Obkektif kajian ini adalah untuk mengkaji prestasi struktur panel (struktur sekunder) di antara bahan logam dan bahan komposit, membuat perbandingan prestasi struktur antara bahan logam dan bahan komposit melalui kaedah FEA, iaitu modal analisis, dan analisis berkonsep, iaitu, kaedah Ashby. Sifat-sifat bagi bahan logam dan bahan komposit adalah diperolehi daripada buku-buku. Semasa menggunakan kaedah FEA ke atas bahan logam dan bahan komposit, MSC Nastran workshop telah dirujuk. Dalam FEA, perbandingan telah dibuat antara aluminium, keluli, titanium (bahan logam) and Kevlar 49 – epoxy, graphite – epoxy, carbon – epoxy (bahan komposit). Sifat-sifat bahan tersebut dikaji berdasarkan frekuensi asli. Bagi kaedah Ashby, prestasi struktur berdasarkan keandalan dan ketahanan bagi bahan logam (aluminium and titanium) dan bahan komposite (GFRP and CFRP) telah dikaji. Selain itu, prestasi struktur ke atas struktur berlapis (sandwich) juga dibincangkan. Keputusan yang diperolehi telah menunjukkan bahan komposit mempunyai prestasi struktur yang lebih baik daripada bahan logam. Ciri-ciri bahan pilihan telah dikaji berdasarkan perbandingan sifat-sifat seperti kekuatan, modulus elastik, kekejuran, ketumpatan, kelelahan, dan karatan. Keputusan juga telah menunjukkan industri penerbangan sekarang lebih cenderung dalam menggunakan bahan komposit jika dibandingkan dengan bahan logam kerana prestasi struktur bahan komposit adalah sangat memuaskan.
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The objectives of this thesis are to carry out comparative study on the structural performance of panel (secondary structure) using metallic and composite materials, comparing the performance of metallic and composite materials through finite element analysis, i.e. modal analysis and conceptual analysis, i.e. the Ashby method. The properties of metallic and composite materials are obtained from a series of handbooks and reference books. When practicing FEA on both metallic and composite materials, MSC Nastran workshop is referred. In FEA, comparison is made between aluminium, steel, titanium (metallic materials) and Kevlar 49 – epoxy, graphite – epoxy, carbon – epoxy (composite materials). Characteristic of those materials is studied through determining the natural frequencies. For the Ashby method, structural performance based on reliability and durability is studied in metallic materials (aluminium and titanium) and composite materials (GFRP and CFRP). Besides, structural performance of sandwich structure is also discussed. The results show that composite materials have better structural performance than metallic materials. Characteristics of the materials are studied through comparing properties namely, strength, elastic modulus, stiffness, density, fatigue, and corrosion. The results are similar to the trend of aviation industry which nowadays has increasingly used composite materials rather than metallic materials for optimized structural performance.
Comparative study on structural performance of panel (secondary structure) using metallic and composite material_Lee Shih Yung_A2_2009_NI