Susetyo, Rahmad Try (2022) Analisis Pengaruh Properties Adhesive Dan Panjang Overlap Terhadap Sifat Mekanik Sambungan Adhesive Tipe Single Lap Yang Dibebani Impact Menggunakan Metode Elemen Hingga. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan sambungan adhesive pada struktur ringan untuk kendaraan semakin berkembang serta melengkapi sambungan mekanis konvensional. Berkembangnya penerapan sambungan adhesive disebabkan oleh keuntungan yang didapatkan dibanding dengan jenis sambungan konvensional. Sambungan adhesive mampu mendapatkan kekuatan yang diinginkan, meminimalkan konsentrasi tegangan saat diberi beban, dan menyesuaikan dengan bentuk geometri yang diharapkan. Hal ini berkaitan dengan sifat mekanik yaitu kekuatan dan elastisitas sambungan pada suatu material. Alat yang dapat mengetahui sifat mekanik dari sambungan pada suatu material yaitu Split Hopkinson Pressure Bar (SHPB). SHPB digunakan untuk mengetahui respons material pada laju deformasi tinggi. Respons tersebut dihitung dari sinyal regangan yang diukur pada input bar dan output bar. Hasil tersebut merepresentasikan stress-strain curve dari kombinasi adherend dan adhesive dalam satu kesatuan. Akan tetapi, dalam hal ini distribusi tegangan pada lapisan adhesive tidak nampak. Simulasi numerik dengan metode elemen hingga dapat digunakan untuk menjelaskan distribusi tegangan tersebut. Penelitian ini menganalisis pengaruh properties adhesive dan panjang overlap terhadap sifat mekanik berupa strength, elasticity, Modulus Young, dan energy density pada sambungan adhesive lap joint. Variasi yang diberikan adalah properties adhesive yakni prony series beserta Young’s Modulus dari epoxy resin dan polyurethane serta panjang overlap sebesar 10 mm, 15 mm, 20 mm, dan 25 mm. Hasil yang didapatkan dari pengujian ini menunjukkan bahwa properties adhesive beserta panjang overlap berpengaruh terhadap sifat mekanik pada sambungan adhesive. Prony series yang memodelkan material viskoelastik yang semakin sulit untuk terdeformasi dan semakin tinggi nilai Young’s Modulus maka semakin tinggi pula strength, Modulus Young, dan energy density pada sambungan adhesive. Dan, prony series yang memodelkan material viskoelastik yang semakin mudah untuk terdeformasi dan semakin rendah nilai Young’s Modulus maka semakin tinggi elasticity pada sambungan adhesive. Selain itu, semakin panjang overlap yang digunakan pada sambungan adhesive maka semakin sulit sambungan adhesive untuk terdeformasi sehingga kemampuan fleksibilitas juga semakin berkurang akibatnya strength, Modulus Young, dan energy density mengalami peningkatan sementara elasticity mengalami penurunan. Distribusi tegangan dari peel stress dan shear stress dengan kegagalan terkecil terjadi pada epoxy resin dengan panjang overlap 25 mm. Hal ini dikarenakan pengaruh dari prony series yang sulit untuk terdeformasi dan nilai Young’s Modulus yang tinggi sehingga kekuatan adhesive juga semakin tinggi pula disertai dengan panjang overlap 25 mm yang berpengaruh dalam meningkatkan kekuatan adhesive. Epoxy resin dengan panjang overlap 25 mm mengalami kegagalan yang melebihi batas aman, yakni ketika menerima impact dengan initial velocity dari striker bar sebesar 20 m/s untuk peel stress dan 30 m/s untuk shear stress.
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The use of adhesive joints in lightweight structures for vehicles is growing and complementing conventional mechanical joints. The development of the application of adhesive joints is due to the advantages obtained compared to conventional types of joints. Adhesive joints are able to obtain the desired strength, minimize stress concentrations when given a load, and conform to the desired geometric shape. This is related to the mechanical properties, namely the strength and elasticity of the connection in a material. A tool that can determine the mechanical properties of the connection on a material is the Split Hopkinson Pressure Bar (SHPB). SHPB is used to determine the response of materials at high deformation rates. The response is calculated from the strain signal measured at the input bar and output bar. These results represent the stress-strain curve of the combination of adherend and adhesive in one unit. However, in this case the stress distribution on the adhesive layer is not visible. Numerical simulation using the finite element method can be used to explain the stress distribution. This study analyzes the effect of adhesive properties and overlap length on mechanical properties such as strength, elasticity, Young's modulus, and energy density at the adhesive lap joint. The variations given are adhesive properties, namely the prony series along with Young's Modulus of epoxy resin and polyurethane and overlapping lengths of 10 mm, 15 mm, 20 mm, and 25 mm. The results obtained from this test indicate that the adhesive properties along with the overlap length affect the mechanical properties of the adhesive joint. Prony series which models viscoelastic materials that are increasingly difficult to deform and the higher the Young's Modulus value, the higher the strength, Young's modulus, and energy density at the adhesive joint. And, the prony series which models a viscoelastic material that is easier to deform and the lower the Young's Modulus value, the higher the elasticity of the adhesive joint. In addition, the longer the overlap used in the adhesive joint, the more difficult it is for the adhesive joint to deform so that the flexibility ability also decreases as a result of which the strength, Young's modulus, and energy density increase while the elasticity decreases. The stress distribution of peel stress and shear stress with the smallest failure occurred in the epoxy resin with an overlap length of 25 mm. This is due to the influence of the prony series which is difficult to deform and the high value of Young's Modulus so that the adhesive strength is also higher, accompanied by an overlap length of 25 mm which has an effect on increasing the adhesive strength. Epoxy resin with an overlap length of 25 mm failed to exceed the safe limit, namely when it received an impact with an initial velocity of the striker bar of 20 m/s for peel stress and 30 m/s for shear stress.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 621.825 Sus a-1 2022 |
| Uncontrolled Keywords: | Split Hopkinson Pressure Bar, Adhesive, Overlap, Single Lap Joint |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA492.W4 Welded joints |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Marsudiyana - |
| Date Deposited: | 18 Feb 2025 07:38 |
| Last Modified: | 18 Feb 2025 07:38 |
| URI: | http://repository.its.ac.id/id/eprint/118797 |
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