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PENGEMBANGAN METODE EVALUASI KEKUATAN PROFIL BAJA PERSEGI MENGGUNAKAN PEMANFAATAN GABUNGAN TEORI MEKANISME PLASTIS DAN ELASTIS = DEVELOPMENT OF STRENGTH EVALUATION METHOD OF A SQUARE HOLLOW STEEL SECTION USING THE APPLIACATION OF COMBINED THEORIES OF PLASTIC MECHANISMS AND ELASTIC APPROACH M. Kadir, Andi; Priadi, Dedi; S. Siradj, Eddy; S, Harkali
Majalah Ilmiah Pengkajian Industri Vol 9, No 1 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

AbstractDesign analysis method developed in this study did not use a safety factor that can be used for the design of steel structures that are capable of supporting heavy working load with the weight as light as possible in order to obtain an effective and efficient structure in terms of technical and economic. In this research program, a method of cut-off strength is used as a basis of predicting the strength of a square hollow steel section affected by the interaction of concentrated-compressive load and bending moment. The method cut-off strength is illustrated in the form of two plastic and elastic curves of loaddeflection, where the value of load at an intersection of these curves is assumed to be the theoretical strength of the steel section with respect to the interaction of concentrated-compressive load and bending moment. The plastic curve is established according to a load-deflection equation that is developed through the analysis of energy equilibrium on the plastic failure mechanisms model of the steel section. Meanwhile, the elastic one is established according to another load-deflection curve that is developed through the analysis of non linear elastic concept of the steel structure. This analytical method is implemented by using computer software. In order to measure the accuracy of the design of this analytical model developed in this program, its predicted results are verified using actual strength data obtained from a number of tests on the square hollow steel sections subjected to the interaction of concentrated-compressive load and bending moment to failure. Verification results indicate that the ratio of the analytical-predicted data and experimental one is still scattered within tolerable limits of ± 20 %. AbsrakMetode analisis disain yang dikembangkan didalam penelitian ini tidak menggunakan faktor keamanan sehingga dapat digunakan untuk mendisain struktur baja yang mampu mendukung beban kerja dengan berat yang seringanmungkin sehingga diperoleh struktur yang efektif dan efisien dari segi teknis dan ekonomi. Dalam penelitian ini, suatu metode cut-off strength digunakan sebagai dasar untuk memprediksi kekuatan profil baja ringan berpenampang persegi (SHS) akibat interaksi beban tekan memusat dan momen lentur. Metode cut-off strength diilustrasikan dalam bentuk dua kurva beban-defleksi plastis dan elastis, dimana nilai beban diperpotongan kedua kurva tersebut diasumsikan sebagai kekuatan teoritis profil baja SHS terhadap interaksi tekan memusat dan momen lentur. Kurva plastis dibentuk berdasarkan persamaan beban-defleksi yang dikembangkan melalui analisis kesetimbangan energi model mekanismekerusakan plastis profil baja SHS. Sementara itu, kurva elastis dibentuk berdasarkan persamaan beban-defleksi yang dikembangkan melalui analisis non-linear elastic profil baja SHS dengan mempertimbangkan efek local buckling pada penampang profil yang tertekan. Metode analisis ini diimplementasikan dengan menggunakan perangkat lunak (software) komputer. Untuk mengukur ketelitian model analisis disain yang dikembangkan dalam penelitian ini, hasilprediksi kekuatan profil baja SHS diverifikasi menggunakan data kekuatan aktual yang dihasilkan melalui pengujian sejumlah profil baja SHS akibat interaksi beban tekan memusat dan momen lentur sampai rusak. Hasil verifikasi menunjukkan bahwa rasio data prediksi analitis dan eksperimental masihtersebar dalam batas-batas toleransi yang umum digunakan yaitu ± 20 %.

