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PENGARUH PENAMBAHAN LIMBAH PLASTIK BEKAS TERHADAP KARAKTERISTIK KEKUATAN TARIK DAN KEKUATAN BENDING MATERIAL POLIMER KOMERSIL Sujita, S.; Hadi, S. Gunawan
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 5, No 1 (2015): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.002 KB)

Polyester, epoxy and polyurethane composites are widely used for the matrix. The use of composite materials in the manufacturing industry as well as many studies of composites by utilizing plastic powder and the lack of studies directly comparing the tensile strength and bending properties of composite plastic powder to the treatment of the same fiber. The purpose of this study was to determine the tensile and bending strength of the composite material of polyester, epoxy, and polyurethane with reinforcing plastic powder by varying the volume fraction. In this study, the material used is plastic powder, with a size of 8 mm and the preparation of chopped random fibers, with a fiber volume fraction (0% / 100%, 5% / 95%, 10% / 90%, 20% / 80%, 30 % / 70%, 40% / 60, 50% / 50%, 60% / 40%, and 70% / 30%), using polyester resin, epoxy, and polyurethane as matriknya. Comparison of epoxy resin and polyurethane that is one to one, while for polyester using the catalyst of 2%. Tensile testing with ASTM D 3039, and bending test were conducted with ASTM D 790. The results of tensile testing tensile strength values obtained by variation of the highest volume fraction of 0% is owned by a composite plastic powder with 100% polyester resin with a value of 35.22 MPa, followed by a variation of the volume fraction of the composite with 0% plastic powder with 100% epoxy resin with the strength values pull of 6.40 MPa. While bending test results obtained the highest bending strength values held by the variation of volume fraction of the composite 0% plastic powder with 100% polyester resin with a value of 66.985 MPa, then successively followed by the composite with the highest volume fraction variation possessed by 30% of composite powders plastic with 70% epoxy resin with a value of 42.078 MPa bending strength, for a volume fraction of 50% variation of plastic powder with 50% polyurethane resin to obtain the highest value of bending strength of 6.963 MPa.

Characteristics of ASTM A36 steel mechanical properties in pack carburizing with carburizing agent coconut shell charcoal and goat bone powder mixed Sujita, S.; Okariawan, I.D.K.; Hakim, L.
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 13, No 1 (2023): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v13i1.619

In the study the specimens were ASTM A36 low carbon steel pack carburizing at 950℃, soaking time variations of 1, 2 and 3 hours. The carburizing agent is a mixture of coconut shell charcoal and goat bone powder (Capra aegagrus hircus). The size of the powder is 100 mesh, with variations in weight percentage between goat bone powder and coconut shell charcoal: 10%:90%, 20% : 80%, and 30% : 70%. Furthermore, the impact test, hardness, microstructure test and composition test were carried out, to determine the mechanical properties of the specimens. The results of the study show, soaking time and the composition of the carburizing agent affect the mechanical properties of the specimen The lowest impact toughness of 0,0576 joules/mm2 was obtained by the specimen at a soaking time of 1 hour, the composition of the carburizing agent (% wt goat bone powder: coconut shell charcoal) 20% : 80%. The highest surface hardness value was 854.734 Kg/mm2 at 3 hours soaking time with 10%:90% carburizing media composition. The results of microstructure observations showed that in specimens treated with pack carburizing ferrite structure, pearlite turned into martensite.

Penyuluhan Pemasangan Flow Dan Pressure Switch Pompa Di Perumahan Griya Praja Asri Sujita, Sujita; Padmiatmi, Pandri; Zainuri, Ahmad
JURNAL KARYA PENGABDIAN Vol. 7 No. 1 (2025): April, Jurnal Karya Pengabdian
Publisher : Jurusan Teknik Mesin FT Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jkp.v7i1.213

