Aris Widyo Nugroho, Aris Widyo
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THE INFLUENCE OF ALOEVERA CONCENTRATION ON MORPHOLOGY AND TENSILE PROPERTIES OF ELECTROSPUN ALOEVERA-PVA NANOFIBER Sosiati, Harini; Widodo, Alif Nur; Nugroho, Aris Widyo
Jurnal Sains Materi Indonesia Vol 19, No 4: JULI 2018
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.522 KB) | DOI: 10.17146/jsmi.2018.19.4.4965

Abstract

THE INFLUENCE OF ALOE VERA CONCENTRATION ON MORPHOLOGY AND TENSILE PROPERTIES OF ELECTROSPUN ALOE VERA-PVA NANOFIBE. Aloe Vera (AV)-poly (vinyl alcohol)  (PVA) electrospinning solution with 0%, 2%, 4% and 6%AV concentrations were electrospun to explore the influence of AV concentration on the morphology and tensile properties of the nanofibers membranes. The results showed that the change in the morphology and tensile properties of electrospun AV-PVA nanofibers depends upon AV concentration of electrospinning solution. Mean fiber diameter at 2% (342 ± 0.8 nm) and 4% (337 ± 0.6 nm) AV concentrations is smaller than that at 0% (377 ± 1.1 nm) and 6% (810 ± 3.4 nm) AV concentrations with relatively uniform size distribution. Tensile strength and modulus at AV concentration of  2% (5.74 MPa and 33.99 MPa) and 4% (6.38 MPa and 34.75 MPa) are higher than that at 0% (4.98 MPa and 26.45 MPa) and 6% (2.22 MPa and 13.69 MPa), respectively. AV-PVA electrospinning solution with AV concentration ranging from 2% to 4% is considered being the optimum range that could produce the electrospun nanofibers with the tensile properties included in the range of that specified by the native skin.
Analisa Kegagalan Sambungan Las Pada Tiang Penyangga Dermaga Syahputra, Koko Nusyi; Nugroho, Aris Widyo
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
Publisher : Semesta Teknika

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Abstract

Welded join failure analysis of broken jetty head strut has been carried out to find out the root cause of the failure which was obverved at the ring welding. Specimens being made of unbroken and broken struts were characterized and analyzed. The results show that the chemical composition of the based metal and the strut welded  joins especially their phosporus content were close to that of the ASTM A 252 grade 2 standard.   A common phenomenon was noted on the hardness testing result where the hardness numbers of the weld metal zone were found being higher than those of the base metal. The Widmanstatens stucture was noticed on both the weld metal and the coarse grain zone.  Further examination of the macrostructures revealed that blow holes and incomplete fusions were detected on the weld metal of the broken struts.  These flaws may the root cause of the failure because they acted as an initial crack that may propagate until fracture.
THE INFLUENCE OF ALOEVERA CONCENTRATION ON MORPHOLOGY AND TENSILE PROPERTIES OF ELECTROSPUN ALOEVERA-PVA NANO FIBER Sosiati, Harini; Widodo, Alif Nur; Nugroho, Aris Widyo
Jurnal Sains Materi Indonesia Vol 19, No 4: JULI 2018
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (41.825 KB) | DOI: 10.17146/jsmi.2018.19.4.4973

Abstract

THE INFLUENCE OF ALOEVERA CONCENTRATION ON MORPHOLOGY AND TENSILE PROPERTIES OF ELECTROSPUN ALOEVERA-PVA NANO FIBER. Aloe Vera (AV)-poly (vinyl alcohol) (PVA) electrospinning solution with 0%, 2%, 4% and 6%AV concentrations were electrospun to explore the influence of AV concentration on the morphology and tensile properties of the nanofibers membranes. The results showed that the change in the morphology and tensile properties of electrospun AV-PVA nanofibers depends uponAV concentration of electrospinning solution.Mean fiber diameter at 2%(342  0.8 nm) and 4% (337  ± 0.6 nm) AV concentrations is smaller than that at 0% (377  ± 1.1 nm) and 6% (810  ± 3.4 nm) AV concentrations with relatively uniform size distribution. Tensile strength and modulus at AV concentration of 2% (5.74 MPa and 33.99 MPa) and 4% (6.38 MPa and 34.75 MPa) are higher than that at 0% (4.98 MPa and 26.45 MPa) and 6% (2.22 MPa and 13.69 MPa), respectively. AV-PVA electrospinning solution with AV concentration ranging from2%to 4%is considered being the optimumrange that could produce the electrospun nanofibers with the tensile properties included in the range of that specified by the native skin.
MORPHOLOGY AND TENSILE PROPERTIES OF PVA/SNAIL MUCIN NANOFIBER MEMBRANES Nugroho, Aris Widyo; Sholeh, Imam Nur; Sosiati, Harini
Jurnal Sains Materi Indonesia Vol 19, No 4: JULI 2018
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (41.825 KB) | DOI: 10.17146/jsmi.2018.19.4.4974

Abstract

MORPHOLOGY AND TENSILE PROPERTIES OF PVA/SNAIL MUCIN NANOFIBER MEMBRANES. Snail mucin has been widely known to contain agents with wound healing properties. A preliminary research with regard to the potential to manufacture composite nanofibrous membranes of polyvinyl alcohol (PVA) and snailmucin (SM) by the electrospinning technique forwound dressing applications has been conducted. The effect of SM concentration on the morphology and tensile properties of PVA/SM nanomembrane has been investigated. The PVA/SM solutions with various concentration of SM(0%, 2%, 4%, dan 6%)(w/v) were electrospun at the optimized process parameters. The morphology nanofiber membranes was observed by scanning electronmicroscopy and the average diameters of prepared nanofibers was determined by image analysis technique. The tensile test was conducted to examine the tensile properties of the nanofiber membranes being prepared according to ASTM D882. The PVA/SM nanofibre membrane possessing the tensile strength and tensile strain ranging between 3.48-5.37 MPa and 101.25- 157.13 %, respectively were successfully fabricated. Themembrane of 10%(w/v) PVA/ 2%(w/v) SMachieved the highest values of tensile strength. This phenomenon has been associated to the uniformity of fiber size diameter distribution within the membranes. It was expected that further optimization of the processing would allow development of the tensile properties compatibility requirement with this being the subject of future work by the authors.
Pembuatan Aluminium Berpori dengan metode Metalurgi Serbuk Berbahan Amonium Hidrogen Karbonat ((NH4)HCO3) sebagai Space Holder beserta Karakterisasinya Nugroho, Aris Widyo; Iswanto, Iswanto
Semesta Teknika Vol 21, No 2 (2018): NOVEMBER 2018
Publisher : Semesta Teknika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.212220

Abstract

The reseacrh on fabrication of porous aluminum using powder metallurgy technique with amonium hidrogen karbonat as space holder has been carried out. The space holder powder with various space holder mass fraction of 20%,30%, 40% and 50% in 5 gram of total mass and the aluminum powder were put into a can for mixing process. Afterward the mixed powder was compacted at 300 kg/cm2 to obtain the green body. Density of the green body was then determined by measuring its dimension and the mass. Following this, the green body was put in a furnace and heated up to 200oC with holding time of 60 minutes for space holder removal. The second heating up was carried out up to 650oC with holding time of 60 minutes for sintering process and the furnace was then switched off for cooling. Porosity of the sintered porous aluminum was calculated and its microstructure was examined using an optical microscop. The compressive strength of the porous material was evaluated using universal testing machine. The result show that the porosity increases with an increase of the mass fraction in the range of 56-74% with the compressive strength in opposite way. The strength was found in the range of 1.2-15.7 MPa. All specimens show a typical britlle materials.
MORPHOLOGY AND TENSILE PROPERTIES OF PVA/SNAIL MUCIN NANOFIBER MEMBRANES Nugroho, Aris Widyo; Sholeh, Imam Nur; Sosiati, Harini
Jurnal Sains Materi Indonesia Vol 19, No 4: JULI 2018
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (627.351 KB) | DOI: 10.17146/jsmi.2018.19.4.4966

Abstract

MORPHOLOGY AND TENSILE PROPERTIES OF PVA/SNAIL MUCIN NANOFIBER MEMBRANES. Snail mucin has been widely known to contain agents with wound healing properties. A preliminary research with regard to the potential to manufacture composite nanofibrous membranes of polyvinyl alcohol (PVA) and snailmucin (SM) by the electrospinning technique forwound dressing applications has been conducted. The effect of SM concentration on the morphology and tensile properties of PVA/SM nanomembrane has been investigated. The PVA/SMsolutions with various concentration of SM(0%, 2%, 4%, dan 6%)(w/v) were electrospun at the optimized process parameters. The morphology nanofiber membranes was observed by scanning electronmicroscopy and the average diameters of prepared nanofibers was determined by image analysis technique. The tensile test was conducted to examine the tensile properties of the nanofiber membranes being prepared according to ASTM D882. The PVA/SM nanofibre membrane possessing the tensile strength and tensile strain ranging between 3.48-5.37 MPa and 101.25- 157.13 %, respectively were successfully fabricated. Themembrane of 10%(w/v) PVA/ 2%(w/v) SMachieved the highest values of tensile strength. This phenomenon has been associated to the uniformity of fiber size diameter distribution within the membranes. It was expected that further optimization of the processing would allow development of the tensile properties compatibility requirement with this being the subject of future work by the authors.
Karakterisasi Permukaan Pada Aluminium Anodized-Dyed dengan Pewarna Alami Kunyit Muslim, Ahmad; Nugroho, Aris Widyo
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 1 (2018): JUNI 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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Abstract

Dyeing on anodizing process can be done with chemical or natural dyes. Indonesia has a variety of useful plants as a natural dye, one of which is turmeric. The purpose of this research is to know the effect of turmeric dye concentration variation on color brightness, macro structure, surface roughness, oxide layer thickness and wear rate on aluminum anodizing result. Aluminum plate with 1.5 mm thick was cut with size of 50 x 30 mm. The plate was performed anodizing process with 2 amperes of current, 12 volt of voltage for 30 minutes. Dyeing was carried out using commercially available turmeric powder. The dyeing process used variations in concentration of 10, 20 and 30 gram per liter of water at temperature of 90-97 ° C for 30 minutes. The coloring results were tested for color brightness by image analysis software, macro structure test and oxide layer thickness using optical microscope and surface roughness test using roughness tester and wear test with Ogoshi method. Test results showed the effect of turmeric concentration variation concentration on color brightness, macro structure, surface roughness and wear rate. The highest color brightness (RGB) is obtained on a variation of turmeric concentration of 10 gram / liter. The surface macro structure showed the existence of homogeneous pores. The most uniform colored staining is obtained on the variation of turmeric concentration of 30 grams / liter. Whilst the highest surface roughness was found on aluminum which had been anodized with variation of turmeric concentration of 30 gram / liter with the value of 1,344 μm, its wear value presents the lowest of 2.07 x 10-10 mm2 / kg. The concentration variation of the dye solution did not affect the thickness of the resulting oxide layer.
Pengaruh Feed Rate dan Kecepatan Putar Pin Tool Friction Stir Welding (FSW) terhadap Kekuatan Tarik dan Kekerasan Aluminium 5052 Rahman, Muhammad Budi Nur; Nugroho, Aris Widyo; Wardhana, Bayu Satriya
JMPM : Jurnal Material dan Proses Manufaktur Vol 2, No 2 (2018): DESEMBER 2018
Publisher : JMPM : Jurnal Material dan Proses Manufaktur