INVESTIGASI EKSPERIMENTAL PERILAKU PROFIL BAJA RINGAN BERPENAMPANG PERSEGI AKIBAT INTERAKSI BEBAN TEKAN MEMUSAT DAN MOMEN LENTUR[Behaviour Experimental Investigation of A Thin-Walled Steel Square Hollow Secton Beam Affected by the Interaction of Concentrated Compressive Load and Bending Moment] Kadir, Andi Muhdiar; Priadi, Dedi; Siradj, Eddy S; Setiyono, Harkali
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : Pusat Penelitian Metalurgi dan Material - LIPI

INVESTIGASI EKSPERIMENTAL PERILAKU PROFIL BAJA RINGAN BERPENAMPANGPERSEGI AKIBAT INTERAKSI BEBAN TEKAN MEMUSAT DAN MOMEN LENTUR. Makalah inimerupakan bagian dari program penelitian yang di fokuskan pada pengembangan metode analisa kekuatan profilbaja berdinding tipis berbentuk pipa kotak (Square Hollow Section/SHS) akibat interaksi beban tekan memusatdan momen lentur yang didasarkan pada pendekatan teori mekanisme plastis dan elastis (plastic mechanisms andelastic theories/cut-off strength) dimana tingkat akurasinya akan diverifikasi menggunakan hasil pendekatanexperimental. Pada tahap pertama penelitian ini, analisa kekuatan SHS didasarkan pada desain standar yang adayaitu British Standard (BS 5950 Part 5 1987) yang menggunakan metode langsung (direct method) dan metodedua kanal (double channels method). Pada metode eksperimental dilakukan pengujian awal yaitu pengujianmaterial dasar dari SHS dan pengujian utama yaitu pengujian kekuatan profil baja berdinding tipis berbentukpipa kotak akibat interaksi beban tekan memusat dan momen lentur. Data hasil uji material dasar digunakansebagai data masukan pada analisis kekuatan profil baja berdinding tipis berbentuk pipa kotak menggunakanBritish Standard sedangkan hasil uji kekuatan profil baja berdinding tipis berbentuk pipa kotak dijadikan sebagaiacuan dari metode analisis kekuatan yang digunakan. Hasil analisa kekuatan SHS menunjukkan bahwa hasilanalisa kekuatan dengan metode double channels memberikan hasil yang mendekati hasil experimental(perbedaan sekitar 2 % sampai 7%) dibandingkan dengan metode lansung dan hal ini masih dalam batas-batasyang dapat diterima (acceptable limits) „b 20 %. Hasil pada tahap awal berupa hasil eksperimental dan hasilanalisis kekuatan menggunakan standard desain cukup akurat dan akan digunakan sebagai pembanding denganhasil dari metode analisa kekuatan yang dikembangkan pada tahap penelitian selanjutnya. AbstractThis paper is a part of research program that focused in developing a strength analytical method of a thinwalledsteel square pipe (Square Hollow Section/SHS) affected by the interaction of concentratedcompressiveload and bending moment that its based on plastic mechanisms and elastic theories (cut-offstrength), and its accuracy will then be verified by data obtain from an experimental approach. In the firststage of this research program, the strength of SHS pipe is analyzed by using of existing code design namelyBritish Standard (BS 5950 Part 5 1987) that is implemented according to a direct method and doublechannels one. In the experimental method is performing preleminary test that basic material identificationand main test that strength measure of SHS under interaction of concentrated-compressive load and bendingmoment. The data test results of basic material is used as data input in strength analytical method of a thinwalledsteel square pipe by British Standard meanwhile the test results of a thin-walled steel square pipe isuse as reference of strength analysis method results. The results of SHS pipe strength show that the strengthestimation using the double channels method has a close value to the experimental one (scattered in between2% up to 7%) and this is within acceptable limits of  20 %. This first data results of experimental andstrength analysis by design code are accurate enough and it will be compare with the result of developing astrength analytical method at the next step research.

