Arzaki, Naufal Alfi (2020) Prediksi Parameter Material Viscoelastic Epoxy Adhesive Menggunakan Permodelan Finite Element Method. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Di bidang otomotif, adhesive joint digunakan untuk membangun konstruksi kendaraan ringan. Penggunaan Adhesive joint melengkapi sambungan konvensional seperti welding dan riveting karena dapat menyatukan dua material yang berbeda jenis yang tidak dapat dilas. Lebih dari itu distribusi tengangan yang merata pada adhesive joint dapat mengurangi inisiasi keretakan pada sambungan.
Sifat mekanik adhesive joint ditentukan oleh properties dari base material dan bulk adhesive. Sifat mekanik bulk adhesive dapat direkayasa dengan mengubah komposisi antara resin dan hardener. Namun, dampak perubahan komposisi tersebut terhadap sifat viscoelastoc material adhesive belum banyak diteliti. Padahal parameter material tersebut menentukan kesuksesan pemodelan finite element untuk rekayasa struktur, khususnya pada beban laju regangan tinggi. Maka dari itu diperlukan penelitian untuk mengetahui dampak perubahan komposisi resin/hardener terhadap parameter viscoelastic adhesive. Pada penelitian ini, parameter-parameter tersebut ditentukan melalui simulasi uji split Hopkinson pressure bar (SHPB) yang dimodelkan dengan finite element method. Parameter-parameter tersebut ditentukan secara trial and error sehingga menghasilkan respon tegangan-regangan yang sama dengan yang diperoleh dari eksperimen SHPB. Pendekatan numerik ini digunakan sebagai alternatif pengujian creep untuk memangkas biaya dan waktu yang dibutuhkan. Di sisi
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lain, sifat viscoelastic adhesive tersebut diperlukan untuk pemodelan finite element yang valid untuk analisa adhesive joint.
Penelitian ini bertujuan untuk mendapatkan parameter pada model material epoxy adhesive untuk komposisi resin/hardener yang divariasikan yaitu 1:1,2:1,1:2,3:2,2:3. Parameter – parameter material viscoelastic yang didapatkan dari simulasi adalah instantaneous shear modulus, shear modulus, dan decay time. Didapatkan juga parameter cepat rampat gelombang pada parameter material adhesive dari model equation of shock (EOS). Analisa yang dilakukan untuk menentukan kolerasi antara nilai parameter material dengan komposisi resin/hardener. yang Setelah dilakukan simulasi kemudian akan dianalisa korelasi antara komposisi tersebut dengan parameter material viscoelastic yaitu, instantaneous shear modulus, shear modulus, dan decay time serta C1 (cepat rambat).
Dari hasil yang diperoleh dapat diketahui jika Parameter – parameter material viscoelastic dan cepat rambat parameter material adhesive bersesuaian dengan variasi komposisi adhesive. Penambahan nilai instantaneous shear modulus, shear modulus dan C1 menyebabkan kenaikan nilai young modulus dari adhesive, sama halnya dengan penambahan persentase epoxy pada penelitian Kenny Varian jika dilihat secara kualitatif. Dari penelitian ini dapat diketahui bahwa pemodelan Split Hopkinson Pressure Bar untuk pengujian variasi komposisi resin/hardener yang berbeda-beda membutuhkan hasil ekperimen yang diuji pada alat yang memadai dan valid agar simulasi pada penelitian ini dapat tervalidasi secara kuantitatif maupun kualitatif.
Kata kunci: Epoxy, Hardener, Butt adhesive joint, Young’s modulus, Split Hopkinson Pressure Bar
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In the automotive sector, adhesive joints are used to build light vehicle construction. The use of adhesive joints complements conventional joints such as welding and riveting because they can join together two different types of materials that cannot be welded. Moreover, even distribution of tension on the adhesive joint can reduce the initiation of cracks in the joint.
The mechanical properties of the adhesive joint are determined by the properties of the base material and bulk adhesive. The mechanical properties of bulk adhesives can be engineered by changing the composition between resin and hardener. However, the impact of these changes in composition on the viscoelastoc properties of the adhesive material has not been widely studied. In fact, these material parameters determine the success of finite element modeling for structural engineering, especially at high stress load loads. Therefore, research is needed to determine the impact of changes in resin / hardener composition on the viscoelastic adhesive parameters. In this research, these parameters were determined through a simulation of the split hopkinson pressure bar (SHPB) test modeled by the finite element method. These parameters were determined by trial and error so as to produce a stress-strain response similar to that obtained from the SHPB experiment. This numerical approach is used as an alternative to creep testing to reduce costs and time required. On the other hand, the viscoelastic properties of the adhesive are
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required for a valid finite element modeling for adhesive joint analysis.
The research purpose is to obtain the parameters of the epoxy adhesive material model for the resin / hardener composition which is varied, namely 1: 1,2: 1,1: 2,3: 2,2: 3. The viscoelastic material parameters obtained from the simulation are instantaneous shear modulus, shear modulus, and decay time. Also obtained parameter of wave fast propagation in the adhesive material parameter from the equation of shock (EOS) model. The analysis was carried out to determine the correlation between the material parameter values and the resin / hardener composition. After the simulation is carried out, the correlation between the composition will be analyzed with the parameters of the viscoelastic material, namely, instantaneous shear modulus, shear modulus, and decay time and C1 (fast propagation).
From the results obtained, it can be seen if the viscoelastic material parameters and the fast propagation of the adhesive material parameters correspond to the variations in the composition of the adhesive. The addition of instantaneous shear modulus, shear modulus and C1 values increased the value of the young modulus of the adhesive, as well as the addition of the percentage of epoxy in Kenny Varian's research when viewed qualitatively. From this research it can be seen that the Split Hopkinson Pressure Bar modeling for testing different variations of resin / hardener composition requires experimental results tested on adequate and valid tools so that the simulation in this study can be validated quantitatively and qualitatively.
Keywords: Epoxy, Hardener, Butt adhesive joint, Young’s modulus, Split Hopkinson Pressure Bar
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Epoxy, Hardener, Butt adhesive joint, Young’s modulus, Split Hopkinson Pressure Bar |
| 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: | Naufal Alfi Arzaki |
| Date Deposited: | 24 Aug 2020 01:56 |
| Last Modified: | 13 Jun 2023 15:46 |
| URI: | http://repository.its.ac.id/id/eprint/80264 |
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