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All Journal Jurnal Teknik ITS SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin ROTOR: JURNAL ILMIAH TEKNIK MESIN R.E.M (Rekyasa Energi Manufaktur) Jurnal STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Jurnal Elemen JPPM (Jurnal Pengabdian dan Pemberdayaan Masyarakat) International Journal of Marine Engineering Innovation and Research Dedikasi: Jurnal Pengabdian kepada Masyarakat Mechanical Engineering for Society and Industry PEKAT : Jurnal Pengabdian Kepada Masyarakat Medani : Jurnal Pengabdian Masyarakat Jurnal Polimesin
Rahma Rei Sakura
Teknik Mesin Fakultas Teknik Universitas Jember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities 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 Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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The Effect of Coconut Fiber Usage and Clamshell Powder Replacement for Calcium Silicate Board’s Bending Strength Zammi, Khafifulloh Al Faqih Zam; Primaningtyas, Widya Emilia; Kusminah, Imah Luluk; Riani, Novi Indah; Sakura, Rahma Rei; Alfanda, Benedicta Dian
International Journal of Marine Engineering Innovation and Research Vol 10, No 1 (2025)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.22356

Abstract

Calcium silicate boards (CSB) are being explored in the maritime industry due to the mechanical strength and its resintance to humidity. The common CSB comprises fiber, silica sand, and portland cement. Clamshell is one of marine waste, who has a high calcium carbonate (CaCO3) content. Coconut fiber, a natural fiber known for its high strength and durability, presents sustainable solutions for enhancing the material properties of CSB. This study explores the forming mechanism and mechanical properties of the CSB in the usage and varied volume fraction addition of coconut fiber with the varied portion replacement silica sand using clamshell powder. The bending test was performed, and the experimental results were analyzed using ANOVA, to understand the effect of the mixture composition on the bending strength of the CSB. The addition of volume fraction coconut fiber significantly improve the bending strength of the boards, while the replacement of silica sand using clamshell powder gives various result. The maximum bending strength was 13.87 ± 0.64 Mpa by 0% clamshell powder replacement in  9% coconut fiber, and significantly drop at 8.26 ± 2.20 MPa by 50% clamshell powder with 50% silica sand. In fully portion replacement of silica sand, in which the addition of 100% clamshell powder, with 9% coconut fiber, the bending strength measured at 10.29 ± 1.31 MPa. The highest results exceeding the minimum requirement in ISO-8336 category A and B (saturated condition) , class 3 (>13 MPa) standards for interior wall installations. This study providing a more robust and eco-friendly materials alternatives that supports non or maritime industry needs in while resolve the environmental issue.
Chemical Modification of Petung Bamboo Fiber to Hybrid Composites: Modifikasi Kimia Serat Bambu Petung terhadap Komposit Hibrida Yusron Maulana, Raden Muhammad; Rahma Rei Sakura; Nasrul Ilminnafik; Sumarji; Mahros Darsin
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1768

Abstract

This study evaluates the effect of alkali treatment using NaOH solution on the mechanical properties and microstructure of hybrid composites based on epoxy resin reinforced with petung bamboo fiber and fiberglass. Bamboo fibers were immersed in five NaOH concentration variations (0%, 3%, 6%, 9%, 12%) before composite fabrication using the hand lay-up method. Tensile testing was performed according to ASTM D-638 standard and microstructural characterization using Scanning Electron Microscope (SEM). The results showed that 9% alkali treatment produced the best mechanical performance with a tensile strength of 58.68 MPa, elongation of 4.15%, and elastic modulus of 1413.49 MPa. SEM analysis indicated improved fiber-matrix adhesion due to removal of lignin and hemicellulose. Optimal alkali concentration enhanced composite performance, making it a potential candidate for eco-friendly vehicle interior applications.
The Effect of Coconut Fiber Usage and Clamshell Powder Replacement for Calcium Silicate Board’s Bending Strength Khafifulloh Al Faqih Zam Zammi; Widya Emilia Primaningtyas; Imah Luluk Kusminah; Novi Indah Riani; Rahma Rei Sakura; Benedicta Dian Alfanda
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 1 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.4744