PENGEMBANGAN METODE EVALUASI KEKUATAN PROFIL BAJA PERSEGI MENGGUNAKAN PEMANFAATAN GABUNGAN TEORI MEKANISME PLASTIS DAN ELASTIS = DEVELOPMENT OF STRENGTH EVALUATION METHOD OF A SQUARE HOLLOW STEEL SECTION USING THE APPLIACATION OF COMBINED THEORIES OF PLASTIC MECHANISMS AND ELASTIC APPROACH M. Kadir, Andi; Priadi, Dedi; S. Siradj, Eddy; S, Harkali
Majalah Ilmiah Pengkajian Industri Vol 9, No 1 (2015): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

AbstractDesign analysis method developed in this study did not use a safety factor that can be used for the design of steel structures that are capable of supporting heavy working load with the weight as light as possible in order to obtain an effective and efficient structure in terms of technical and economic. In this research program, a method of cut-off strength is used as a basis of predicting the strength of a square hollow steel section affected by the interaction of concentrated-compressive load and bending moment. The method cut-off strength is illustrated in the form of two plastic and elastic curves of loaddeflection, where the value of load at an intersection of these curves is assumed to be the theoretical strength of the steel section with respect to the interaction of concentrated-compressive load and bending moment. The plastic curve is established according to a load-deflection equation that is developed through the analysis of energy equilibrium on the plastic failure mechanisms model of the steel section. Meanwhile, the elastic one is established according to another load-deflection curve that is developed through the analysis of non linear elastic concept of the steel structure. This analytical method is implemented by using computer software. In order to measure the accuracy of the design of this analytical model developed in this program, its predicted results are verified using actual strength data obtained from a number of tests on the square hollow steel sections subjected to the interaction of concentrated-compressive load and bending moment to failure. Verification results indicate that the ratio of the analytical-predicted data and experimental one is still scattered within tolerable limits of ± 20 %. AbsrakMetode analisis disain yang dikembangkan didalam penelitian ini tidak menggunakan faktor keamanan sehingga dapat digunakan untuk mendisain struktur baja yang mampu mendukung beban kerja dengan berat yang seringanmungkin sehingga diperoleh struktur yang efektif dan efisien dari segi teknis dan ekonomi. Dalam penelitian ini, suatu metode cut-off strength digunakan sebagai dasar untuk memprediksi kekuatan profil baja ringan berpenampang persegi (SHS) akibat interaksi beban tekan memusat dan momen lentur. Metode cut-off strength diilustrasikan dalam bentuk dua kurva beban-defleksi plastis dan elastis, dimana nilai beban diperpotongan kedua kurva tersebut diasumsikan sebagai kekuatan teoritis profil baja SHS terhadap interaksi tekan memusat dan momen lentur. Kurva plastis dibentuk berdasarkan persamaan beban-defleksi yang dikembangkan melalui analisis kesetimbangan energi model mekanismekerusakan plastis profil baja SHS. Sementara itu, kurva elastis dibentuk berdasarkan persamaan beban-defleksi yang dikembangkan melalui analisis non-linear elastic profil baja SHS dengan mempertimbangkan efek local buckling pada penampang profil yang tertekan. Metode analisis ini diimplementasikan dengan menggunakan perangkat lunak (software) komputer. Untuk mengukur ketelitian model analisis disain yang dikembangkan dalam penelitian ini, hasilprediksi kekuatan profil baja SHS diverifikasi menggunakan data kekuatan aktual yang dihasilkan melalui pengujian sejumlah profil baja SHS akibat interaksi beban tekan memusat dan momen lentur sampai rusak. Hasil verifikasi menunjukkan bahwa rasio data prediksi analitis dan eksperimental masihtersebar dalam batas-batas toleransi yang umum digunakan yaitu ± 20 %.

STUDI DIFRAKSI SINAR-X PADUAN Mg-Co-Ni YANG DIBUAT DENGAN METODE PEMADUAN MEKANIK (MECHANICAL ALLOYING) Andon Insani; Hadi Suwarno; Johny Wahyuadi; Wisnu Ari Adi; Eddy S. Siradj
Jurnal Sains Materi Indonesia EDISI KHUSUS: OKTOBER 2006
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

