Optimasi Kekuatan Tarik Dan Impak Material Biokomposit Pada Proses Mesin Cetak Sistem Injeksi Menggunakan Metode Taguchi-Grey-Fuzzy

Cahyono, Hiding (2018) Optimasi Kekuatan Tarik Dan Impak Material Biokomposit Pada Proses Mesin Cetak Sistem Injeksi Menggunakan Metode Taguchi-Grey-Fuzzy. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Polymer matrix composite (PMC) merupakan material komposit dengan serat sintetis yang banyak digunakan dalam dunia industri. Kekurangan dari PMC dengan serat sintetis adalah dapat mencemari lingkungan dan harganya mahal. Serat sisal adalah serat alam yang berasal dari tumbuhan agave sisalana yang mampu digunakan sebagai alternatif serat sintetis. PMC yang memiliki penguat serat alam disebut sebagai biokomposit. Kualitas dari biokomposit dapat dievaluasi dengan menggunakan kekuatan tarik dan kekuatan impak. Karakteristik kualitas dari kekuatan tarik dan kekuatan impak adalah semakin besar semakin baik (larger the better). Agar sepesifikasi dari kedua sifat mekanik tersebut tercapai, maka perlu dilakukan optimasi multirespon. Penelitian ini dilakukan untuk menentukan pengaturan level-level dari parameter-parameter proses injeksi moulding yang dapat memaksimalkan parameter respon berupa kekuatan tarik dan kekuatan impak secara bersamaan. Biokomposit yang digunakan pada penelitian ini terdiri dari 10 wt% serbuk serat sisal, 85 wt% polypropylene (PP) dan 5 wt% maleic anhydride polyproylene (MAPP). Biokomposit dicetak dengan menggunakan mesin cetak sistem injeksi. hasil pencetakan tersebut berupa sepesimen uji tarik dan uji impak. Eksperimen dilakukan dengan memvariasikan empat parameter proses yang masing-masing memiliki 3 level, yaitu barrel temperature 210, 215, dan 220 oC, injection pressure 50, 55 dan 60 bar, holding pressure 35, 40, dan 45 bar dan injection velocity 55, 65 dan 75 mm/det. Rancangan eksperimen menggunakan ortogonal array L27 (34), dengan replikasi sebayak tiga kali. Kekuatan tarik diuji dengan mesin uji tarik merk AUTOGRAPH AG-10TE dan uji impak diuji dengan menggunakan mesin mini impact tester jenis charpy. Optimasi multirespon dilakukan dengan menggunakan metode Taguchi-Grey-Fuzzy. Hasil penelitian menunjukkan bahwa parameter–parameter proses Barrel Temperatur, Injection Pressure, Holding Pressure dan Injection Velocity berpengaruh secara signifikan terhadap kekuatan tarik dan kekuatan impak. Kekuatan tarik dan kekuatan impak maksimum dapat dicapai dengan mengatur parameter proses barrel temperature pada 210 oC, injection pressure pada 55 bar, holding pressure pada 40 bar dan injection velocity pada 75 mm/det. Dengan kombinasi parameter tersebut kekuatan tarik meningkat dari 23,09 MPa menjadi 24,42MPa (5,78%) dan kekuatan impak meningkat dari 3,03 kJ/m2 menjadi 4,30 kJ/m2 (42,02%). ========================================================================================================= Polymer matrix composite (PMC) is a composite material with synthetic fibers that are widely used in the industrial application. The deficiency of PMC with synthetic fibers usage could contaminate environment and expensive. Sisal fiber is a natural fiber derived from agave sisalana plants that can be used as an alternative to synthetic fibers. PMCs that have natural fiber reinforcement are referred to as biocomposites. The quality of the biocomposite can be evaluated by using tensile strength and impact strength. The quality characteristic of tensile strength and impact strength is the larger the better. In order to obtain a higher mechanical properties simultaneously, it is necessary to do multiresponse optimization. This experiment was conducted to determine the setting of the levels of the injection molding process parameters that can maximize the response parameters of tensile strength and impact strength simultaneously. The biocomposites used in this study consisted of 10 wt% sisal fiber, 85 wt% polypropylene (PP) and five wt% (maleic anhydride polypropylene) MAPP. The biocomposite is then made using an injection molding machine. The final product of this injection molding machine is in the form of tensile test and impact test speciments. Experiments were conducted by varying the four process parameters which each had three levels, namely barrel temperature, injection pressure, holding pressure and injection velocity. Barrel temperature varied by 210, 215, and 220 oC. Injection pressure is varied by 50, 55 and 60 bar. Holding pressure varied by 35, 40, and 45 Bar. Injection velocity varied by 55, 65 and 75 mm/s. This experimental design was established using an orthogonal array L27 (34), with three time replication. Tensile strength was tested using Autograph AG-10TE tensile test machine and the impact test was tested using a mini-impact machine charpy test method. Multiresponse optimization was done using the Taguchi-Gray-Fuzzy method. The results are Barrel Temperature, Injection Pressure, Holding Pressure and Injection Velocity parameters had a significant effect on tensile strength and impact strength. Tensile strength and maximum impact strength can be achieved by adjusting the barrel temperature process variables at 210 °C, injection pressure at 55 bar, holding pressure at 40 bar and injection velocity at 75 mm/s. With these parameters the tensile strength increased from 23,09 MPa to 24,42MPa (5,78%) and impact strength increased from 3,03 kJ/m2 to 4,30 kJ/m2 (42,02%).

Item Type: Thesis (Masters)
Additional Information: RTM 668.412 Cah o
Uncontrolled Keywords: Injection molding parameters process, Taguchi-grey-fuzzy, tensile strength, impact strength
Subjects: Q Science > QA Mathematics > QA276 Mathematical statistics. Time-series analysis. Failure time data analysis. Survival analysis (Biometry)
Q Science > QA Mathematics > QA278.2 Regression Analysis. Logistic regression
Q Science > QA Mathematics > QA278.5 Principal components analysis. Factor analysis. Correspondence analysis (Statistics)
Q Science > QA Mathematics > QA402 System analysis.
Q Science > QA Mathematics > QA248_Fuzzy Sets
T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology > TP1140 Polymers
T Technology > TS Manufactures > TS156 Quality Control. QFD. Taguchi methods (Quality control)
Divisions: Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User: Hiding Cahyono
Date Deposited: 15 Apr 2020 09:18
Last Modified: 07 Aug 2020 07:40
URI: https://repository.its.ac.id/id/eprint/51013

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