Warga perumahan Griya Praja Asri sebagian besar masih menggunakan air sumur untuk mandi, mencuci pakaian, mencuci kendaraan dan menyiram taman. Untuk menaikkan atau mengalirkan air dari sumur biasa menggunakan pompa berbagai merk, yang biasa dipakai pompa merk Shimizu. Untuk menghemat energy listrik penggunaan pompa, dilengkapi dengan pressure switch. Tujuannya agar pompa bisa mati secara otomatis jika air tidak digunakan atau semua kran air pada posisi menutup. Pada kenyataannya pengoperasian pompa dengan kontrol pressure switch, mempunyai beberapa kelemahan/kekurangan. Pada saat kran tidak dibuka penuh, ada saluaran air, pipa yang bocor sering menimbulkan bunyi cetak cetek, yang sangat mengganggu, terutama pada malam hari pada saat jam istirahat dan juga berdampak pada peningkatkan penggunaan energy listrik. Tujuan pengabdian masyarakat memecahkan permasalahan tersebut dengan metode penyuluhan dan praktek langsung penggunaan flow switch pada pompa yang punya control otomatis pressure switch. Hasil kegiatan masyarakat khalayak sasaran merasa puas karena masalah timbulnya bunyi cetak cetek pada saat pengguaan pompa bias teratasi. Kata kunci: pompa, pressure switch, flow switch

APLIKASI COMBINE HARVESTER DI KELOMPAK TANI DESA GEGELANG KECAMATAN LINGSAR KABUPATEN LOMBOK BARAT Sujita, Sujita; Zaiunuri, Ahmad; Sutanto, Rudy; Padmiatmi, Pandri
Jurnal Abdi Insani Vol 12 No 6 (2025): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v12i6.2511

Sentra penghasil padi di Provinsi Nusa Tenggara Barat adalah Desa Gegelang, Kecamatan Lingsar, Lombok Barat. Prestasi produktivitas padi di Lombok Barat sebagaimana dihasilkan oleh petani Desa Gegelang dalam satu satuan hektarnya bisa mencapai 10, 56 ton/hektar gabah basah, atau setara dengan 8,6 ton/hektar kondisi gabah kering giling. Sementara dengan hasil tersebut Lombok Barat dimungkinkan bisa meningkatkan produksi lebih dari capaian yang ada saat ini, jika melakukan mekanisasi pertanian. Kendala yang dihadapi sekarang para petani di daerah tersebut, memanen padi masih dengan cara manual, mengandalkan tenaga para buruh tani. Prosentase gabah yang terbuang tinggi. Saat pemotongan menggunakan sabit, sering kali bulir padi rontok dan jatuh ke tanah, apalagi jika padi sudah terlalu matang. Gabah juga tersisa di lahan. Potongan yang terlalu tinggi menyebabkan banyak bulir tertinggal di batang bawah. Gabah juga mengalami kerusakan fisik/bulir patah atau pecah, yang disebabkan oleh gesekan dan tekanan saat pengangkutan manual. Untuk mengatasi kondisi tersebut dilakukan penyuluhan dan penggunaan combine harvester (mesin panen padi multifungsi) di kelompok tani Desa Gegelang. Hasil dari kegiatan tersebut sangat berdampak pada kualitas dan kuantitas produksi gabah yang dihasilkan. Dengan menggunakan combine harvester jumlah tenaga kerja yang digunakan lebih sedikit sekitar 3 orang, dibandingkan dengan manual memerlukan tenaga kerja 20 orang. Kecepatan panen lebih cepat, 10 hektar/hari, dengan manual hanya 1.5 hektar/hari. Kesimpulannya penggunaan combine harvester lebih menguntungkan ditinjau dari penggunaan tenaga kerja, biaya operasional dan kualitas gabah lebih baik.

