Pengaruh Sudut Chamfer Adherent Dan Panjang Recessing Adhesive Terhadap Distribusi Tegangan Geser Pada Adhesive Single Lap Joint

Putri, Yunanda Ayu Andika (2021) Pengaruh Sudut Chamfer Adherent Dan Panjang Recessing Adhesive Terhadap Distribusi Tegangan Geser Pada Adhesive Single Lap Joint. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Saat ini, upaya besar sedang dilakukan di bidang otomotif. Upaya yang dilakukan yaitu mengurangi berat struktur kendaraan tanpa kehilangan kinerja mekanisnya. Adhesive lebih cocok untuk mendukung perkembangan struktur yang ringan. Dari banyaknya jenis sambungan adhesive, tipe sambungan single lap adalah yang paling umum digunakan karena geometrinya yang sederhana dan efisiensi strukturalnya yang tinggi. Namun, pada kenyataanya distribusi tegangan geser pada single lap joint tidak merata, yaitu memuncak pada ujung-ujung sambungan. Berbagai teknik telah diadopsi para peneliti untuk meningkatkan efisiensi dan mendistribusikan tegangan secara merata pada single lap joint.
Pada penelitian kali ini, peneliti tertarik untuk menganalisa sambungan adhesive tipe single lap yang dimodifikasi, dikarenakan pada hasil grafik analitis dari volkersen, distribusi tegangan geser di tengah layer sambungan adhesive sepanjang overlap (25mm) bernilai sangat kecil, maka dari itu peneliti bermaksud menambahkan recessing dengan tiga variasi (10mm; 12.5mm; 15mm) pada adhesive layer tanpa mengurangi volume adhesive-nya. Selain itu peneliti juga memberikan efek chamfering adherent dengan tiga variasi sudut (15o; 30o; 45o). Dan juga menggabungkan kedua variasi tersebut. Penelitian akan melakukan permodelan numerik menggunakan Metode Elemen Hingga tiga dimensi (3D), dengan software ANSYS Workbench. Dan juga menggunakan metode Cohesize Zone Modelling (CZM) sebagai pembanding.
Berdasarkan hasil simulasi, dengan memberikan efek chamfering adherent pada single lap joint nilai tegangan puncak paling optimum ada pada variasi sudut chamfer 15o, yaitu turun sebesar 52.91%. Dan dengan memberikan efek recessing adhesive pada single lap joint, nilai tegangan puncak paling optimum ada pada variasi panjang recess 10mm, yaitu turun sebesar 5.42 %. Untuk efek gabungan pada single lap joint nilai tegangan puncak paling optimum ada pada variasi panjang recess 10mm dengan variasi sudut chamfer, turun sebesar 44.3%. Hasil simulasi dengan menggunakan CZM, trendline dari grafik tegangan geser pada ketiga variasi geometri single lap joint memiliki kesamaan dengan simulasi yang tidak menggunakan CZM. Dan panjang kerusakan terendah ada pada single lap joint dengan efek chamfer adherent 15o yaitu dengan panjang keruskan 0.2223mm. Ini berarti bahwa dengan menambahkan chamfer adherent adalah pilihan terbaik untuk memperkuat sambungan.
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Currently, great efforts are being made in the automotive field. Efforts are being made to reduce the weight of the vehicle structure without losing its mechanical performance. Adhesives are more suitable for supporting the development of lightweight structures. Of the many types of adhesive joints, the single lap joint type is the most commonly used due to its simple geometry and high structural efficiency. However, in reality the distribution of shear stress on a single lap joint is uneven, which peaks at the ends of the joint. Various techniques have been adopted by researchers to increase efficiency and distribute stress evenly in single lap joints.
In this study, researchers are interested in analyzing the modified single lap adhesive joint, because in the analytical graph results from Volkersen, the shear stress distribution in the middle of the adhesive joint layer along the overlap (25mm) is very small, therefore the researcher intends to add recessing with three variations (10mm; 12.5mm; 15mm) on the adhesive layer without reducing the adhesive volume. In addition, the researchers also gave an adherent chamfering effect with three variations of angles (15o; 30o; 45o). And also combines the two variations. The research will perform numerical modeling using the three-dimensional (3D) Finite Element Method, using ANSYS Workbench software. And also using the Cohesize Zone Modeling (CZM) method.
Based on the simulation results, by giving an adherent chamfering effect on a single lap joint, the most optimum peak stress value is at a chamfer angle variation of 15o, which is down 52.91%. And by giving a recessing adhesive effect to the single lap joint, the most optimum peak stress value is in the 10mm recess length variation, which is down 5.42%. For the combined effect on the single lap joint, the most optimum peak stress value is in the 10mm recess length variation with the chamfer angle variation, decreased 44.3%. The simulation results using CZM, the trendline of the shear stress graph in the three variations of the single lap joint geometry has similarities with the simulations that do not use CZM. And the lowest length of damage is on single lap joint with 15o adherent chamfer effect, which is 0.2223mm damage length. This means that adding an adherent chamfer is best option for strengthening the joint.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Adhesive, Single lap joint, Shear Stress, Tegangan Geser
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Yunanda Ayu Andika Putri
Date Deposited:	16 Aug 2021 04:36
Last Modified:	16 Aug 2021 04:36
URI:	http://repository.its.ac.id/id/eprint/86978

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