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Nani dkk. Mulyaningsih
Jurusan Teknik Mesin, Program Studi Teknik Mesin, Universitas Tidar, Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Evaluasi Sifat Tampak dan Dimensi Paving block dengan Pengaruh Waktu Pemanasan Limbah Plastik Ldpe dan Multilayer untuk Aplikasi Eksternal Imam Agus Wahyudi; Nani Mulyaningsih; Nila Nurlina
J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Vol. 10 No. 2 (2026): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v10i2.4384

Abstract

Limbah plastik menjadi masalah pencemaran lingkungan yang serius seiring dengan pertumbuhan penduduk. Penggunaan plastik sekali pakai meningkat secara signifikan menyebabkan penurunan kesuburan dan menghambat penyerapan air pada tanah, terutama plastik LDPE dan multilayer. Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi waktu pemanasan terhadap sifat tampak dan dimensi paving block limbah plastik LDPE dan multilayer. Limbah plastik digunakan sebagai bahan pengikat dalam pembuatan paving block ramah lingkungan untuk aplikasi eksternal. Variasi waktu pemanasan yang digunakan adalah 30, 40, dan 50 menit, dengan pengujian sifat tampak dan dimensi sesuai standar SNI 03-0691-1996. Hasil pengujian menunjukkan bahwa seluruh spesimen memenuhi persyaratan fisik sifat tampak menunjukkan permukaan rata, tanpa retak, serta sudut tidak mudah dirapuhkan. Dimensi rata-rata seluruh spesimen juga memenuhi standar ketebalan minimum 60 mm dengan toleransi +8%. Dengan demikian, peningkatan waktu pemanasan berpengaruh terhadap kualitas visual permukaan dan campuran yang homogen, serta seluruh variasi dinyatakan layak untuk aplikasi eksternal.
Analisis Pengaruh Temperatur terhadap Dimensi dan Daya Serap Material Paving Block dari Limbah Plastik LDPE dan Multilayer Aluminium Hanafi Izzul Kurniawan; Nani Mulyaningsih; Nila Nurlina
J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Vol. 10 No. 2 (2026): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v10i2.4386

Abstract

Berdasarkan data dari SIPSN tahun 2024, timbunan sampah nasional mencapai 33,82 juta ton per tahun, dengan 19,78% merupakan sampah plastik. Jenis plastik LDPE (Low Density Polyethylene) dan multilayer terus meningkat setiap tahunnya serta merupakan material yang sulit terurai dimana degradasi plastik dengan cara penimbunan memakan waktu yang sangat lassma hingga puluhan tahun. Salah satu pemanfaatan limbah plastik sebagai material alternatif untuk pembuatan paving block. Penelitian ini bertujuan untuk menganalisis pengaruh temperatur terhadap dimensi dan daya serap air material paving block dari limbah LDPE dan multilayer aluminium. Variasi temperatur pelelehan LDPE 200⁰C, 220⁰C dan 240⁰C dan temperatur pelelehan multilayer 450⁰C dengan komposisi yang digunakan adalah 45% LDPE; 5% multilayer; 5% abu; 45% pasir. Hasil menunjukkan bahwa seluruh spesimen memenuhi standar dimensi, dengan ketebalan rata-rata berada dalam batas toleransi +8%. Nilai daya serap air paling rendah berada pada variasi temperatur 200°C sebesar 0,314% yang sesuai spesifikasi SNI 03-0691-1996 untuk mutu A.
Kekuatan Mekanik Komposit Hybrid Berpenguat Serat Daun Lidah Mertua – Carbon Fiber untuk Aplikasi Spakbor Sepeda Motor nur afiyan; Nani Mulyaningsih; R. Faiz Listyanda
J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Vol. 10 No. 2 (2026): J-Proteksion
Publisher : Universitas Muhammadiyah Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32528/jp.v10i2.4566

