Marcos, Juan Carlos (2019) Studi Eksperimen dan Analisa Pengaruh Ketebalan Adhesive terhadap Kekakuan Scarf Adhesive Joint pada Laju Regangan Tinggi. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Adhesive joint merupakan jenis sambungan alternatif pada struktur selain sambungan mekanis seperti welding, riveting, brazing, dan soldering. Adhesive joint memiliki kelebihan dibandingkan dengan sambungan mekanis lainnya, yaitu mampu menyambungkan material yang berbeda jenis. Hal ini memungkinkan pembuatan struktur kendaraan ringan dengan menggunakan berbagai jenis material yang lebih ringan dibandingkan dengan baja. Dalam aplikasinya, adhesive joint harus mampu menopang struktur kendaraan pada pembebanan dinamik. Karakteristik dinamik adhesive joint berupa kekakuan sangat penting untuk memastikan keamanan, keandalan, dan kenyamanan struktur akibat beban tumbukan.
Dalam tugas akhir ini, akan diteliti pengaruh ketebalan adhesive terhadap kekakuan scarf adhesive joint akibat beban tumbukan. Ketebalan adhesive yang diteliti adalah 0.5, 1, 1.5, 2, dan 3 mm. Split Hopkinson pressure bar digunakan sebagai alat karakterisasi dinamik scarf adhesive joint. Dari pengujian akan diperoleh rekaman gelombang regangan yang merambat di dalam rangkaian pressure bar berupa incident pulse, reflected pulse, dan transmitted pulse. Sinyal yang diperoleh kemudian digunakan untuk memperoleh kurva tegangan-regangan scarf adhesive joint. Kekakuan scarf adhesive joint diperoleh dengan menghitung nilai slope pada kurva tegangan-regangan yang diperoleh. Pengujian scarf adhesive joint dilakukan pada laju regangan yang konsisten, yaitu 550±30 s-1. Hasil yang diperoleh menunjukkan bahwa pengujian scarf adhesive joint dilakukan pada area elsatis, dimana scarf adhesive joint mengalami kompresi dan kemudian mengalami ekspansi. Pada awal kurva tegangan-regangan (fase loading), scarf adhesive joint mengalami deformasi elastis dimana tegangan memiliki nilai yang proporsional dengan nilai regangan. Setelah mencapai nilai tegangan maksimal, scarf adhesive joint mengalami fase unloading dimana nilai tegangan berkurang hingga mencapai nilai 0 MPa. Kekakuan scarf adhesive joint diperoleh dengan menghitung nilai slope garis awal kurva tegangan-regangan yang diperoleh. Hasil yang diperoleh menunjukkan bahwa ketebalan adhesive mempengaruhi kekakuan scarf adhesive joint. Kekakuan scarf adhesive joint meningkat secara linier dengan bertambahnya ketebalan adhesive pada rentang 0.5 hingga 3 mm. Hasil dari penelitian ini akan sangat berguna untuk mengetahui performa scarf adhesive joint dalam aplikasi dimana sambungan mengalami beban tumbukan, misalnya dalam konstruksi otomotif.
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Adhesive joint is one of alternative fasteners that can be used on structures beside mechanical fasteners such as welding, riveting, brazing, and soldering. Adhesive joint has an advantage compared to other mechanical joints, which is the ability to join different type of materials. This advantage makes it possible to build a light vehicle structure using lighter materials compared to steel. In the application, adhesive joint must be able to resist dynamic loading on vehicle structure. Adhesive joint’s characteristic of stiffness is very important to ensure the safety, reliability, and comfort of structure subjected to impact loading. In this final project, the effect of adhesive thickness on scarf adhesive joint stiffness subjected to impact loading will be investigated. The adhesive thickness to be inspected are 0.5, 1, 1.5, 2, and 3 mm. Split Hopkinson pressure bar is used as a dynamic characterization device for scarf adhesive joint. Strain waves that propagate in pressure bars in the form of incident pulses, reflected pulse, and transmitted pulse will be obtained from testing. The signals obtained are then used to obtain the stress-strain curve of scarf adhesive joint. The stiffness of scarf adhesive joint is obtained by calculating the slope of the stress-strain curve obtained.
Testing of scarf adhesive joints were carried out at a consistent strain rate of 550±30 s-1. The results obtained showed that testing of scarf adhesive joints were carried out in the elastic area, where scarf adhesive joints was compressed and then experienced expansion. At the beginning of the stress-strain curve (loading phase), scarf adhesive joints undergo elastic deformation where the value of stress is proportional to the value of strain. After reaching the maximum stress value, scarf adhesive joints undergo an unloading phase, where the value of stress decreases to 0 MPa. The stiffness of scarf adhesive joints is obtained by calculating the initial slope of the stress-strain curve. The results obtained indicate that adhesive thickness affects the stiffness of scarf adhesive joint. The stiffness of scarf adhesive joint increases linearly with the increasing of adhesive in the range of 0.5 to 3 mm. The results of this study will be very useful to determine the performance of scarf adhesive joint in applications where joints experience impact loading, for example in automotive construction.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Kekakuan, Ketebalan Adhesive, Scarf Adhesive Joint, Split Hopkinson Pressure Bar |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA455.A34 Adhesives |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Juan Carlos Marcos |
| Date Deposited: | 21 Jul 2026 07:28 |
| Last Modified: | 21 Jul 2026 07:28 |
| URI: | http://repository.its.ac.id/id/eprint/66344 |
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