Abstract:The mechanical and dynamic mechanical properties, interface adhesion and microstructures of the amino silicone oil emulsion (ASO) modified short ramie fiber reinforced polypropylene composites (RFPCs) with different fiber fractions were investigated. The RFPCs were made through a combined process of extrusion and injection molding. Mechanical property tests of the RFPCs revealed enhancements in tensile and flexural strengths with increase of the fiber fraction due to the high stiffness of the fiber filler and … Show more
“…The results are in line with prior research that found decreased E-factor of various reinforced polymer composites. Incorporating increased wood waste fibers into poly(3-hydroxybutyrate) by Panaitescu et al [ 68 ], graphite flake into acrylonitrile butadiene styrene by Pandey et al [ 69 ], carbon nanotubes into poly(ether ketone) by Chauhan et al [ 70 ], and ramie fiber into polypropylene by He et al [ 71 ] has been shown to decrease the E-factor of the resulting composites. Fig.…”
“…The results are in line with prior research that found decreased E-factor of various reinforced polymer composites. Incorporating increased wood waste fibers into poly(3-hydroxybutyrate) by Panaitescu et al [ 68 ], graphite flake into acrylonitrile butadiene styrene by Pandey et al [ 69 ], carbon nanotubes into poly(ether ketone) by Chauhan et al [ 70 ], and ramie fiber into polypropylene by He et al [ 71 ] has been shown to decrease the E-factor of the resulting composites. Fig.…”
“…An impulse hammer excitation [ 16 ] test is performed on the fabricated samples in accordance with the recommendations outlined in ASTM E756 [ 25 ]. A free vibration test is performed to find the natural frequency and damping factors.…”
Section: Methodsmentioning
confidence: 99%
“…Benazir et al [ 15 ] studied the properties of Cyperus pangorei rottb. The addition of ramie fibers in a composite gives a good vibration damping effect [ 16 ]. At present, the void content of the composites has been successfully studied using a CT scan, which is a non-destructive method [ 17 , 18 , 19 , 20 ].…”
Noise pollution is a major threat to the health and well-being of the entire world; this issue forces researchers to find new sound absorption and insulating material. In this paper, the sound absorption coefficient and vibration damping factor of panels manufactured from Cyperus pangorei rottb and ramie fiber reinforced with epoxy resin are explored. Cyperus pangorei rottb grass fiber and ramie fiber are widely available natural fibers. Cyperus pangorei rottb grass fiber is used in mat manufacturing, whereas ramie is widely used as a fabric. Using both of these fibers, six variant panels using a vacuum resin infusion process (VRIP) were fabricated. The panels were named C, R, CR, RCR-Flat, RCR-Curved, and RCR-Perforated. All the panels were tested for the sound absorption coefficient using an impedance tube with a frequency ranging up to 6300 Hz. Modal analysis was carried out by using the impulse hammer excitation method. A micro X-ray computed tomography (CT) scan was used to study the voids present in the panels. The results were compared among the six variants. The results show that the RCR-curved panel had the highest sound-absorbing coefficient of 0.976 at a frequency range between 4500 Hz to 5000 Hz. These panels also showed better natural frequency and damping factors. The presence of internal voids in these panels enhances sound absorption properties. These panels can be used at higher frequencies.
“…Note that the Cole-Cole plots are commonly used to analyze experimental data and inspect theoretical models. In [39], dynamic properties of a sort of polypropylene composites were investigated based on the Cole-Cole plot analysis. In [40], Cole-Cole plots were used to analyze the viscoelastic and mechanical properties of smart thermoplastic elastomeric materials based on recycled rubber shred.…”
Section: The Response Function and The Complex Dielectric Permittivitymentioning
To describe non-Debye relaxation phenomena observed in dielectric materials, the Cole–Cole (CC) relaxation model in the frequency domain and the Kohlrausch–Williams–Watts (KWW) relaxation model in the time domain were introduced in the physics of dielectrics. In this paper, we propose a new relaxation model with two parameters besides a relaxation time by expressing the relaxation function in the time domain in terms of the Mittag–Leffler functions. The proposed model represents a group of non-Debye relaxation phenomena and shows a transition between the CC and the KWW models. The relaxation properties described by the new model are analyzed, including the response function, the normalized complex dielectric permittivity, dielectric storage and loss factors as well as the relaxation frequency and time spectral functions. The presented relaxation function has a concise form and is expected to be applied to more complex relaxation phenomena.
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