Abstract

Pengembangan material ringan dan kuat untuk aplikasi otomotif perlu dikembangkan, komposit hybrid berbasis serat daun lidah mertua dan carbon fiber yang disusun dalam beberapa konfigurasi layer. Kajian teori mencakup karakteristik komposit, sifat serat lidah mertua dan carbon fiber, perlakuan alkali NaOH 5%, serta standar uji mekanik ASTM D 6110. Penelitian dilakukan secara eksperimental melalui proses perendaman dan persiapan serat, pembuatan komposit menggunakan metode hand lay-up, serta pengujian impak di laboratorium. Pengumpulan data meliputi pengukuran dimensi spesimen, pencatatan nilai energi serap, serta analisis makro patahan. Hasil penelitian menunjukkan bahwa variasi susunan serat berpengaruh signifikan terhadap performa mekanik komposit, di mana konfigurasi L-K-K-L menghasilkan ketangguhan impak tertinggi sebesar 0,1420 J/mm², Analisis makro menunjukkan adanya cacat seperti void, fiber pull-out, dan matrix-rich yang memengaruhi mutu spesimen. Secara keseluruhan, kombinasi serat alam dan sintetis terbukti dapat meningkatkan kekuatan komposit apabila susunan layer diatur secara optimal.
Pengembangan Produk Meja dan Kursi Menggunakan Papan Komposit Sandwich Berbasis Material Lokal Sri Hastuti; Nani Mulyaningsih; Martha Arum Nugraheni; Agung Purnomo; Nurhadi; Catur Pramono; Setya Drana Harry Putra; Muktivani Swastiko; Tardho Hakim; Fajar Paundra
Aksiologiya: Jurnal Pengabdian Kepada Masyarakat Vol 10 No 2 (2026): Mei
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/aks.v10i2.28682

Abstract

Nilai daya jual rendah dan keberadaan serat sabut kelapa yang melimpah di pesisir laut terutama di daerah Klirong, Kebumen. Serat sabut kelapa digunakan pada beberapa produk industri kreatif seperti topi, tas, dan keset lantai. Kayu balsa banyak digunakan pada berbagai kebutuhan furnitur rumah karena memiliki massa yang ringan dan harga murah. Program Pengabdian Unggulan Universitas ini bertujuan untuk melakukan pendampingan warga  dalam pengembangan material serat sabut kelapa untuk pembuatan produk meja dan kursi menggunakan papan komposit sandwich yang berlokasi di Tuguran, Magelang Utara. Bahan komposit digunakan pada program  pengbadian ini yaitu serat sabut kelapa, kayu balsa, resin unsaturated polyester serta katalis. Rangka meja dan kursi menggunakan material baja hollow ST37. Metode pembuatan produk komposit sandwich berpenguat serat sabut kelapa fraksi volume serat 20% dengan core kayu balsa tebal 10 mm dibuat dengan metode cetak tekan menghasilkan energi serat 0,87 J dan ketangguhan impak 0,0176 J/mm². Perakitan rangka meja dan kursi menggunakan metode pengelasan Shielded Metal Arc Welding (SMAW) dengan arus 100 A. Hasil pembuatan produk menunjukkan bahwa komposit sandwich dengan metode cetak tekan menghasilkan papan komposit sandwich dengan sedikit void dan tidak terjadi delaminasi atau cacat. Pengelasan minim cacat pada parameter  arus 100 ampere, sehingga rangka kursi kuat menahan beban sampai 100 kg yang sudah diuji coba diduduki langsung oleh warga. Pendampingan pembuatan meja dan kursi komposit memberikan manfaat berupa kemampuan warga dalam soft skill dan hard skill dalam pembuatan produk meja dan kursi komposit sandwich yang memiliki daya jual dan kebermanfaatan tinggi.
Analysis of weld defects and corrosion rates in SS304–SS400 dissimilar joints under various MIG welding positions Yoggo Bagus Pamungkas; Nani Mulyaningsih; Sri Hastuti; R.Faiz Listyanda
Journal of Welding Technology Vol 8, No 1 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v8i1.8788

