Studi Eksperimental untuk Analisa Pengaruh Komposisi Epoxy/Hardener terhadap Young Modulus Bulk Epoxy Adhesive pada Pembebanan dengan Laju Regangan Tinggi

Varian, Kenny (2020) Studi Eksperimental untuk Analisa Pengaruh Komposisi Epoxy/Hardener terhadap Young Modulus Bulk Epoxy Adhesive pada Pembebanan dengan Laju Regangan Tinggi. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penggunaan adhesive joint pada struktur ringan kendaraan semakin berkembang dan melengkapi sambungan mekanis konvensional. Hal ini disebabkan oleh kemampuan adhesive joint yang ringan, tahan korosi, dan tahan terhadap tumbukan serta mampu menyambungkan material yang berbeda jenis. Adhesive joint menjadi kunci untuk membuat struktur kendaraan yang lebih ringan dan lebih aman. Di masa depan, aplikasi sambungan adhesive dalam konstruksi otomotif akan semakin berkembang. Oleh karena itu, sambungan adhesive, selain harus mampu menopang struktur pada pembebanan statis, juga harus mampu menopang struktur pada pembebanan dinamis. Sifat mekanik adhesive joint ditentukan oleh properties dari base material dan bulk adhesive. Variasi perubahan komposisi epoxy resin dengan hardener mengakibatkan polimerisasi tidak sempurna dan mengubah sifat mekanik adhesive layer. Pada tugas akhir ini akan dilakukan penelitian tentang sensitifitas respon tegangan-regangan butt adhesive joint terhadap pengaruh variasi komposisi epoxy dengan hardener. Pengamatan khusus juga dilakukan pada Young’s modulus sambungan yang diestimasi dari slope awal kurva tegangan-regangan yang diperoleh dari uji Split Hopkinson Pressure Bar (SHPB). Uji SHPB akan dilakukan pada adhesive butt joint dengan base material alumunium alloy AISI 6061 silindris dengan diameter 20 milimeter dan panjang 50 milimeter. Epoxy adhesive layer tebal 2 milimeter dengan variasi komposisi epoxy:hardener sebesar 2:1, 2:3, 1:1, 3:2, dan 1:2 digunakan untuk menyambungkan base material. Lima spesimen akan diuji untuk setiap variasi komposisi. T-test statistical method akan digunakan untuk menganalisa pengaruh komposisi terhadap Young’s modulus sambungan. Pengujian butt adhesive joint dilakukan pada laju regangan yang konsisten, yaitu 367±28 s-1. Hasil yang diperoleh menunjukkan bahwa pengujian butt adhesive joint dilakukan pada area elastis, dimana butt adhesive joint mengalami kompresi dan kemudian mengalami ekspansi. Pada awal kurva tegangan-regangan (fase loading), butt adhesive joint mengalami deformasi elastis dimana tegangan memiliki nilai yang proporsional dengan nilai regangan. Setelah mencapai nilai tegangan maksimal, butt adhesive joint mengalami fase unloading dimana nilai tegangan berkurang hingga mencapai nilai 0 MPa. Nilai Young’s modulus butt adhesive joint diperoleh dengan menghitung nilai slope garis awal kurva tegangan-regangan yang diperoleh. Hasil yang diperoleh menunjukkan bahwa variasi komposisi adhesive mempengaruhi nilai Young’s modulus butt adhesive joint. Young’s modulus butt adhesive joint meningkat secara non-linier dengan bertambahnya epoxy pada adhesive, namun mengalami penurunan saat komposisi epoxy 2 dan hardener 1. Nilai Young’s modulus terbesar didapat pada komposisi epoxy 3 dan hardener 2 senilai 0.87 GPa. Selain itu didapatkan hasil untuk nilai regangan maksimal terdapat pada komposisi epoxy 2 dan hardener 3. Hasil dari penelitian ini akan sangat berguna untuk mengetahui performa butt adhesive joint dalam aplikasi dimana sambungan mengalami beban tumbukan, misalnya dalam konstruksi otomotif. ======================================================================================================= The adhesive joint on lightweight vehicle structures was developed and equipped with conventional mechanical joints. This is caused by the ability of adhesives that are lightweight, corrosion resistant, collision resistant, and able to connect different material types. Adhesive joint is the key to making the vehicle structure lighter and safer. In the future, the application of adhesive joints in automotive construction will further develop. Adhesive joint must be able to support the structure in static loading and able to support the structure in dynamic loading. The mechanical properties of adhesive joint are determined by the properties of base material and bulk adhesive. Variation in composition of epoxy resin with hardener produce imperfect polymerization and changes mechanical properties of adhesive layer. In this final project will be carried out research on the sensitivity of butt adhesive joint stress-strain response to the effect of variations in composition epoxy with hardener. Special observations were also made on Young’s modulus which was estimated from the initial slope of the stress-strain curve obtained from Split Hopkinson Pressure Bar (SHPB). The SHPB test will be carried out on adhesive butt joint with a base material of cylindrical aluminum alloy AISI 6061 with a diameter 20 milimeters and length 50 milimeter. The epoxy adhesive have thickness 2 milimeter with a variation ratio of epoxy: hardener is 2:1, 2:3, 1:1, 3:2, and 1:2 are used to joint the base material. Five specimens will be tested for each composition variation. T-test Statistical method will be used to analyze the effect of composition on Young’s modulus. Testing of butt adhesive joint were carred out at a consistent strain rate of 326 ±28s-1. The result showed that testing of butt adhesive joint were carried out in elastic area, where the butt adhesive joint was compressed and then expansion. At the beginning of stress-strain curve(loading phase), butt adhesive joint undergo elastic deformation where the value of stress is proportional to value of strain. After reaching the maximum stress value, butt adhesive joint undergo an unloading phase, where the value of stress decreases to 0 MPa. The value Young’s modulusof butt adhesive joint is obtained by calculating the initial slope of stress-strain curve. The results show that the variation of adhesive composition affects the value of Young’s modulus butt adhesive joint. Young’s modulus of butt adhesive joint increases non-linearly with increasing epoxy in adhesive, but Young’s modulus decreases when the composition ratio of epoxy:hardener is 2:1. The largest Young’s modulus value is obtained when the composition ratio of epoxy:hardener is 3:2 with 0.87 GPa. In addition, the results for maximum strain value is obtained when the composition ratio of epoxy:hardener is 2:3. The results of this study will be very useful to determine the performance of butt adhesive joint in applications where joint undergoes impact loading, for example in automotive construction.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Komposisi, Composition, Butt adhesive joint, Young’s modulus, Split Hopkinson Pressure Bar, Adhesive, Epoxy-Hardener
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User: KENNY VARIAN
Date Deposited: 04 Aug 2020 09:23
Last Modified: 04 Aug 2020 09:23
URI: https://repository.its.ac.id/id/eprint/76921

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