 155 MPa (strength) and 20 GPa (modulus) for cattail fiber at 90% reliability. The survival probability of the tensile strength and modulus were found to be the highest at 75% and 100% relative humidity for cattail and canola fibers, respectively.