Vibrational analysis of glass/ramie fiber reinforced hybrid polymer composite

Abstract

Natural fiber reinforced hybrid polymer composites have gained extensive applications in recent decades owing to their damping, low density, biodegradability, and low‐cost benefits. This research explores the impact of the surface treatment, and the number of ramie fiber layers on the vibrational and mechanical characteristics of a glass/ramie fiber reinforced hybrid polymer composite. The composite is made of outer layer (glass fiber) and inner layer (ramie fiber) at different concentrations (varying between 2, 3, and 4). The ramie was pre‐treated with sodium hydroxide (NaOH) at different weight percentages (1%, 2%, and 5%). The composites have been fabricated using the vacuum bag technique. The composites have been characterized for chemical, mechanical, morphological, and free vibrational analysis. Fourier transform infrared spectroscopy and scanning electron microscope have been used to study the chemical characteristics and morphological study of the composites respectively. The mechanical properties of the composite were evaluated through tensile and flexural testing. The hybrid composite reinforced with two layers of ramie fiber as the core with 2% pre‐treated shows the maximum tensile strength of 120 MPa and flexural modulus of 12,147 MPa. Overall, the hybridization and NaOH pre‐treatment to certain ratio helps in increase in the hybrid composite's mechanical strength compared to the natural fiber composite.

Nonisothermal crystallization behavior and mechanical properties of poly(lactic acid)/ramie fiber biocomposites

“…The addition of RF reduces the elongation at break, which is common in fiber-reinforced polymers. [35] As expected, the tensile strength first decreases and then increases with increasing fiber content (Figure 7B). Compared with neat PLA, the addition of 5 and 10 wt% RF decreases the tensile strength of the composites.…”

Effect of ammonium polyphosphate on fire‐retardant, mechanical, and vibrational analysis of epoxy/glass/ramie hybrid composite

“…The morphology of the ramie fibers after NaOH treatment was briefly explained in the previous work. [ 36 ] Figure 4 depicts that the brittle crack is observed in the matrix because of the epoxy's amorphous nature. During longitudinal tensile load, the sample gets fractured in the warp direction, as found in Figure 4F, showing better adhesion bonding between fiber‐matrix.…”

“…The vacuum bagging technique [ 37 ] was employed to fabricate the hybrid composites with surface‐treated ramie fiber and following stacking sequence, as briefly explained in the previous work. [ 36 ] In this work, all the specimens were made with a 2% NaOH‐treated ramie fabric, and the stacking sequence was glass‐ramie‐ramie‐glass fiber (the total fiber weight percentage of the samples was 50% glass and 50% ramie fiber). But the addition of APP was varied (0, 5, 10, 15, and 20) weight percentage.…”

“…[43] The procedure and calculation are briefly explained in the previous work. [36] 2.4.7 | Vertical and horizontal flammability test…”

“…This study examines the fire retardant, mechanical, and vibration characteristics of optimized epoxy/glass/ramie (EGR) hybrid composite [ 36 ] with varying weight percentages (5, 10, 15, and 20) of halogen‐free APP. Fire retardant and morphology are evaluated through UL‐94 and SEM testing.…”