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Jamasri .
Fakultas Teknik, Universitas Gadjah Mada, Yogyakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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INFLUENCE OF SINTERING TEMPERATURE AND HOLDING TIME ON TENSILE STRENGTH AND SHRINKAGE OF PVC SPECIMEN ON INDIRECT PRESSURE-LESS SINTERING PROCESS Widyanto, S. A; Riyadi, S; Tontowi, A. E; Jamasri, Jamasri; Rochardjo, H. S
Mesin Vol 21, No 1 (2006)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (331.211 KB)

Abstract

Sintering process has proven to be a manufacturing process that can produce a mechanical part with high geometric complexity. Development of alternative sintering process is continuously conducted to find the most inexpensive process. A solution process which is called indirect pressure-less sintering were proposed in this research. Generally this process of making a mechanical part is initiated with arranging powder by deposition machine, and continued by sintering process in conventional furnace. Optimal parameters that consist of sintering temperature and holding time in this process were optimized in this paper. PVC powder and sand casting (silica) were used as a material product and supporting powder respectively. The variations of sintering temperature are 100, 105, 110, 115 and 120°C, while the holding times are 2, 4, 6 and 8 hours. The optimal parameters were found by measuring tensile strength and shrinkage of specimen. The experiment results showed that dimensional stability of specimen can not be maintained for sintering temperature of 115°C with holding time longer than 2 hours. In sintering temperature higher than 120°C, PVC material directly starts to melt so that the volume of specimen increased. This was caused by binding of supporting powder. The strength of binding mechanism was measured when sintering temperature was higher than 107°C. In sintering temperature of 113°C with varying the holding time (2-8 hours) gave the longest variation of tensile strength.
RELIABILITY-CENTERED MAINTENANCE (RCM) EVALUATION METHOD IN THE INDUSTRY APPLICATION, CASE STUDY: FERTILIZER COMPANY, INDONESIA Khasanah, Rahayu; Dawal, Siti Zawiah Md.; -, Jamasri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (420.004 KB) | DOI: 10.34151/technoscientia.v8i1.190

Abstract

Nowadays, Reliability-centered Maintenance (RCM) has become the solution to determine the type of maintenance tasks and inspections needs to be performed to the assets in achieving effective and efficient maintenance. However, implementing RCM is not enough to achieve optimization of maintenance planning. The evaluation, as one of the important point should be done to prove the benefits of RCM and to continuously improve the maintenance planning. In this study, the effects of RCM implementation in the industry application were evaluated, as a step for continuous improvement in RCM application. The case study is an Ammonia plant in a fertilizer company in Indonesia. This research evaluates the RCM effects by investigating and analyzing Downtime Loss and Mean Time between Failures (MTBF). The problems in RCM implementation in the case study also investigate as a basic for giving the recommendation to the company as a way to improve the RCM implementation. In general, the findings from the investigation of case study affirm that RCM implementation do improve the plant performance which are showed by decreasing of Downtime Loss and Mean Time between Failures. The significant problems that become pitfalls in RCM implementation process are about the worker’s culture and understanding on the RCM process. Overall, the study shows that RCM implementation brings many benefits to the company by decreasing the Downtime Loss and Mean Time between Failures which can be resulted as the higher profit for the company.
PENGARUH PENGELASAN FCAW TANPA DAN DENGAN PENAMBAHAN PANAS TERHADAP PERUBAHAN SIFAT MEKANIK DAN STRUKTUR MIKRO SAMBUNGAN LAS Subeki, Nur; -, Jamasri; Ilman, M.N.; Iswanto, P.T.
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (777.254 KB) | DOI: 10.34151/technoscientia.v7i2.204

Abstract

The Welding processes are delivery used joining steel, especially used in civil construction, piping and ship manufacturing. Many of the benefits that can be obtained from welded joint is the joining can be cheap, rapid manufacturing, varied shape and lighter construction. One of the welding techniques that is widely used for joining the steel construction is Flux Core Arc Welding (FCAW). The problem that found in welding joints is the tensile strength in welding area is low and uneven hardness in the weld joint. The aim of this research was to determine the mechanical properties of FCAW Welding process and find out micro structures formed by the addition of heat around the welding.In this research, FCAW welding has been divided into two groups; the ones group is manufacturing without addition of heating, and the second group is manufacturing by heating 200 °C. Every group of manufactures would be test by chemical compositions, macro photos, micro photos, tensile strength and hardness number. The results of this research shows that the addition of heat at 200 °C could be increase the yield strength and ultimate strength. The heating also could be very small impact on the change in the hardness of weld area, but it could be reduce the hardness in HAZ area significantly. Micro structure formed then the weld area has been dominated by acicular ferrite micro structure, grain boundary ferrite dominate in coarse HAZ, the pearlite and ferrite with grain aggrandizement take place in smooth HAZ and base metals.
RELIABILITY-CENTERED MAINTENANCE (RCM) EVALUATION METHOD IN THE INDUSTRY APPLICATION, CASE STUDY: FERTILIZER COMPANY, INDONESIA Khasanah, Rahayu; Dawal, Siti Zawiah Md.; -, Jamasri
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 8 No 1 Agustus 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v8i1.190