Abstract

Calcium silicate boards (CSB) are being explored in the maritime industry due to the mechanical strength and its resintance to humidity. The common CSB comprises fiber, silica sand, and portland cement. Clamshell is one of marine waste, who has a high calcium carbonate (CaCO3) content. Coconut fiber, a natural fiber known for its high strength and durability, presents sustainable solutions for enhancing the material properties of CSB. This study explores the forming mechanism and mechanical properties of the CSB in the usage and varied volume fraction addition of coconut fiber with the varied portion replacement silica sand using clamshell powder. The bending test was performed, and the experimental results were analyzed using ANOVA, to understand the effect of the mixture composition on the bending strength of the CSB. The addition of volume fraction coconut fiber significantly improve the bending strength of the boards, while the replacement of silica sand using clamshell powder gives various result. The maximum bending strength was 13.87 ± 0.64 Mpa by 0% clamshell powder replacement in 9% coconut fiber, and significantly drop at 8.26 ± 2.20 MPa by 50% clamshell powder with 50% silica sand. In fully portion replacement of silica sand, in which the addition of 100% clamshell powder, with 9% coconut fiber, the bending strength measured at 10.29 ± 1.31 MPa. The highest results exceeding the minimum requirement in ISO-8336 category A and B (saturated condition) , class 3 (>13 MPa) standards for interior wall installations. This study providing a more robust and eco-friendly materials alternatives that supports non or maritime industry needs in while resolve the environmental issue.
Effect of stirring duration on the mechanical properties and fracture morphology of Al-Si-Cu/Al₂O₃ composites Imam Rudi Sugara; Salahudin Junus; Rahma Rei Sakura; Faizah Ali; Dwi Wahyu Hardiyanto; Elvira Ayu Arum Fanani; Haidzar Nurdiansyah; Randy Achmad Iqbal Budiadi
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9317

Abstract

Aluminum matrix composites often suffer from low mechanical performance due to poor reinforcement distribution and manufacturing defects during the stir casting process. This study aims to evaluate the effect of stirring duration on the mechanical properties, microstructural distribution, and fracture behaviour of Al-Si-Cu matrix composites reinforced with Al2O3 particles. Composites were fabricated using varying mechanical stirring durations of 5, 10, 15, and 20 minutes, with three replicates evaluated for each experimental condition (n=3). Material performance evaluation was conducted through Ultimate Tensile Strength (UTS), elongation at break, and Brinell hardness (HBW) testing, accompanied by Scanning Electron Microscopy (SEM) for microstructural and fracture morphology analysis. The results indicate that mechanical properties followed a parabolic trend with increasing stirring duration. A 10-minute stirring duration was optimal, achieving peak UTS (163.33 MPa), maximum elongation, and highest hardness (87.32 HBW). Microstructural SEM observation revealed uniform Al2O3 particle dispersion and solid interfacial bonding at 10-minute, yielding a ductile fracture with fine dimples. Conversely, prolonged stirring for 20 minutes significantly reduced UTS to 56.78 MPa and deteriorated elongation, suspected to be due to gas entrapment porosity and particle pull-out voids, which triggered a cleavage-dominated brittle fracture mode. In conclusion, controlling stirring duration is critical to optimizing microstructural homogeneity, enhancing ductility, and preventing premature failure in cast composites.
Co-Authors Adha Mahendra, Erlian Agus Triono Alfanda, Benedicta Dian Alfanda, Benedicta Dian Alfredo Bayu Satriya Amir Biqi Amirur Ridho Muhammad Andana, Himawan D Andi Sanata Anisya Delima Anuary Dwi Rosyid, Wafa Prasetia Ardhyananta, Hosta Badriani , Ririn Endah Bambang Sugiharto Chamim Handoyo Dani Darojat Iskandar Dedi Dwilaksana Digdo Listyadi, Digdo Dwi Djumhariyanto Dwi Wahyu Hardiyanto Elvira Ayu Arum Fanani Eriska Eklezia Dwi Saputri Faizah Ali FX Kristianta Gaguk Jatisukamto Gindeka Bimara Aryantaka Haidzar Nurdiansyah Hary Sutjahjono Hayun Indra Nur Iman HT Prasetiyo, Dani Imah Luluk Kusminah Imam Rudi Sugara Indria Dwi Puspita, Hery Intan Hardiatama Istiqomah Rahmawati K.W., Robertoes Koekoeh Khafifulloh Al Faqih Zam Zammi Kusminah, Imah Luluk M Arief Hidayat M Asrofi M Dimyati Nashrullah M. Fahrur Rozy Hentihu Mahros Darsin Mochamad Asrofi Mochamad Trifiananto Moh. Nurkoyim Kustanto Moh. Wafir Muhammad Katibi Vanhas Nasrul Ilminafik Nasrul Ilminnafik Naufal Fardio Albajili Novel Bagas Satrio Wibowo Novi Indah Riani Pratama Yuli Arianto Primaningtyas, Widya Emilia Puranggo Ganjar Widityo Putratama, Panji Hastawirata Randy Achmad Iqbal Budiadi Riani, Novi Indah Riko Septian Rizky Akhmad Prayogi Robertus Sidartawan Rudianto Salahuddin Junus Salahudin Junus Santoso Mulyadi Suheni Suheni Sumarji Sumarji Syuhri, Skriptyan Noor Hidayatullah Taufik Tri Vicca Kusumadewi Trifiananto, Muhammad Wazirotus Sakinah Welayaturromadhona Yudhistiro, Danang Yuni Hermawan Yusron Maulana, Raden Muhammad Zainul M, Aris Zammi, Khafifulloh Al Faqih Zam