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INDONESIA
Jurnal technoscientia
Published by Institut Sains dan Teknologi AKPRIND
ISSN : 19798415     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Arjuna Subject : -
Articles 17 Documents
 1   2 
Search results for , issue "Technoscientia Vol 2 No 1 Agustus 2009" : 17 Documents clear
PENGARUH TEMPERATUR TEMPER TERHADAP SIFAT MEKANIK DAN KETAHANAN KOROSI PADUAN Fe-1,52Al-1,44C Kartikasari, Ratna
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.701 KB) | DOI: 10.34151/technoscientia.v2i1.417

Abstract

On the basis of economic and lower density considerations, Fe-Al-C alloy could be a good candidate for replacing some of the conventional stainless steel. Wherein, Al is used to replace the expensive alloy element in conventional Fe-Cr-C system. The aim of the research is to investigate tempering temperature influence to mechanical properties and corrosion resistance of Fe-1,52Al-1,44C in the 3.5% NaCl solution. Fifty kilograms of Fe-Al-C were prepared from mild steel scrap, high purity aluminium, and Fe-C. The alloy was prepared in a high frequency induction furnace with alloying was done in the ladle. Optical microstructure, mechanical properties and corrosion rate were examined. The corrosion rate, were carried out with immersion methode in 3.5% NaCl. The optical micrograph shows that as cast Fe-1,52Al-1,44C alloy has ferrite and pearlite microstructure and has tendency to become ferritic microstructure with encreasing tempering temperature. Maximun tensile strength and maximum hardness took placed after hardening that was respectively 74,44kg/mm2 and 298,7 VHN. Maximum elongation was reached at 450oC tempering temperature. The result of corrosion testing showed that the alloy has decreasing corrosion rate with the increasing tempering temperature.
PEMECAHAN SENYAWA KOMPLEKS DALAM KAOLIN DAN PENGAMBILAN ALUMINA DENGAN METODE KALSINASI DAN ELUTRIASI -, Sukamta; Budiman, Arif; -, Sutijan; W, Akhmad Bening; Budiharto, Segar
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (196.363 KB) | DOI: 10.34151/technoscientia.v2i1.418

Abstract

Caolin or chines clay seldom used in industry, is formed of very little particles especially caolinite, i.e. a mixture of aluminum oxyde (Al2O3), silika oxyde (SiO2) and wa-ter (H2O). Each composition posseses a different characteristic. The article discusses a separation alumina from caolin which was from Semin, Klaten, the midle of Java, by cal-cination and elutriation methods. The calcination method is a separation one by breaking the bond between the substances using heat. In this case, it was used 800oC because at this temperature it reached vitrification point and the complex bond was broken. The sam-ple was dried under the sun, crushed, and screened by multiple screening i.e. 200 mesh, 230 mesh, 270 mesh, 325 mesh and 400 mesh. From the screening process it was ga-thered fraction between 325 and 400 mesh as the most one, therefor this farction was us-ed as a sample. This one then was elutriated with fluid terminal velocity was varied. It was obtanied that the concentration of alumina incresed relatively high at the fluid velovity of 0.1278 cm/s and 0.2117 cm/s i.e. the alumina concentration increased of 5,2% dan 7,4% became 76.81%.
PENGARUH SANDWICH LAMINATED COCO MAT DAN CHOPPED STRAND MAT TERHADAP KEKUATAN MATERIAL KOMPOSIT -, Tarkono
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (360.778 KB) | DOI: 10.34151/technoscientia.v2i1.419

Abstract

The application of coco fibre is widely open. In rural area, as a main source of coco fibre, the fibre IS only used for cooking and family products. As the technology development, how coco fibre can be applied as a part of composites materials. If it compound with other specific components, we can produce a new material with better mechanical properties. In this research, coco fibre with 0,2% wetness, compound with latex then pressed to get a coco mat with 2 mm thickness. Coco mat then formed with chopped strand mat to get a sandwich laminate composite. The original tensile strength of coco mat is 2,47 kgf/mm2 , and it will increased to 12,93 kgf/mm2 if it formed as sandwich laminate coco fibre. The tensile strength improves about 80, 90%.
MODAL TESTING AND FINITE ELEMENT MODEL UPDATING OF TWO NOMINALLY IDENTICAL CONCRETE BUILDING FLOORS Widjaja, Taufik Ramlan
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1022.521 KB) | DOI: 10.34151/technoscientia.v2i1.422

Abstract

This paper describes a combined approach of modal testing and finite element (FE) analysis for vibration analysis of a structural system comprising two nominally identical concrete building floors located at adjacent levels. Initially, a field test of a full-scale joint two-level floor system was conducted to obtain the first five mode shapes and natural frequencies. Sensitivity-based FE model correlation and updating were then con-ducted to match the dynamic characteristics of the FE model with the experimental data. By setting certain indicators of good correlations between analytical and experimental models, an updated FE model comprising two nominally identical building floor was obtained.
PERUBAHAN LAJU KOROSI AKIBAT TEGANGAN DALAM DENGAN METODE C-RING Rusianto, Toto
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (185.201 KB) | DOI: 10.34151/technoscientia.v2i1.423

Abstract

Stress Corrosion Craking (SCC) generally attack to metals (steel) under internal stress. Fastener could arised internal stress to material that fastened, such as plat or other material. The experiment to observed SCC could used C-Ring method as standard ASTM G38-01(2007). Fastener and base material that made C-ring corroded in sea water with various stresses that was arrised by fastener. The result of research showed that hardness of spesimen (fastener and C-ring) was increase with increase in stress, the hardness indicated there were internal stress in spesimen. Corrosion rate for spesimen was increase with increase in stress, the higher corrosion rate at spesimen of C-ring for arrised stress 256 kg was 24,20 MPY. and lower arrised stress 69 kg was 19,14 MPY. The spesimen of fastener for arrised stress 256 kg was 7,97 MPY. and lower arrised stress 69 kg was 6,89 MPY. Duration experiment time were 9 day.
Jurnal Technoscientia Vol 2 no 1 Agustus 2009-Cover-Daftar isi Technoscientia, Jurnal Teknologi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.933 KB) | DOI: 10.34151/technoscientia.v2i1.686

Abstract

Jurnal Technoscientia Vol 2 no 1 Agustus 2009-Cover-Daftar isi
Jurnal Technoscientia Vol 2 no 1 Agustus 2009-Full Paper Technoscientia, Jurnal Teknologi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 2 No 1 Agustus 2009
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8083.995 KB) | DOI: 10.34151/technoscientia.v2i1.687

Abstract

Jurnal Technoscientia Vol 2 no 1 Agustus 2009-Full Paper

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