The effect cooling media in pack carburizing quenching on the corrosion resistance of ASTM A36 steel Sujita, S.; Padmiatmi, P.; Zainuri, A.; Sutanto, R.
Dinamika Teknik Mesin Vol 15, No 2 (2025): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v15i2.1099

Rotary plow on hand tractor functions as a tool to plow the land efficiently in agricultural mechanization. This tool is made of ASTM A36 steel which functions to cut, chop, and turn the soil, thus improving the soil structure and preparing the land for planting. The disadvantages of ASTM A36 steel are low impact toughness and corrosion resistance. In this study, ASTM A36 steel was pack carburizing quenching, with variations in cooling media in the form of water, coconut oil , and SAE 40 oil. The results of the studythe use of coconut oil as a cooling medium in the pack carburizing quenching process of ASTM A36 steel cause lower corrosion rates, slower cooling rates so that energy and impact toughness are higher compared to water as a cooling media So that coconut oil as a cooling media can be applied to the pack carburizing quenching rotary plow process to increase corrosion resistance.

Improving the surface hardness number of subsoil plow chisel using water-jet preening Sujita, S.
Dinamika Teknik Mesin Vol 9, No 2 (2019): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v9i2.280

This study discusses the effects of pressure in waterjet peening (WJP) of subsoil plow chise. It was made from austenitic stainless steel 301 JIS standard S30100. Analysis of surface integrity and change of surface hardness number is used to evaluate the performance of various parameters in the WJP process. The article summarizes information about austenitic stainless steel physically-mechanical of subsoil plow chisel that is most useful for soil tillage. The subsoil chisel was given surface treatment WJP process with a variation of pressure and time. The physical properties of subsoil plow chisel from various pressure and time of WJP are analyzed. The findings of this study indicated that surface treatment with waterjet peening could increase the surface hardness number and the hardening layer fromaustenitic stainless steel 301 (material of subsoil plow chisel).Treats the surface with WJP pressure 250 MPa and time 3 hours results in a higher increase in surface hardness number up to 41% and 151% greater than the raw material respectively. Also, a deeper hardening layer to depth 250 and 500 μm each produced. Next, the cross-sectional micro structure shows the density is higher than the slip band in the defective grain of specimens that have undergone the WJP process at the time and higher pressure. However, the number of slip bands in grain defects decreases with the pressure drop.

PEMANFAATAN SERBUK TEMPURUNG KELAPA PADA KOMPOSIT Al2O3-EPOXY Syafruddin Zohri, Ahmad; Sari, Nasmi Herlina; Sujita, S.
Dinamika Teknik Mesin Vol 3, No 2 (2013): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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The purpose of this research is utilization of coconut shell powder on Al2O3-Epoxy composite so it can be used as an alternative material of brake linings that are enviromentlly friendly. In this research, coconut shell powder is used as a filler on Al2O3-Epoxy composites that are made using hand lay up method. Comparison volume fraction of coconut shell powder and Al2O3 was varied amount 0:40, 10:30, 20:20, 30:10 and 40:0 (%). Adhesive was used is epoxy resin namely amount 60%. Test conducted is wear test. The results showed that utilization of coconut shell powder on Al2O3-Epoxy can be decrease the wear so it can be used as an alternative material of brake linings that are environmentally friendly

Karakterisasi polyester komposit berpenguat serat pohon pisang saba dengan filler carboxyl terminated butadiene acrylonitryle sebagai material bumper otomotif Sujita, S.; Sulistyowati, E. D.; Zainuri, A.; Sinarep, S.; Pandiatmi, P.
Dinamika Teknik Mesin Vol 12, No 2 (2022): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v12i2.525

The bumper is one part of the vehicle that has a very important role. In addition to functioning as aerodynamics and aesthetics to attract consumers, the bumper also functions as a damper and a buffer against impact (shock/impact force) in the event of an accident. Therefore, the material used as the bumper, especially the rear bumper, is often damaged, so a material that has good tensile strength and impact toughness is needed. In this research, the object of the research is the polyester matrix composite. The research aspect is more emphasized on the effect of using Musa acuminata stem fiber (MASF) as a reinforcement and filler of Carboxyl Terminated Butadiene Acrylonitryle (CTBN) on changes in tensile strength and impact toughness. The results of the study show. the addition of MASF volume fraction and CTBN filler increased the tensile strain, impact toughness, impact energy, but decreased the tensile strength of the polyester matrix composite material. The change in mechanical properties is due to the bonding of MASF with CTBN and polyester with CTBN, so that the impact toughness and ductility of the specimen increases, because CTBN is elastic.

Pengaruh media pendingin dan waktu pada perlakuan pack carburizing-quenching baja karbon rendah SS400 Sujita, S.; Yudhyadi, I.G.N.K.; Zainuri, A.; Adhi, I.G.A.K.C.; Sutanto, R.
Dinamika Teknik Mesin Vol 11, No 2 (2021): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v11i2.471

The SS400 low carbon steel is widely used in the agricultural equipment industry because of its specific properties, malleability good corrosion resistance, and high strength to weight ratio. However, according to several research results it has several weaknesses, low surface hardness, ductility and wear resistance. Therefore, it is necessary to improve its mechanical properties so that the agricultural equipment products produced are of better quality. The purpose of this study was to determine the effect of variations in time and cooling media in the pack carburizing-quenching treatment of SS400 steel specimens. The pack carburizing treatment was carried out at a temperature of 875 ºC, 90 minutes, the carburizing medium was a mixture of corncob charcoal powder and Picntada maxima shell powder, with a composition of 70%: 30%, followed by a quenching process with variations in time (1, 2, 3, 4). minutes) and cooling medium (water, oil SAE 40, cane molasses 10% and cane molasses 30%. The results of the study showed that the time and cooling medium affected the surface hardness, ductility and microstructure of the specimens With 30% cane molasses cooling medium, quenching time of 4 minutes, the largest specimen absorbed impact energy (toughness) is 2.23 J/mm2. On the other hand, the lowest surface hardness number is 285 Kg/mm2.The increased ductility causes the cracking marks to disappear on the specimen surface. Based on observations with SEM, there is a decomposition of the martensite structure with coarser grain sizes.

PENGARUH PENAMBAHAN LIMBAH PLASTIK BEKAS TERHADAP KARAKTERISTIK KEKUATAN TARIK DAN KEKUATAN BENDING MATERIAL POLIMER KOMERSIL Sujita, S.; Hadi, S. Gunawan
Dinamika Teknik Mesin Vol 5, No 1 (2015): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

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

Polyester, epoxy and polyurethane composites are widely used for the matrix. The use of composite materials in the manufacturing industry as well as many studies of composites by utilizing plastic powder and the lack of studies directly comparing the tensile strength and bending properties of composite plastic powder to the treatment of the same fiber. The purpose of this study was to determine the tensile and bending strength of the composite material of polyester, epoxy, and polyurethane with reinforcing plastic powder by varying the volume fraction. In this study, the material used is plastic powder, with a size of 8 mm and the preparation of chopped random fibers, with a fiber volume fraction (0% / 100%, 5% / 95%, 10% / 90%, 20% / 80%, 30 % / 70%, 40% / 60, 50% / 50%, 60% / 40%, and 70% / 30%), using polyester resin, epoxy, and polyurethane as matriknya. Comparison of epoxy resin and polyurethane that is one to one, while for polyester using the catalyst of 2%. Tensile testing with ASTM D 3039, and bending test were conducted with ASTM D 790. The results of tensile testing tensile strength values obtained by variation of the highest volume fraction of 0% is owned by a composite plastic powder with 100% polyester resin with a value of 35.22 MPa, followed by a variation of the volume fraction of the composite with 0% plastic powder with 100% epoxy resin with the strength values pull of 6.40 MPa. While bending test results obtained the highest bending strength values held by the variation of volume fraction of the composite 0% plastic powder with 100% polyester resin with a value of 66.985 MPa, then successively followed by the composite with the highest volume fraction variation possessed by 30% of composite powders plastic with 70% epoxy resin with a value of 42.078 MPa bending strength, for a volume fraction of 50% variation of plastic powder with 50% polyurethane resin to obtain the highest value of bending strength of 6.963 MPa.

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