Abstract

The combination of SS304 stainless steel and SS400 low-carbon steel is widely used in the automotive and construction sectors because it combines weldability with good corrosion resistance. However, the differences in the physical and mechanical properties of these two materials have the potential to affect the quality of the welded joint, especially when considering variations in welding position. This study aims to analyze the effect of 1G, 2G, and 3G welding positions on welding defects and the corrosion rate of Metal Inert Gas (MIG) welded joints. The materials used were SS304 stainless steel plates and SS400 lowcarbon steel plates joined using a 60° V-groove. The welding process was performed using a current of 70 A as the primary parameter and ER309L electrode wire for all welding position variations. Welding defect testing was performed using the liquid penetrant method in accordance with ASTM E165 to detect surface defects, and corrosion rate testing was conducted using the electrochemical method in a NaCl solution, referencing ASTM G102 to determine the corrosion resistance of the welded joints. The test results showed that the 1G welding position produced the fewest welding defects compared to the 2G and 3G positions, and the 1G welding position yielded the lowest corrosion rate of 0.0789 mmpy, while the 2G and 3G positions showed corrosion rates of 0.1301 mmpy and 0.1699 mmpy, respectively. These values indicate that welded joints in the 1G position have better corrosion resistance compared to other positions. This difference is influenced by the stability of the weld pool, the effect of gravity, and the lower likelihood of weld defects in the 1G position. Thus, the welding position plays a crucial role in determining the quality and corrosion resistance of MIG weld joints in dissimilar materials, specifically SS304 stainless steel and carbon steel. SS400 low-carbon steel.
Pengaruh Variasi Jenis Anoda Korban terhadap Laju Korosi Pipa ASTM A53 pada Media Tanah Liat Rizal Rizal Akbar Mantofani; Nani Mulyaningsih; Adityo Noor S. Darmo
Jurnal Mesin Nusantara Vol 9 No 1 (2026): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v9i1.27019

Abstract

Korosi pada pipa baja ASTM A53 yang tertanam di dalam tanah dapat menurunkan umur pakai serta keandalan sistem perpipaan. Salah satu metode yang banyak digunakan untuk mengendalikan korosi adalah proteksi katodik menggunakan anoda korban. Penelitian ini bertujuan menganalisis pengaruh variasi jenis anoda korban, yaitu magnesium (Mg), aluminium (Al), dan seng (Zn), terhadap laju korosi pipa ASTM A53 pada media tanah liat. Pengujian dilakukan dengan metode polarisasi potensiodinamik mengacu pada ASTM G102 setelah spesimen dipendam selama 30 hari. Nilai laju korosi dihitung berdasarkan arus korosi (Icorr) yang diperoleh dari hasil pengujian. Hasil penelitian menunjukkan bahwa penggunaan anoda korban mampu menurunkan laju korosi dibandingkan spesimen tanpa proteksi. Anoda magnesium memberikan perlindungan paling efektif dengan laju korosi sebesar 0,3110 mmpy, atau menurunkan laju korosi sebesar 86,2% dibandingkan spesimen tanpa anoda yang memiliki laju korosi 2,2568 mmpy. Sementara itu, anoda aluminium dan seng juga mampu menurunkan laju korosi, namun efektivitasnya lebih rendah dibandingkan magnesium. Hasil penelitian menunjukkan bahwa pemilihan jenis anoda korban berpengaruh signifikan terhadap efektivitas proteksi katodik pada pipa ASTM A53 di lingkungan tanah liat, dengan magnesium sebagai material anoda yang memberikan kinerja perlindungan terbaik
Analysis of Wear Resistance in Eco-Friendly Paving Blocks Utilizing Multilayer Aluminum–LDPE Plastic Waste Nani Mulyaningsih; Sri Hastuti; Hanafi Izzul; Bagas Tri
Jurnal Rekayasa Mesin Vol. 21 No. 1 (2026): Volume 21, Nomor 1, April 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v21i1.7354