Abstract

Nowadays, Reliability-centered Maintenance (RCM) has become the solution to determine the type of maintenance tasks and inspections needs to be performed to the assets in achieving effective and efficient maintenance. However, implementing RCM is not enough to achieve optimization of maintenance planning. The evaluation, as one of the important point should be done to prove the benefits of RCM and to continuously improve the maintenance planning. In this study, the effects of RCM implementation in the industry application were evaluated, as a step for continuous improvement in RCM application. The case study is an Ammonia plant in a fertilizer company in Indonesia. This research evaluates the RCM effects by investigating and analyzing Downtime Loss and Mean Time between Failures (MTBF). The problems in RCM implementation in the case study also investigate as a basic for giving the recommendation to the company as a way to improve the RCM implementation. In general, the findings from the investigation of case study affirm that RCM implementation do improve the plant performance which are showed by decreasing of Downtime Loss and Mean Time between Failures. The significant problems that become pitfalls in RCM implementation process are about the worker’s culture and understanding on the RCM process. Overall, the study shows that RCM implementation brings many benefits to the company by decreasing the Downtime Loss and Mean Time between Failures which can be resulted as the higher profit for the company.
PENGARUH PENGELASAN FCAW TANPA DAN DENGAN PENAMBAHAN PANAS TERHADAP PERUBAHAN SIFAT MEKANIK DAN STRUKTUR MIKRO SAMBUNGAN LAS Subeki, Nur; -, Jamasri; Ilman, M.N.; Iswanto, P.T.
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v7i2.204

Abstract

The Welding processes are delivery used joining steel, especially used in civil construction, piping and ship manufacturing. Many of the benefits that can be obtained from welded joint is the joining can be cheap, rapid manufacturing, varied shape and lighter construction. One of the welding techniques that is widely used for joining the steel construction is Flux Core Arc Welding (FCAW). The problem that found in welding joints is the tensile strength in welding area is low and uneven hardness in the weld joint. The aim of this research was to determine the mechanical properties of FCAW Welding process and find out micro structures formed by the addition of heat around the welding.In this research, FCAW welding has been divided into two groups; the ones group is manufacturing without addition of heating, and the second group is manufacturing by heating 200 °C. Every group of manufactures would be test by chemical compositions, macro photos, micro photos, tensile strength and hardness number. The results of this research shows that the addition of heat at 200 °C could be increase the yield strength and ultimate strength. The heating also could be very small impact on the change in the hardness of weld area, but it could be reduce the hardness in HAZ area significantly. Micro structure formed then the weld area has been dominated by acicular ferrite micro structure, grain boundary ferrite dominate in coarse HAZ, the pearlite and ferrite with grain aggrandizement take place in smooth HAZ and base metals.
Pengaruh Shot Peening Terhadap Kekerasan Dan Kekasaran Produk Chemical Milling Paduan Aluminium Yang Telah Di Stretching Yovial Mahyoedin; Jamasri Jamasri; Rizky Arman; Wenny Marthiana; Suryadima Suryadima
JURNAL KAJIAN TEKNIK MESIN Vol 5, No 1 (2020): Jurnal Kajian Teknik Mesin
Publisher : Universitas 17 Agustus 1945 Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (484.733 KB) | DOI: 10.52447/jktm.v5i1.2995

Abstract

AbstrakPenelitian ini bertujuan untuk mengetahui pengaruh shot peening terhadap kekasaran permukaan produk pembuatan kimia Al 2524-T3 dan Al 2024-T3 yang telah diregangkan. Paduan ini direntangkan melampaui tegangan luluh, yaitu masing-masing 1%, 3% dan 5%, dan kemudian dilakukan proses penggilingan kimia di satu sisi. Etching yang digunakan dalam proses penggilingan kimia adalah larutan NaOH + Na2S + H2O dengan konsentrasi tertentu. Permukaan dilakukan proses shot peening dengan intensitas yang bervariasi masing-masing 0,03 A, 0,05 A dan 0,07 A. Bahan itu kemudian diuji kekasaran permukaan dan kekerasannya. Hasil penelitian menunjukkan bahwa kekasaran permukaan dan kekerasan material meningkat dengan meningkatnya intensitas peening. Namun, ketebalan Al 2524-T3, yang lebih tipis dari Al 2024-T3 menyebabkan tidak signifikannya proses peening shot yang diberikan pada material.. Kata kunci: Shot Peening, Chemical Milling, Kekerasan, Kekasaran Permukaan AbstractThis study aims to investigate the influence of shot peening on hardness and surface roughness of chemical mlling product Al 2524-T3 and Al 2024-T3 which have been stretched. These alloys were stretched beyond yield stress, namely 1%, 3% and 5% of each, and then performed chemical milling process of one side. The etching used in chemical milling process were NaOH+Na2S+H2O solutions with certain concentration. The surface was performed shot peening process with varying intensity of 0.03 A, 0.05 A and 0.07 A respectively. The material were then tested its surface roughness and hardness. The results show that surface roughness and hardness of material increases with the increase of peening intensity. However, the thickness of Al 2524–T3, which is thinner than Al 2024-T3 causing insignificance of the shot peening process given to the materials. Keywords: Shot Peening, Chemical Milling, Hardness, Surface Roughness
Kekuatan Tarik Paduan Al 2024-T3 Dan Al 2524-T3 Yang Telah Mengalami Proses Stretching, Chemical Milling Dan Shot Peening Yovial Mahyoedin; Jamasri Jamasri; Wenny Marthiana; Duskiardi Duskiardi; Rizky Arman
JURNAL KAJIAN TEKNIK MESIN Vol 5, No 2 (2020): JURNAL KAJIAN TEKNIK MESIN
Publisher : Universitas 17 Agustus 1945 Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52447/jktm.v5i2.4213

Abstract

AbstrakPenelitian ini bertujuan untuk mengetahui perilaku uji tarik produk Al 2524-T3 dan Al 2024-T3 yang mengalami proses peregangan, chemical milling dan shot peening. Paduan ini diregangkan melebihi tegangan yeildnya masing-masing 1%, 3% dan 5%, kemudian dilakukan proses chemical milling satu sisi. Etsa yang digunakan dalam proses milling kimia adalah larutan NaOH + Na2S + H2O dengan konsentrasi tertentu. Pada permukaan dilakukan proses shot peening dengan variasi intensitas masing-masing 0,03 A, 0,05 A dan 0,07 A. Material tersebut kemudian diuji sifat mekaniknya dengan uji tarik. Hasil penelitian menunjukkan bahwa tegangan ultimate dan tegangan yield material meningkat dengan meningkatnya persentase regangan. Namun, perpanjangan juga meningkat yang menunjukkan bahwa proses peregangan justru meningkatkan keuletan. Di sisi lain, proses shot peening menurunkan elongasi yang mengindikasikan bahwa proses shot peening menyebabkan penurunan keuletan material. Kata kunci: pengujian tarik, chemical milling, shot peening, stretchingAbstractThis study aims to investigate the tensile test behaviour of Al 2524-T3 and Al 2024-T3 product, which undergoes stretching, chemical milling and shot peening processes. These alloys were stretched beyond yield stress, namely 1%, 3% and 5% of each, and then performed chemical milling process of one side. The etching used in chemical milling process were NaOH+Na2S+H2O solutions with certain concentration. The surface was performed shot peening process with varying intensity of 0.03 A, 0.05 A and 0.07 A respectively. The material then tested its mechanical properties by tensile test. The results show that ultimate and yield stress of material increases with the increase of stretching percentage. However, the elongation has also increased which indicates that stretching process actually increases the ductility. On the other hand, the shot peening process decreases the elongation which indicates that the shot peening process causes a reduction in the ductility of the material.  Keywords: tensile tes, chemical milling, shot peening, stretching
Perilaku water absorption pada komposit hybrid serat agel tenun dan serat gelas H. Hestiawan; J. Jamasri; K. Kusmono; A. Puspawan
Dinamika Teknik Mesin Vol 11, No 2 (2021): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (459.641 KB) | DOI: 10.29303/dtm.v11i2.457

