Purnama, Agih (2020) Analisa Pengaruh Panjang Dan Misalignment Terhadap Respon Tegangan-Regangan Spesimen Tubular Adhesive Lap Joint Pada Laju Regangan Tinggi Menggunakan Pemodelan Finite Element Explicit Dynamic. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sifat mekanis sambungan adhesive dipengaruhi oleh geometri dan propertis dari base material dan bulk adhesive. Salah satu metode karakterisasi sifat mekanis material pada laju regangan tinggi adalah uji split hopkinson pressure bar (SHPB). Berdasarkan standar ASTM, spesimen uji SHPB berbentuk silinder pejal dengan rasio panjang terhadap diameter yang disarankan antara 0,5 hingga 2. Standar tersebut terlalu kecil untuk diterapkan pada tubular adhesive lap joint. Namun, spesimen tubular lap joint yang panjang sangat rawan terhadap bending, barelling, dan misalignment yang mengakibatkan kesalahan pada respon tegangan-regangan. Pada tugas akhir ini dilakukan penelitian mengenai pengaruh panjang dan misalignment terhadap respon tegangan-regangan spesimen tubular adhesive lap joint. Kurva tegangan-regangan tersebut diperoleh dari simulasi numerik menggunakan ANSYS Explicit dynamics.
Tujuan dari penelitian ini adalah untuk merancang geometri spesimen tubular adhesive lap joint pada uji SHPB dimana pengaruh bending, barelling, dan misalignment dapat diabaikan sehingga mendapatkan hasil pengujian yang valid. Tubular adhesive lap joint dalam penelitian ini terdiri dari dua adherend pipa alumunium yang berongga dengan panjang spesimen uji yang divariasikan dengan variasi panjang diantaranya yaitu 14, 20, 30, 40, 50, 60, 70, 90, dan 100 mm. Masing-masing variasi panjang memiliki panjang overlap sambungan yang sama yaitu sebesar 10 mm. Selain itu, pengaruh misalignment sebesar 8,57° terhadap respon tegangan-regangan juga diinvestigasi. Hasil yang didapatkan dari simulasi dengan misalignment tersebut dibandingkan dengan hasil simulasi spesimen tanpa misalignment. Sebelum simulasi, dilakukan uji konvergensi meshing terlebih dahulu dengan cara menentukan sizing meshing dengan error yang paling kecil. Uji konvergensi tersebut dilakukan agar hasil simulasi valid.
Panjang spesimen memiliki pengaruh terhadap modulus kombinasi sambungan yang mana semakin panjang spesimen, maka nilai modulus kombinasi semakin besar, dan berlaku sebaliknya. Sementara misalignment juga memberikan pengaruh yang cukup signifikan terhadap modulus kombinasi sambungan yang mana misalignment sambungan dapat memperkecil nilai modulus kombinasi sambungan
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The mechanical properties of adhesive joints are influenced by the geometry and properties of the base material and bulk adhesive. One method of characterizing the mechanical properties of materials at high strain rates is the Split Hopkinson Pressure Bar (SHPB) test. According to the ASTM standard, the SHPB test specimen is a solid cylinder with a recommended length to diameter ratio of 0.5 to 2. The standard is too small to apply to tubular adhesive lap joints. However, long tubular lap joint specimens are highly susceptible to bending, barelling, and misalignment resulting in errors in stress-strain response. In this final project, a research was conducted on the effect of length and misalignment on the stress-strain response of tubular adhesive lap joint specimens. The stress-strain curve is obtained from numerical simulations using ANSYS Explicit dynamics.
The purpose of this research is to design the geometry of tubular adhesive lap joint specimens in the SHPB test where the effects of bending, barelling, and misalignment can be ignored so that valid test results are obtained. Tubular adhesive lap joint in this study consisted of two hollow aluminum pipe adherends with the length of the test specimen varied with length variations including 14, 20, 30, 40, 50, 60, 70, 90, and 100 mm. Each length variation has the same overlap length of 10 mm. In addition, the effect of a misalignment of 8.57 ° on the stress-strain response was also investigated. The results obtained from the simulation with misalignment are compared with the simulation results of specimens without misalignment. Before the simulation, the meshing convergence test is conducted first by determining the sizing meshing with the smallest error. The convergence test is carried out so that the simulation results are valid.
The length of the specimen has an influence on the joint combination modulus where the longer the specimen, the greater the combination modulus value, and vice versa. While the misalignment also has a significant effect on the joint combination modulus, where the connection misalignment can reduce the joint combination modulus value.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Specimen lengths, Misalignment, Tubular adhesive lap joint, Combination modulus, Split Hopkinson pressure bar Panjang spesimen, Misalignment, Tubular adhesive lap joint, modulus kombinasi, Split hopkinson pressure bar |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Agih Purnama |
| Date Deposited: | 25 Aug 2020 02:13 |
| Last Modified: | 28 Nov 2023 03:58 |
| URI: | http://repository.its.ac.id/id/eprint/80305 |
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