Abstract

The growing demand for sustainable construction materials has encouraged research on the utilization of multilayer aluminum plastic waste and low-density polyethylene (LDPE) waste as substitution materials in the production of paving blocks. This study emphasizes abrasion resistance as a key indicator of paving block quality. The waste materials were processed through melting and subsequently blended with fine aggregates of sand and combustion ash in varying compositions. The abrasion resistance value obtained was 0.0771 mm/min, which corresponded to the Class B quality standard as specified in SNI 03-0691-1996. The results demonstrate that incorporating multilayer aluminum plastic and LDPE waste at a proportion of 65% enhances the abrasion resistance of paving blocks compared to conventional ones. This improvement is attributed to the plasticity of LDPE, which increases flexibility and reduces microcracking, as well as the contribution of aluminum layers that provide greater resistance to friction. Further analysis suggests that paving blocks incorporating multilayer aluminum plastic and LDPE waste are suitable for use in residential roads, village pathways, and office yards subject to moderate vehicle traffic. These findings support the notion that integrating multilayer aluminum plastic waste into construction materials not only improves the technical performance of the product but also offers a strategic solution to reduce the accumulation of non-biodegradable waste.
Analisis Variasi Rapat Dan Tegangan Pada Proses Anodisasi Terhadap Kekerasan dan Ketahanan Aus Paduan Aluminium Muhammad Adrian Rizky; Nani Mulyaningsih; Fendy Kussuma Hadi Sufyan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.315

Abstract

Aluminum alloys are widely used in the automotive industry, particularly for radiators, due to their lightweight nature, good corrosion resistance, and excellent thermal conductivity. However, these materials remain vulnerable to wear from internal erosion and contamination, necessitating additional protection. This study investigates the effects of varying current density and voltage during anodizing on the hardness and wear resistance of 3xxx-series aluminum alloys. The process was carried out in a sulfuric acid (H₂SO₄) electrolyte for 40 minutes using currents of 4 A and 5 A, combined with voltages of 25 V and 35 V. Micro-Vickers testing revealed the highest hardness of 162.63 VHN at 4 A and 25 V, while the best wear resistance was achieved at 5 A and 35 V with a specific wear rate of 0.000302371 mm³/kg (an improvement of 24%).
Pengaruh Pelapisan Zinc Phosphate pada Baja Karbon ST42 terhadap Laju Korosi dan Ketahanan Aus Rio Candra Hermawan; Nani Mulyaningsih; M. Fendy Kussuma Hadi Sufyan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.348

Abstract

This study investigates the effect of zinc phosphate coating duration on the corrosion rate and wear resistance of ST42 steel for maritime applications. The experimental method involved immersion at 90°C with time variations ranging from 10 to 30 minutes. Corrosion rate testing utilized the potentiodynamic method (ASTM G102-89) in a 3.5% NaCl solution, while wear resistance was evaluated using the universal wear method (ASTM G99). The results indicate that the lowest corrosion rate occurred at a 30-minute coating duration (0.00678 mmpy), whereas the highest rate was at 10 minutes (0.08600 mmpy). Optimal wear resistance was observed at 20 minutes, yielding a value of 0.000642 mm³/kg·m. In conclusion, zinc phosphate coating effectively enhances the durability of ST42 steel against corrosive environments and mechanical friction. A 30-minute duration is recommended for maximum corrosion protection, providing a viable solution for extending the service life of maritime components such as anchor chains.
Effect of Sandblasting Pressure on Corrosion Rate and Adhesion Strength in the Coating Process Rizal Catur Prasetyo; Nani Mulyaningsih; Adityo Noor Setyo Hadi Darmo
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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

