Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)

The effects of porosity on mechanical properties of cast discontinuous reinforced meta] matrix composite (DRMMC) were investigated. Hence, a casting rig was fabricated to produce DRMMCs via conventional and modified stir casting method . The modified stir casting method performed pre-heating of r...

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Main Author: Syed Ahmad, Syarifah Nur Aqida
Format: Thesis
Language:English
English
English
Published: 2004
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spelling my-uthm-ep.86672023-05-02T02:14:47Z Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC) 2004-02 Syed Ahmad, Syarifah Nur Aqida TA Engineering (General). Civil engineering (General) TA401-492 Materials of engineering and construction. Mechanics of materials The effects of porosity on mechanical properties of cast discontinuous reinforced meta] matrix composite (DRMMC) were investigated. Hence, a casting rig was fabricated to produce DRMMCs via conventional and modified stir casting method . The modified stir casting method performed pre-heating of reinforcement particles during matrix alloy melting. Silicon carbide particle reinforced aluminium alloy composites were produced with three different stirring speeds: 100, 200 and 500rpm. Cast DRMMCs were evaluated in as-cast condition for microstructure analysis, porosity and density measurement and mechanical testing. The mechanical properties of cast DRMMC were determined from tensile and fatigue tests conducted at room temperature. Tensile tests were referred to ASTM B557 standard while the axial fatigue test (ASTM E466) was conducted at stress ratio (R) of -1. A finite element method (FEM) analysis was carried out using Solidworks 2003 software. It was found that the major causes of porosity occurrence in cast DRMMC were clustered silicon carbide particles, gas entrapment and solidification shrinkage. From porosity measurement, conventionally stir cast DRMMCs contained higher porosity compared to the modified stir cast DRMMCs. The least content of porosity evaluated is at 0.09% in modified stir cast DRMMC, while the highest is at 12.45% in conventionally stir cast DRMMC. Fatigue strength (at 1 x 107 cycles) of cast DRMMCs at 5, 10, and 15% reinforcing SiC particle were 129.7, 141.5 and 157.3 MPa respectively. Based on the FEM analysis, porosity in conventionally stir cast DRMMC promotes higher von Mises stress as much as 40.2 MPa compared to 12.6 MPa in modified stir cast DRMMC. The porosity contents increased with increasing silicon carbide particles. Higher stirring speed tended to entrap more gas during mixing, whereas a lower stirring speed was ineffective to disperse SiC particles and results in clustering. Increasing porosity content in cast DRMMC had decreased the density and tensile properties ofDRMMC as depicted by the FEM analysis. Though, fatigue strength increased as a result of existing constraints in form of porosity 2004-02 Thesis http://eprints.uthm.edu.my/8667/ http://eprints.uthm.edu.my/8667/1/24p%20SYARIFAH%20NUR%20AQIDA%20SYED%20AHMAD.pdf text en public http://eprints.uthm.edu.my/8667/2/SYARIFAH%20NUR%20AQIDA%20SYED%20AHMAD%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/8667/3/SYARIFAH%20NUR%20AQIDA%20SYED%20AHMAD%20WATERMARK.pdf text en validuser mphil masters Kolej Universiti Teknologi Tun Hussein Onn Fakulti Kejuruteraan Mekanikal
institution Universiti Tun Hussein Onn Malaysia
collection UTHM Institutional Repository
language English
English
English
topic TA Engineering (General)
Civil engineering (General)
TA Engineering (General)
Civil engineering (General)
spellingShingle TA Engineering (General)
Civil engineering (General)
TA Engineering (General)
Civil engineering (General)
Syed Ahmad, Syarifah Nur Aqida
Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)
description The effects of porosity on mechanical properties of cast discontinuous reinforced meta] matrix composite (DRMMC) were investigated. Hence, a casting rig was fabricated to produce DRMMCs via conventional and modified stir casting method . The modified stir casting method performed pre-heating of reinforcement particles during matrix alloy melting. Silicon carbide particle reinforced aluminium alloy composites were produced with three different stirring speeds: 100, 200 and 500rpm. Cast DRMMCs were evaluated in as-cast condition for microstructure analysis, porosity and density measurement and mechanical testing. The mechanical properties of cast DRMMC were determined from tensile and fatigue tests conducted at room temperature. Tensile tests were referred to ASTM B557 standard while the axial fatigue test (ASTM E466) was conducted at stress ratio (R) of -1. A finite element method (FEM) analysis was carried out using Solidworks 2003 software. It was found that the major causes of porosity occurrence in cast DRMMC were clustered silicon carbide particles, gas entrapment and solidification shrinkage. From porosity measurement, conventionally stir cast DRMMCs contained higher porosity compared to the modified stir cast DRMMCs. The least content of porosity evaluated is at 0.09% in modified stir cast DRMMC, while the highest is at 12.45% in conventionally stir cast DRMMC. