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All Journal TEKNIK Jurnal Simetris Rekayasa Mesin Science and Technology Indonesia Mekanika: Majalah Ilmiah Mekanika SEMAR Abdi Masya Prosiding SNTTM
Wijang Wisnu Raharjo
2Jurusan Teknik Mesin, FT.Universitas Sebelas Maret,Surakarta Jl., Ir., Sutami 36A Surakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Effect of Screw Rotation Speed on Mechanical Properties and Morphology of Abs/Mcc Composites Adhana, Irvian; Smaradhana, Dharu Feby; Ariawan, Dody; Raharjo, Wijang Wisnu; Yusuf, Burhanuddin
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i1.70884

Abstract

Acrylonitrile Butadiene Styrene (ABS) polymer can be modified to increase strength against resistance, toughness, and heat resistance by adding Microcrystalline Cellulose (MCC) as a reinforcement to ABS composites. Extrusion is one of the established methods of polymer processing with filler and consequently disperses filler inside the polymer. Different speed shows different behaviour of filler dispersion. Therefore, this study was conducted to know the effect of extruder screw speed variations on the mechanical, physical, and thermal stability of ABS/MCC composites. The compositions used in producing ABS/MCC composites were 96% for ABS and 4% for MCC. The production process used screw extruder speed variations of 10 rpm, 15 rpm, and 20 rpm. ABS/MCC composite in the barrel and hot press used 160 °C for the temperature process. The highest tensile strength was obtained at 10 rpm variation for 14.2 MPa. Increasing the speed of the extruder screw caused a decrease in MCC content attached to ABS which reduced the mechanical strength. ABS/MCC composite density value decreased with the increased extruder speed, as evidenced by the increasing number of voids formed based on Scanning Electron Microscopy (SEM) testing.
Effect of Heating Temperature on Wear Rate, Tensile Strength, and Crystallinity of Cantula Fiber-Reinforced Magnesium/Hydroxyapatite/ Shellac for Bone Screw Material Maulana, Zufar; Triyono, Joko; Raharjo, Wijang Wisnu
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i1.71171

Abstract

Bone screws are commonly used together with support plates to stabilize fractured bones. Conventional bone screws are typically made from metals such as stainless steel and titanium due to their superior mechanical properties. However, the use of permanent metallic implants often requires a secondary surgical procedure for removal after the bone has healed. Therefore, recent research has focused on developing biodegradable biomaterials that can gradually degrade within the body, eliminating the need for implant removal. This study investigated the effect of heating temperature on the tensile strength, wear rate, and crystallinity of a magnesium/nano-hydroxyapatite (nano-HA)/shellac/cantala fiber biocomposite. The composite materials were mixed using a blender with a volume ratio of magnesium/nano-HA–shellac/cantala fiber of 50/20/30 and then compacted at a pressure of 300 MPa for 10 minutes. Heat treatment was conducted at temperatures of 100 °C, 120 °C, 140 °C, and 160 °C for two hours. The results showed that the lowest wear rate (0.72 × 10⁻³ mm³/Nm), the highest tensile strength (6.58 MPa), and the highest crystallinity (74.15%) obtained from X-ray diffraction (XRD) analysis were all achieved at a heating temperature of 160 °C, indicating that higher heating temperatures improved the mechanical and structural properties of the biocomposite.
Peningkatan Potensi Wisata dengan Pemasangan Outdoor Fitness sebagai Upaya Peningkatan Kesehatan Masyarakat di Desa Karangasem Kab. Sukoharjo Raharjo, Wijang Wisnu; Diharjo, Kuncoro; Ariawan, Dody; Raharjo, Wahyu Purwo; Kusharjanta, Bambang; Ubaidillah, U
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 12, No 1 (2023): Mei
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v12i1.45314

Abstract

Jumlah usia muda yang tinggi perlu diberikan pembinaan fisik dan mental agar menjadi sumber daya manusia yang berkualitas di masa mendatang. Warga berusia muda di desa yang sudah mendapat informasi secara mudah juga memerlukan sarana olah raga fitnes yang tidak jauh dari tempat tinggal mereka. Alat ini akan memberika kesempatan kepada para pemuda untuk membentuk kesegaran jasmaninya dan berinteraksi sosial. Konsep itu dituangkan dalam bentuka pengembangan taman dan alat fitness outdoor sebagai alat kesehatan/pembinaan fisik masyarakat. Alat fitness yang dipasang pada ruang terbuka dapat dimanfaatkan masyarakat untuk berolahraga dan berwisata di satu objek wisata yang sedang dikembangkan. Dengan adanya kegiatan ini diharapkan masyarakat secara tidak sadar mulai kembali bergerak secara fisik dan menyadari pentingnya berolahraga selain itu juga penyegaran jiwa melalui kegiatan wisata alam. Dengan naiknya minat berolahraga dan menekan tingkat kejenuhan diharapkan akan membentuk sumber daya manusia dengan kualitas fisik dan mental yang tinggi. Teknik Mesin, Fakultas Teknik, Universitas Sebelas Maret menghadirkan solusi dengan menyumbangkan alat out door fitness yang diharapkan dapat meningkatkan animo kehadiran masyarakat di area pariwisata Gunung Pegat. Alat yang dipasang berjenis self actuation dengan memanfaatkan beban badan sendiri. Alat ini melatih otot lengan dan perut karena kontraksi utama pada area tersebut. Setelah pemasangan alat tersebut, masyarakat antusias memanfaatkan alat – alat yang dipasang.Kata kunci :  Kesehatan; masyarakat;  olah raga;  out door; interaksi, sosial.
Co-Authors Adhana, Irvian Archi Kun Cahyo Utomo Arif Setyo Nugroho Bambang Kusharjanta Burhanuddin Yusuf, Burhanuddin Dikky Kusuma Wijaya Dody Ariawan Fitrian Imaduddin Imaduddin, Fitrian Jihad, Bagus H. Joko Triyono Kuncoro Diharjo Lasinta Ari Nendra Wibawa Maulana, Zufar Muhammad Luthfi Ridwan, Ridwan Saputri, Dini Deviana Sastra, Palgunadi Smaradhana, Dharu Feby Teguh Endah Saraswati Teguh Triyono Tritjahjono, Rachmad Imbang Triyono Ubaidillah Ubaidillah Ubaidillah, U Utami, Dea Pawestry Wahyu Purwo Raharjo Wibowo Wullandari, Putri Yossa Aulia, Ardhana