Abstract

Street lighting poles are an essential component of public street lighting (PSL) infrastructure and are commonly manufactured from low-carbon steel. However, this material is highly susceptible to corrosion if adequate surface protection is not provided. One of the most widely adopted protection methods is paint coating. Nevertheless, paint coatings remain vulnerable to mechanical damage, which may result in coating delamination and consequently reduce corrosion protection performance. Therefore, it is necessary to investigate process parameters that can improve coating adhesion while maintaining the corrosion resistance of the substrate. This study aims to evaluate the effect of sandblasting pressure on the corrosion rate and paint coating adhesion strength of low-carbon steel. Sandblasting was carried out at three pressure levels: 7, 8, and 9 bar. The corrosion behaviour was evaluated using the potentiodynamic polarisation method, while the coating adhesion strength was measured using a pull-off adhesion test. The results indicate that increasing the sandblasting pressure led to an increase in the corrosion rate. The specimen treated at 7 bar exhibited the lowest corrosion rate of 0.00428 mm/year, whereas the specimen treated at 8 bar showed the highest corrosion rate of 0.14998 mm/year. In contrast, higher sandblasting pressure improved the adhesion strength of the paint coating. The highest average adhesion strength of 2.73 MPa was obtained at 9 bar, while the lowest value of 2.28 MPa was recorded at 7 bar. These findings demonstrate that sandblasting pressure significantly influences the surface characteristics of low-carbon steel, thereby affecting both its corrosion behaviour and coating adhesion performance. The results provide useful insights for optimising surface preparation prior to painting and may contribute to improving the durability of protective coatings for street lighting applications.
Co-Authors Abdul Rahman Wahid Adityo Noor S. Darmo Adityo Noor Setyo Hadi Darmo Agung Purnomo Ahmad Subri Arizal Al Faiq, M Rauf Ari Wicaksono Arief Prasetyo Arif Rahman Saleh Auliadi, Diwa Lingga Ayub Adi Darmawan Aziz , Syahrul Fatchul Bagas Tri Bagas Tri Suryanto Budiono, Herru Santosa Cahya Ramadani, Pradipta Ihza Catur Pramono Choirul, Choirul Faisal Arif Riza Majid Fajar Paundra Fendy Kussuma Hadi Sufyan Fuad Hilmy Gilang Fitra Sanubari Gyani Ubaydillah Hadyan Hadyan Hanafi Izzul Hanafi Izzul Kurniawan Hanung Hermawan Hasan Zuhdi Hasugian, Panca Putra Hidayat, Ilyas Huda, Dimas Nur Amirul Ida Ayu Putu Sri Widnyani Iftitah, Siti Nurul Imam Agus Wahyudi Isro Nurul Hadi Kafi Yusuf Kafi Khusna, Kunti Nafingatul Kun Suharno Kun Suharno Kusnadi, Khoirur rojikin Listyanda, R. Faiz M. Fendy Kussuma Hadi Sufyan M. Yogi Riyantama Isjoni Martha Arum Nugraheni Mudabbirul Hakim Mufti Syafi’i Muhammad Abiyyu Raafi Muhammad Adrian Rizky Muhammad Noor Faishal Zakiy Muktivani Swastiko nur afiyan Nur Hadi Nur Kholis Nur Subkhan Nurhadi Nurhadi Prakoso, Aditya Win R.Faiz Listyanda Rachman Satya Pamungkas Rahayu, Yunita Ramadhani, Wahyuchandra Ranny Puspita Dewi Rio Candra Hermawan Rizal Catur Prasetyo Rizal Rizal Akbar Mantofani Ryan Try Prasetyo Safitra, Mohamad Nanda Salim, M. Faiz Salim, Muhammad Faiz Setya Drana Harry Putra Setyo H. D, Adityo Noor Sigit Mujiarto Sri Hastuti Sri Widodo Sri Widodo Tardho Hakim Taufik, Ikhwan Tegar Armanto Tobing, Rudy P. Trisma Jaya Saputra Wahyuchandra Ramadhani Xander Salahudin Yanuar, Mochamad Riyanto Yoggo Bagus Pamungkas Yudhistira, Dida Ardito Yulianto, Dany Dwi Yusuf Nuruk Nuruk Zuhaeri, Nofal