This study is about microstructure characterization and understanding the flexural properties of plain-woven sisal fabric reinforced epoxy composites. Vibrational Spectroscopy (FTIR) and SEM (Scanning Electron Microscopy) were used to describe the plain-woven sisal fabric and sisal fiber reinforced epoxy composites. Two laying angles were incorporated into the epoxy resin (10 percent), i.e. [0°/90°] and [0°/45°]. To isolate the effect of epoxy type and whether woven sisal fibers were used, an analytical design that is based on [0°/90°] and [0°/45°] orientation used the results. Epoxy treated with woven sisal fibers had a higher tensile (0.62 GPa) and flexural modulus (0.69 GPa) with tensile (17 MPa) and flexural strength (14 MPa) while being applied to a surface that is sloped at 0°/45° and which generates a displacement force of approximately 12 mm and strain 15.8 %. While conventional Weibull failure theory has long been widely used to explain the failure of brittle bulk materials, this new equation integrates that theory with the lay angle effect on flexural strength in plain sisal to calculate flexural strength reinforcement in epoxy. This new method can be applied to any fiber reinforcement, regardless of the type, and in terms of the failure of that reinforcement, which is governed by linear elastic fracture mechanics, and agreement between experimental data sets is excellent. According to our expectations, this theoretical study is going to provide a new method for the advanced strain engineering system to be built using reinforced fibers.

Zinc oxide (ZnO) and Poly vinyl alcohol capped zinc oxide (PVA-ZnO) of different concentrations were synthesized by precipitation method. PVA capped ZnO nanoparticles were examined to study the influence of ZnO nanoparticles on PVA as it possesses various properties such as mechanical, structural and optical. The synthesized nanoparticles were analyzed using XRD, FTIR, UV-Vis, SEM EDAX techniques. In the FTIR spectrum, the peak observed at 559 cm−1 indicates M–O stretching in the samples which specifies the interaction of ZnO with PVA matrix. The XRD patterns confirmed the presence of ZnO nanoparticles and the size of the ZnO nanoparticles and PVA- ZnO NPs were 76 nm and 61 nm. The uniform dispersion of ZnO nanoparticles as well as the interaction of nanoparticles with the PVA matrix were also observed in SEM analysis and the purity of NPs was determined from EDS analysis. The UV-vis spectra show the light absorption behavior of the ZnO NPs and ZnO-PVA nanocomposites and they exhibited high absorption in the UV region. The mechanical properties such as tensile strength and elongation were also analyzed for the synthesized samples.