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Abstract

AbstrakFriction Stir Welding (FSW) adalah proses pengelasan yang memanfaatkan alat bundar yang menimpa dua potong pelat yang akan disambung. Hasil pengelasan dipengaruhi oleh input panas yang dihasilkan antara alat pin dan bahan las. Tujuan dari penelitian ini adalah mengetahui pengaruh laju umpan dan rotasi alat pin FSW terhadap sifat mekanik Aluminium 5052. Lembaran logam dihubungkan dengan metode FSW dengan variasi laju umpan 20, 60, 120 , 180 mm/menit dan rotasi pin tool 1500, 2500, 360 rpm menggunakan holder cylinder tool pin dengan panjang 22mm dan 4mm. Pengujian mekanis yang dilakukan adalah uji tarik, uji kekerasan Vickers mikro dan pengamatan struktur mikro menggunakan mikroskop optik dan SEM. Hasil penelitian menunjukkan bahwa semakin cepat laju umpan, kekuatan tarik semakin rendah, tetapi regangan tarik meningkat. Pada laju umpan 600 mm/menit, kekuatan tarik diperoleh 187 MPa dengan regangan 12,4% dan laju umpan 180 mm/menit kuat tarik 103 MPa dengan regangan 3,17%. Rotasi lebih cepat dari alat pin, kekuatan tarik meningkat, koneksi solid dan menyatu, dan pada 1500 rpm kekuatan tarik dari 112 MPa menjadi 207 MPa pada 3600 rpm. Semakin besar laju umpan dan rotasi alat pin, nilai kekerasan meningkat di mana tingkat umpan 20 mm/menit kekerasan 44,8 VHN menjadi 86,4 VHN pada laju umpan 120 mm/menit, sedangkan alat putaran pin 1500 Kekerasan rpm 51,3 VHN menjadi 69,6 VHN pada 3.600 rpm. AbstractFriction Stir Welding (FSW) is a welding process that utilizes a round tool that impinges on the two pieces of pelates that will be spliced. Welding results are influenced by heat input which is generated between the pin tool with the material of the weld. The purpose of the research was to determine the influence of feed rate and rotation of the pin tool of the FSW on mechanical properties of Aluminum 5052. Metal Sheet connected with the method of the FSW with the variation of the feed rate 20, 60, 120, 180 mm/minute and rotation of the pin tool 1500, 2500, 360 rpm using the holder cylinder 22mm long pin tool 4mm. Mechanical testing carried out are tensile test, hardness test micro Vickers and microstructure observation using optical microscope and SEM. The results showed that the faster the feed rate then the tensile strength more low however, the tensile strain increased. At feed rate of 600 mm/minute tensile strength obtained 187 MPa with a strain of 12.4% and a feed rate of 180 mm/minute tensile strength of 103 MPa with a strain of 3.17%. The Faster rotation of the pin tool, the tensile strength increases, the connection is solid and fused, where at 1500 rpm tensile strength of 112 MPa to 207 MPa at 3600 rpm. The greater the feed rate and rotation of the pin tool then the value of hardness is increasing where the feed rate of 20 mm/minute hardness by 44.8 VHN to 86.4 VHN at a feed rate of 120 mm/minute, while the round pin tool 1500 rpm hardness of 51.3 VHN become 69,6 VHN at 3600 rpm
Improving the tensile properties of 3D printed PLA by optimizing the processing parameter Nugroho, Aris Widyo; Budiantoro, Cahyo
JEMMME (Journal of Energy, Mechanical, Material, and Manufacturing Engineering) Vol 4, No 1 (2019)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1327.23 KB) | DOI: 10.22219/jemmme.v4i1.8222

Abstract

Low-cost desktop 3D printing is now dominated by free and open source self-replicating rapid prototype. However, optimum printing process parameters have not been provided by the manufacturer, since there are several process parameters that need to be optimized to obtain acceptable dimension error and strength properties. This paper aims to present the optimum process parameters for the 3D printing process of Polylactic Acid (PLA) part using Taguchi Method. A specimen standard of ASTM D638 Type IV made of biodegradable polymer, PLA, has been used as a tensile strength test to represent printed part quality. Four printing process parameters: temperatures, extrusion width, infill density and infill pattern have been optimized using Taguchi Methods.  Test was carried out to find the highest tensile strength based on the optimum parameter setting and validated them with experiment. The result shows that the tensile strength response was predominantly influenced by infill density followed by nozzle temperature, infill pattern and extrusion width.  The optimum level setting was obtained at 75% of infill density (C3), 215oC of nozzle temperature (A3), honeycomb infill (D1) and 0.3 mm of extrusion width (B1). At optimized parameters the tensile strength PLA parts significantly was found of 30.52 MPa at a confidence interval of 95%.