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All Journal Makara Journal of Technology
Tresna Soemardi, Tresna
Departemen Teknik Mesin, Fakultas Teknik, Universitas Indonesia, Depok 16424, Indonesia
Computer Science & IT

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Mechanical properties of ramie fiber reinforced epoxy lamina composite for socket prosthesis Soemardi, Tresna; Kusumaningsih, Widjajalaksmi; Irawan, Agustinus
Makara Journal of Technology Vol 13, No 2 (2009)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (553.049 KB) | DOI: 10.7454/mst.v13i2.168

Abstract

This paper presents an investigation into the application of natural fiber composite especially ramie fiber reinforced epoxy lamina composite for socket prosthesis. The research focuses on the tensile and shear strength from ramie fiber reinforced epoxy lamina composite which will be applied as alternative material for socket prosthesis. The research based on American Society for Testing Material (ASTM) standard D 3039/D 3039M for tensile strength and ASTM D 4255/D 4255M-83 for shear strength. The ramie fiber applied is a fiber continue 100 % Ne14S with Epoxy Resin Bakelite EPR 174 as matrix and Epoxy Hardener V-140 as hardener. The sample composite test made by hand lay up method. Multiaxial characteristic from ramie fiber reinforced epoxy composite will be compared with ISO standard for plastic/polymer for health application and refers strength of material application at Prosthetics and Orthotics. The analysis was completed with the mode of the failure and the failure criterion observation by using Scanning Electron Microscope (SEM). Based on results of the research could be concluded that ramie fiber reinforced epoxy composite could be developed further as the alternative material for socket prosthesis on Vf 40-50%. Results of the research will be discussed in more detail in this paper.
Diffuser Optimation at Exhaust System with Catalytic Converter for 110 cc Mopet with Fluid Flow CFD Simulation Soemardi, Tresna; Siswantara, Ahmad; Erwin, Erwin
Makara Journal of Technology Vol 7, No 2 (2003)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1049.069 KB) | DOI: 10.7454/mst.v7i2.65

Abstract

CFD simulation used to get behavior of exhaust gas through catalyst, this result will be used to optimize geometry form to perform uniform stream distribution to catalyst, and CFD Simulation will used to analyze backpressure that happened at the model.
Analysis of Kancils Car Knuckle Prototype Soemardi, Tresna; Mahmudah, Aida
Makara Journal of Technology Vol 8, No 1 (2004)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (258.059 KB) | DOI: 10.7454/mst.v8i1.80

Abstract

The objective of this work is to execute strength analysis of knuckle, which is made from FCD 50, by using static analysis on maximum loading. This maximum loading is obtained from front axle loading calculation on particular operating condition. That is, vehicle is braking while cornering in down hill. From previous vehicle loading calculation, we get a number of loading values on different speed and deceleration. At the end, we get a value of speed and deceleration that guarantee the vehicle safety if it is braking while cornering in down hill. As comparison, loading calculation is executed too for same operating condition on level ground. This is because of different deceleration for each operating condition, 0,5g for operating condition on downhill and 0,2g on level ground. The result shows that maximum loading occurred when vehicle is operated on down hill is larger than on level ground. Study of static focused on quantitative description of loads that act on technical structure in equilibrium.
Co-Authors Agustinus Irawan, Agustinus Ahmad Siswantara, Ahmad Aida Mahmudah Erwin Erwin Widjajalaksmi Kusumaningsih, Widjajalaksmi