STUDI DIFRAKSI SINAR-X PADUAN Mg-Co-Ni YANG DIBUAT DENGAN METODE PEMADUAN MEKANIK. Telah dilakukan pembuatan paduan Mg-Co-Ni berskala nano sebagai bahan penyerap hidrogen dengan metode pemaduan mekanik. Paduan dibuat dari serbuk logam magnesium, kobalt dan nikel murni dengan menggunakan SPEX 8000 High Energy Milling (HEM). Vial dan bola yang digunakan terbuat dari bahan SS. Rasio berat bola terhadap sampel (B/S) yang digunakan adalah 1:1. Intensitas puncak-puncak difraksi dan fraksi volume dari Mg berkurang dengan bertambahnya waktu milling, yang disebabkan terbentuknya fasa amorf MgO, MgNi2 dan Mg. Perubahan fraksi volume yang cukup signifikan terjadi pada Mg dari 62,52 % pada 0 jam menjadi 23,91 % pada 40 jam, sedangkan Co dan Ni berubah berturut-turut dari 7,63 % ke 8,61 % dan dari 25,23 % ke 31,24 %. Kecuali Mg, parameter kisi Co dan Ni relatif stabil. Sedangkan ukuran kristal berkurang dengan bertambahnya waktu milling, yaitu Mg dari 29,7 nm pada 0 jam menjadi 6 nm pada 40 jam, Co dari 11 nm menjadi 9,8 nm dan Ni dari 24,5 nm menjadi 22,8 nm. Tetapi paduan Mg3CoNi2 yang diinginkan belum terbentuk yang kemungkinan disebabkan oleh rendahnya energi tumbukan.

THE EFFECT OF LI2O ONCOMPOSITE LTAP AND WINDOWS GLASSES Bambang Prihandoko; Priyo Sardjono; Anne Zulfia; Eddy Siradj
Jurnal Sains Materi Indonesia Vol 9, No 1: OKTOBER 2007
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

THE EFFECT OF LI2O ONCOMPOSITE LTAP AND WINDOWS GLASSES. Research on The Effect of Li2O on Composite LTAP and Windows Glasses have been done. Windows glasses contain of SodiumLime Silica Glasses and Na2O 11,6%, CaO 8,1%and SiO2 58,7%. LTAP ( Lithium Titanium Alumunium Phosphate ) material mixed in the slurry of powder windows glasses with composition of weight procentage 75%. The temperatures process for sintering of samples is above of glass transition at 600 oC. Then samples quenched with liquid nitrogen. The variation of Li2O addition on samples are 0, 2,5, 5 and 7,5% weight. XRD pattern of all samples has a same phenomenon of crystallization phases, i.e. LTAP with lithium silica from Li5Si2O7, Li2SiO3, Li4SiO4 and Li2Si2O5. Optimum addition oh Li2O is 7,5% weight Li2O that gift a conductivity of 1,479 x 10-7 S/cm and high value on density and smallest porosity

Pengaruh Proses Rolling terhadap Struktur Mikro dan Sifat Mekanis pada Kuningan setelah diproses ecap Julyadi Julyadi; Suryadi Suryadi; Erwin Siahaan; Eddy S. Siradj
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 2 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: Brass material widely used in industry because it has the advantage of being a metal that resists corrosion, has high ductility, good toughness and easy on the form. This study was conducted to determine the effect of rolling process on mechanical properties and microstructure of metal brass after ECAP process on brass (CuZn) 70/30. The initial step is to make the specimens with a diameter of 10 mm and height 80 mm has been done annealing 600 ° C with a hold time of 90 minutes. Then a ECAP 3-pass process and cold rolling process. To determine the mechanical properties of tensile test specimens and hardness test) and metallographic observations to determine the microstructure. The results after the execution of the research note that the specimen after passing through annealing process, ECAP and rolling have a higher hardness. Prior to treatment the specimen hardness value is 78 VHN and after treatment to 252 VHN hardness value. Metallographic observations of known properties of brass increasingly refined microstructure and grain boundary between micro become increasingly tight.

