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Efek Shot Peening Terhadap Korosi Retak Tegang (SCC) Baja Karbon Rendah dalam Lingkungan Air Laut Mohammad Badaruddin; Sugiyanto Sugiyanto
Jurnal Teknik Mesin (Sinta 3) Vol. 7 No. 1 (2005): APRIL 2005
Publisher : Institute of Research and Community Outreach, Petra Christian University

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Abstract

The aim of this study is to investigate the effect of shot peening on stress corrosion cracking of a low carbon steel in ocean water environment. The dimension of specimens were prepared in accordance with the ASTM G39. The hardness testing was carried out using microvickers with 0,25 kgf load in the longitudinal direction. The corrosion cracking test was immersed into artificial sea water for about 7 months. The test shows that the pitting corrosion is dominantly nucleated at the metal film interface. The biggest pitting corrosion was occurred under the static loading of 70 for the specimens unpeened. The presence of pitting corrosion promotes stress corrosion cracking. The cracking has a intergranular branched morphology which is typical for the chloride cracking of low carbon steel Abstract in Bahasa Indonesia : Tujuan penelitian ini adalah untuk mengetahui pengaruh shot peening terhadap korosi retak tegang baja karbon rendah dalam lingkungan air laut yang mengandung 3,5 % NaCl. Dimensi spesimen uji korosi dibuat berdasarkan standar ASTM G39. Pengujian kekerasan dilakukan menggunakan mikrovickres dengan beban 0,25kgf pada arah ketebalan bahan. Uji korosi dilakukan dengan mencelupkan dalam air laut buatan selama 7 bulan. Hasil pengujian menunjukan bahwa spesimen uji cenderung lebih dominan terserang korosi sumuran (pitting corrosion). Korosi sumuran yang terbesar terdapat pada spesimen uji tanpa shot peening pada pembebanan static 70%. Terbentuknya korosi sumuran menjadi pemicu terbentuknya korosi retak tegang. Bentuk retak yang terdapat pada daerah korosi sumuran adalah intergranular bercabang yang merupakan hasil serangan klorida pada baja karbon rendah. Kata kunci: shot peening, korosi sumuran, korosi retak tegang.
LOW-CYCLE FATIGUE OF COLD-DRAWN TYPE 304 AUSTENITIC STAINLESS STEEL IN ANNEALING CONDITIONS Ambar Pambudi; Mohammad Badaruddin; Sugiyanto Sugiyanto
Indonesian Journal of Engineering and Science (IJES) Vol. 3 No. 2 (2022): Table of Content
Publisher : Asosiasi Peneliti Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (598.588 KB) | DOI: 10.51630/ijes.v3i2.39

Abstract

Type 304 austenitic stainless steel, or better known as SS304, generally has alloying elements: C < 0.1%, Cr 18 – 20%, Fe 66 – 74%, Mn <2%, Ni 8 – 10.5%, P <0.045%, Si <1%, and S <0.030%. In general, this material has good ductility, high tensile strength, and excellent corrosion resistance. In application, type SS304 will be subjected to repeated loading, and eventually, the material will undergo plastic deformation, which leads to structural failure in a short life. The failure of SS304 is generally due to the inability of the material to repeat loading, which results in large amounts of plastic deformation so that the SS304 will experience fatigue and then fracture. Based on the description above, this study aims to evaluate the LCF properties of 304 CDS stainless steel with annealing heat treatment. The parameter used was the strain amplitude 0.003 – 0.013 mm/mm. The results of this study revealed that the highest fatigue life in the LCF test was experienced by steel with heat treatment at an amplitude of 0.003 mm/mm with 48367 cycles. In contrast, at the amplitude condition of 0.013 mm/mm, the fatigue life of the steel decreased drastically with the resulting plastic strain being larger, namely 0.0094 mm/mm and elastic strain of 0.0035 mm/mm, with an average modulus of elasticity of 194 GPa. Annealing treatment conditions experienced decreased mechanical strength but tended to be ductile. Using Basquin-Coffin-Manson Equation, empirical equations to predict LCF of 304 stainless steels can be determined.
PEMANFAATAN MUSEUM DALAM PELESTARIAN BUDAYA DAERAH LAMPUNG SEBAGAI UPAYA PENGEMBANGAN MEDIA PEMBELAJARAN GURU SEKOLAH DASAR Maman Surahman; Sugiyanto Sugiyanto; Rizky Drupadi; Deviyanti Pangestu
Jurnal Pemberdayaan: Publikasi Hasil Pengabdian Kepada Masyarakat Vol. 4 No. 3 (2020)
Publisher : Universitas Ahmad Dahlan, Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/jp.v4i3.2838

Abstract

Kegiatan ini dilatarbelakangi oleh tuntutan perubahan paradigma guru dalam mengembangkan media pembelajaran sekolah dasar pada Kurikulum 2013 SD. Walaupun pemerintah telah menentukan KI dan KD untuk Kurukulum 2013 namun guru juga diharapkan mampu mengembangkan media pembelajaran untuk menunjang pembelajaran di kelas. Tujuan kegiatan ini untuk meningkatkan kompetensi pedagogik guru sekolah dasar di Kota Bandar Lampung dalam merancang media pembelajaran di SD sesuai dengan tuntutan Kurikulum 2013, dan juga agar guru di Bandar Lampung diharapkan mampu mengembangkan media pembelajaran yang mengimplementasikan pelestarian budaya daerah Lampung.
Diseminasi Teknologi Lampu Darurat Berbahan Air Garam di Desa Ekoharjo Kabupaten Lampung Tengah Irza Sukmana; A Y E Risano; M. Arif Wicaksono; Sugiyanto Sugiyanto; Nafrizal Nafrizal; M. Badaruddin
Society : Jurnal Pengabdian Masyarakat Vol 1, No 5 (2022): September
Publisher : Edumedia Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55824/jpm.v1i5.190

Abstract

Electrical energy is needed and continues to increase in line with the population and economic growth, including in Lampung Province. Problems may occur once happen the rotating power outages, in this case the community uses candle or kerosene lamps. The use of candle or kerosene lamps may cause danger due to the combustion gas produced and a potential of fire. Therefore, it is necessary to make efforts to produce alternative energy sources in energy renewal, one of which is to build a salt water electrical energy source using the sea cell method, to build an energy independent village. Electricity through electrochemistry is one of the alternative electrical energy that can be generated by utilizing an oxidation-reduction process in which an electrochemical cell with a pair of Cu(Ag)-Zn electrodes is used. The electrodes are made of Cu fibers with a length of 2 m per strand as many as 25 strands and a Zn plate with dimensions of 10 cm long and 3.5 cm wide. Cu is coated with Ag metal using the electroplating method, while Zn metal is protected with Mg metal as a sacrificial anode. The electrical energy produced from this lamp is expected to be applied as renewable energy in a sustainable manner. The University of Lampung has a very good relationship with Ekoharjo village in Central Lampung district of Lampung Province.