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All Journal Jurnal Teknik Mesin METAL : Jurnal Sistem Mekanik dan Termal Journal of Fibers and Polymer Composites
Ilhamdi Ilhamdi
Jurusan Teknik Mesin, Universitas Andalas, Padang
Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Karakteristik Mekanik Komposit Polyester E-Glass dengan Stacking Sequences [0°, 90°, 0°] Ilhamdi Ilhamdi; Dony Hidayat; Fadli Febriyan
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 2 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (619.066 KB) | DOI: 10.25077/metal.3.2.94-100.2019

Abstract

There is one fact that lead composite material to be a unique material among others. Its properties could be settable or flexible with arrangement of composition, orientation and production procedure. Meanwhile other materials seemed to have fixed set after fabrication. Nowadays, one of the widely developed structural composite is polymer based composite with inorganic reinforcement. It is useful in automotive or aircraft component because reasonable strength and much lower density compare to metal. In this study, e-glass fibers were manually laminated with polyester resin in open die using brush. This method is widely known as hand lay up. Fibers were set in stacking sequences of 0o, 90o, and 0o, means a fiber is in perpendicular direction to its neighbor fibers. After complete dried up, composite panel is cut of accordingly to ASTM standard for tensile and compressive testing specimen. In order to examine hole effect, center of gage length specimen was drilled off. Namely, specimen will be distinguished as no hole specimen and open hole specimen.   Results showed tensile strength of 200.58 MPa and 155.22 MPa, compressive strength of 335.73 MPa and 254.1 MPa, for no hole and open hole specimen respectively. Introducing open hole reduces mechanical strength of composite both tensile and compressive. It could be mechanical consideration for safety design of material composite application. Failure mechanism of composite is also influenced by existence of open hole. When no hole specimen will experience failure at near to grip (LAT), open hole specimen has fracture line propagate from hole into width (LGM).
Sifat Mekanik dan Struktur Mikro Logam Paduan Mg-1.6Gd Sebagai Biomaterial yang Larut di dalam Tubuh Oknovia Susanti; Ilhamdi Ilhamdi; Muhammad Ivan Herdian
METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 1 (2020): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1450.392 KB) | DOI: 10.25077/metal.4.1.47-51.2020

Abstract

Recently, the uses of magnesium alloys as implant materials have been potentially applications as biocompatible materials. In this case, the Mg alloys were being concerned because of their mechanical properties that were nearly similar to bones. The addition of Gd in magnesium was in order to control the degradation of magnesium. It is well known that the mechanical properties of Mg-1.6Gd alloys is improved by the small addition. The hardness of the alloys is obtained by the Vickers test with a different position on the samples. The lowest hardness value is 39 HVN, and the highest hardness value is 50 HVN, with the average one is 43.85HVN. Meanwhile, the pure magnesium had 30 HVN. Thus, it could be said that the addition of gadolinium elements could increase the hardness value. Then the tensile test is used a UTM (Universal Testing Machine). The test is used three same untreated samples. From the test are got the ultimate tensile strength of 97-117 MPa, but the ultimate strength of the magnesium is 60 MPa. Microscope optically is used to investigate the microstructure. The grain area is calculated by using the ImageJ program. The result showed that the lowest one is 16  and the highest one is 97.
Pengaruh Penambahan Filler Al2O3 dan TiO2 pada Resin Polyester terhadap Sifat Fisik dan Mekanik Ahmad Hasnul Fajri; Ilhamdi Ilhamdi; Ismet Hari Mulyadi; Jon Affi
Jurnal Teknik Mesin Vol 16 No 2 (2023): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.16.2.1187

Abstract

Polyester composites have been developed to have high strength and light density, but the fracture occurs due to very little plastic deformation or low strain values, pre-failure detection is difficult in these composites due to the rapid propagation of cracks in the composite system. To increase the strength and delay failure, the addition of filler in the form of Al2O3 and TiO2 particles is carried out. The use of particles as fillers in polymer composite materials is increasingly being developed. In this study, Al2O3 and TiO2 particles (0%, 2%, 4%, 6%, 8%, 10% vol.) were added in polyester matrix BQIN EX 157. by casting method; the liquid homogeneous mixture was carefully poured into a simple mould to be air dried. The composites were cut to serve as specimens for density test, mechanical tests such as tensile and compressive tests. The results showed a density of 1.23 g/cm3, a maximum strength of 47 MPa for 2% additional Al2O3 filler, (tensile, decreasing ̴11%) and 120 MPa (compressive) for a maximum of 2% additional Al2O3 (compressive, decreasing ̴3%) with TiO2 filler. The decrease in strength was caused by uneven particle dispersion, voids and agglomeration that occurred during the casting process.
Modified PVA Film from Methanol-Soluble Phenolic Extracts of Spatholobus littoralis Hask as Active Pharmaceutical Packaging Kadriadi Kadriadi; Hairul Abral; Melbi Mahardika; Ilhamdi Ilhamdi; Akmal Akmal; Dian Handayani; Yulianis Yulianis; Mohamad Haafiz Mohamad Kassim; Jeri Ariksa
Journal of Fibers and Polymer Composites Vol. 5 No. 1 (2026): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v5i1.567

Abstract

The development of active pharmaceutical packaging based on biodegradable materials is an important strategy to reduce dependence on single-use plastics and their environmental impact. Polyvinyl alcohol (PVA) is a potential biodegradable polymer, but it has limitations in terms of exposure to ultraviolet (UV) radiation and microbial contamination. This study aims to develop a modified PVA film with methanol-soluble phenolic extract of Spatholobus littoralis Hask as active pharmaceutical packaging with UV protection, antioxidant, and antibacterial functions. The phenolic extract was obtained through a maceration method using methanol as a solvent, while the PVA film was fabricated using the solution casting technique. The PVA film was modified with varying concentrations of phenolic extract of 0, 1.25, 2.5, and 5wt% (PPE0, PPE1.25, PPE2.5, and PPE5), then evaluated for its UV protection properties, antioxidant activity, and antibacterial activity. The results showed that the addition of S. littoralis phenolic extract was able to increase the ability of PVA films to block UV radiation completely (100%) in the 200–400 nm wavelength range. Antioxidant activity testing using the DPPH method showed an increase in free radical scavenging ability as the concentration of phenolic extract increased. In addition, the modified PVA film showed significant antibacterial activity against Staphylococcus aureus and Escherichia coli. These findings indicate that S. littoralis Hask phenolic extract has potential as a natural bioactive agent in the development of environmentally friendly and multifunctional active pharmaceutical packaging, with dual protection capabilities against UV degradation and microbial contamination. This research makes an important contribution to the development of sustainable pharmaceutical packaging materials based on renewable natural resources.
Co-Authors Abral, Hairul Ahmad Hasnul Fajri Akmal Akmal Dian Handayani Dony Hidayat Fadli Febriyan Ismet Hari Mulyadi Jeri Ariksa Jon Affi, Jon Kadriadi Kadriadi Melbi Mahardika Mohamad Haafiz Mohamad Kassim Muhammad Ivan Herdian Susanti, Oknovia Yulianis Yulianis