STRUKTUR MIKRO DAN SIFAT MEKANIS ALUMINIUM PADUAN SERI 6063 HASIL COR DARI CETAKAN LOGAM, PASIR RESIN FURAN DAN PASIR KOMOSSA Chris Marvin; Eddy S Siradj; Sobron Yamin Lubis
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: Material developments in Indonesia is already very advanced rapidly certainly need high level of violence but has a mass of light. Aluminum should be developed because it possesses a lightweight and available in the land of our country that is rich in agricultural products. As an alternative to strengthen aluminum alloy that is with Si and Mg, as well as the rapid cooling process when smelting. This study was conducted to observe the microstructure and mechanical properties of the raw material of aluminum alloy series 6063. Tests conducted with metal mold, furan resin sand mold, commossa sand mold, the cooling rate of each mold will affect the hardness of the material which can be seen microstructure with microstructural observations. The survey results revealed that the aluminum with a metal mold casting has a hardness of 54 HRB, furan resin sand has a hardness of 40 HRB, sand commossa has a hardness of 33 HRB. Metal mold has a shock force of 0,316 J/mm2, particularly a furan resin sand shock force of 0,265 J/mm2, commossa sand has a shock force of 0.206 J/mm2. Metal mold has a high hardness compared with furan resin sand rated second, while the sand was rated commossa end but increasingly harsh mean tenacity of a material value will increase. According to the test micro structure, the aluminum is brittle, the distance or the distribution of grain will be a meeting or a lot.

EVALUASI BESAR BUTIR TERHADAP SIFAT MEKANIS CuZn70/30 SETELAH MENGALAMI DEFORMASI MELALUI CANAI DINGIN Riyan Sanjaya; Eddy S Siradj
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 1 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: The research was conducted because of the many industries that use CuZn 70/30 as a raw material in industrialization. CuZn 70/30 was studied to obtain the strong mechanical properties of brass. Research CuZn 70/30 was evaluated using a process of heating of about 6150 ± 50C and then held for 90 minutes. The next process is the process of cold rolling by using a variety of reduction and then tested by using a Vickers hardness testing, tensile testing, observation of the microstructure. The result of this research is a fine microstructure (below 10 μm), hardness (HV 211.67). Tensile test also conducted to get how much resistance CuZn 70/30 to resist the pull. The cold rolling process causing the decrease the mechanical properties and also increase the plastic properties of the brass.

Influence of Strain Rate and Temperature of Hot Tension Testing on Mechanical Properties of Medium Carbon Steel S48C Priadi, Dedi; Setyadi, Iwan; Siradj, Eddy S.
Makara Journal of Technology Vol. 7, No. 1
Publisher : UI Scholars Hub

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Influence of Strain Rate and Temperature of Hot Tension Testing on Mechanical Properties of Medium Carbon Steel S48C. The characterization of S48C by hot tension testing was done to understanding the influence of temperature and strain rate for S48C flow stress, that close relationship with its forge ability. The hot tension testing was performed on temperatures and strain rates variation (T 850, 900, 950 0C and έ 0,01;1 s-1). The result of hot tension testing showed that increasing temperature decreases ultimate tensile strength (UTS) and flow stress of S48C. The higher decreasing of UTS is on 950 0C about 85% from room temperature condition, while the higher decreasing of flow stress has occurred on 950 0C about 31 % compare to conditions of temperature 850 0C, strain 0,23 & strain rate (έ)1 second- 1 and about 27% compare to the same conditions but έ= 0,01 second-1 . For increasing strain rate from 0,01 to 1 second-1 on the temperature range (850-950 0C) increases UTS about 33 – 50 % and flow stress about 46–53%.

INVESTIGASI EKSPERIMENTAL PERILAKU PROFIL BAJA RINGAN BERPENAMPANG PERSEGI AKIBAT INTERAKSI BEBAN TEKAN MEMUSAT DAN MOMEN LENTUR[Behaviour Experimental Investigation of A Thin-Walled Steel Square Hollow Secton Beam Affected by the Interaction of Concentrated Compressive Load and Bending Moment] Andi Muhdiar Kadir; Dedi Priadi; Eddy S Siradj; Harkali Setiyono
Metalurgi Vol 28, No 1 (2013): Metalurgi Vol.28 No.1 April 2013
Publisher : National Research and Innovation Agency (BRIN)

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