School of Mechanical and Industrial Engineering

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Browsing School of Mechanical and Industrial Engineering by Subject "2X2 Twill Weave"

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    Investigation of Mechanical Characteristics of Woven Glass-Sisal Hybrid Composites
    (Addis Ababa University, 2024-12) Temkin Abdulkader; Mulugeta Habtemariam (PhD)
    Due to their ability to combine the advantages of both natural and synthetic fibers there has been a growing interest in hybrid fiber composites. These materials can improve mechanical properties while maintaining the benefits of natural fiber use. This research investigated the mechanical behavior and energy absorption characteristics of 2x2 twill woven sisal-glass hybrid epoxy composites focusing on interply and intraply configurations. Primarily the study aimed to evaluate the effect of hybrid configuration on tensile, compressive, shear, and quasi-static penetration properties compared to pure glass and sisal composites. Composites of pure sisal, pure glass, inteply, and intraply hybrid configurations were fabricated using a hand lay-up technique, with sisal fibers treated with 5% NaOH solution. A total of 80 samples, 5 for each test of each configuration, were tested following ASTM standards: D3039 for tensile, D695 for compressive, D3518 for shear, and D6264 for quasi-static penetration. The pure glass composite exhibited the highest tensile strength (206.65 MPa) and compressive strength (181.82 MPa), while the pure sisal composite had the lowest values in both categories (55.89 MPa and 30.91 MPa, respectively). The intraply hybrid showed superior tensile (121.75 MPa) and compressive strength (92.76 MPa) compared to the interply configuration. Shear tests revealed a maximum shear strength of 22.12 MPa for the glass composite, with the intraply hybrid showing better performance (19.1 MPa) than the interply (17.2 MPa). In quasi-static penetration tests, the intraply hybrid absorbed the most energy (22.17 J) next to pure glass (26.97J), while the interply configuration absorbed slightly less (19.68 J) but exhibited higher punch shear strength (14.9 MPa) due to its layered structure. These results demonstrated that hybridization, particularly in the intraply configuration, enhances energy absorption and mechanical performance compared to interply hybrid composites. The findings suggest that sisal-glass hybrid composites with intraply configuration could be suitable for lightweight structural applications where both strength and energy absorption are critical.