Abstract

This study aimed to investigate the effect of alkali treatment and stacking sequences on water absorption and flexural strength in woven agel and glass fibers reinforced hybrid composites. The research materials are woven agel fiber, E-200 glass fiber, unsaturated polyester resin Yukalac 157 BQTN, and catalyst of methyl ethyl ketone peroxide (MEKP). The alkali treatment is carried out on the woven agel fibers by soaking the fiber in 5% NaOH solution for 1 hour. Then the fiber is washed with fresh water and dried for 48 hours. Manufacturing techniques used vacuum bagging with suction pressure of 70 cmHg at room temperature. The amount of reinforcing fiber 7 fibers consists of 3 glass fibers and 4 agel woven fibers. The water absorption test uses a 3.5% NaCl solution for 1080 hours at room temperature. Water absorption test specimens based on ASTM D570 standard. The research results showed that alkali treatment with glass fiber arrangement on the specimen surface effectively decreased water absorption and increased the flexural strength of woven agel and glass fibers hybrid composites. This can be seen from the decrease in water content in equilibrium by 8.67%, the diffusion coefficient of 5.74 x 10-12 m2/s, and the flexural strength before and after immersion, which are 135 MPa and 125 MPa respectively.
Pengaruh Perlakuan Alkali-silan terhadap Sifat Mekanis Komposit Hibrid yang Diperkuat Serat Agel dan Serat Gelas : Effect of Alkali-Silane Treatment on Mechanical Properties at Glass Fabric and Woven Agel (Corypha gebanga) Reinforced Hybrid Composites Hendri Hestiawan; Jamasri; Kusmono
Jurnal Metalurgi dan Material Indonesia Vol. 3 No. 1 (2020): April
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The aim of this research is to investigate the effect of alkali-silane on mechanical properties at glass fabric and woven agel (Corypha gebanga) reinforced hybrid composites. The materials used are woven agel fiber, glass fabric, unsaturated polyester resin of yukalac 157 BQTN, and catalyst of methyl ethyl ketone peroxide. Manufacturing techniques used vacuum bagging with a suction pressure of 70 cmHg at room temperature. The woven agel were treated with 4% sodium hydoxide solution for 1 hour, 5% silane solution for 3 hours, and a combined sodium hydoxide and silane solution. The tensile, flexural, and impact test specimens based on ASTM D 638-02, D 790-02, and D 5942-96 standards respectively. The results of tensile, flexural, and impact tests showed that the highest tensile and flexural strength, and impact toughness ​​were obtained on alkali-silane treated hybrid composites, i.e. 78 MPa, 116 MPa, and 38 kJ/m2 respectively. It can be concluded that the alkali-silane treatment effectively improves the mechanical properties of at glass fabric and woven agel reinforced hybrid composites
Water absorption of polyester resin polymer composite reinforced woven agel fiber (Corypha gebanga) in various solution Hendri Hestiawan; Jamasri Jamasri; Kusmono Kusmono
Jurnal Teknik Mesin Indonesia Vol 15 No 1 (2020): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v15i1.147

Abstract

Kajian ini bertujuan untuk mengetahui penyerapan air pada komposit resin poliester berpenguat serat agel tenun (Corypha gebanga) yang direndam dalam air distilasi dan larutan 3,5% NaCl. Bahan yang digunakan adalah serat agel tenun, resin poliester tak jenuh Yukalac 157 BQTN, dan katalis metil etil keton peroksida (MEKP). Teknik pembuatannya menggunakan vacuum bagging dengan tekanan hisap 70 cmHg pada suhu ruangan. Spesimen uji penyerapan air berdasarkan standar ASTM D570 selama 1080 jam pada suhu kamar. Hasil uji penyerapan air menunjukkan bahwa komposit resin poliester berpenguat serat agel tenun yang direndam dalam air distilasi memiliki kemampuan menyerap air dan koefisien difusi yang lebih tinggi daripada yang direndam dalam larutan 3,5% NaCl. Hal ini menunjukkan bahwa tingkat viskositas larutan mempengaruhi penyerapan air dan difusi.
Co-Authors A. E Tontowi A. Puspawan Alva Edy Tontowi Alva Edy Tontowi Alva Tontowi Alva Tontowi, Alva Aris Budiyono Budi Rochardjo, Heru Santosa Dawal, Siti Zawiah Md. Dawal, Siti Zawiah Md. Duskiardi Duskiardi Gunesti Wahyu Handiko H. Hestiawan H. S Rochardjo Hendri Hestiawan Hendri Hestiawan Heru Santoso Budi Rochardjo Heru Santoso Budi Rochardjo, Heru Santoso Heru Santoso Budi Rochardjo, Heru Santoso Budi Iswanto, P.T. Iswanto, P.T. Khasanah, Rahayu Kuncoro Diharjo Kusmono Kusnanto Kusnanto Kusnanto Kusnanto M. Waziz Wildan M.N. Ilman M.N. Ilman, M.N. M.W. Wildan M.W. Wildan Mastariyanto Perdana Nur Subeki Orisanto Darma Setiawan R. Soekrisno Riyadi, S Rizky Arman Rochardjo, H. S S Riyadi S. A Widyanto Slamet Widyanto Slamet Widyanto, Slamet Subarmono Subarmono Subarmono Subarmono Sugiarto Sugiarto Suryadima Suryadima Susilo Adi Widyanto Susilo Widyanto Susilo Widyanto, Susilo Sutiarso Sutiarso Tjuk Oerbandono Tontowi, A. E Triyono Triyono Wenny Marthiana Widyanto, S. A Widyanto, Slamet A. Yovial Mahyoedin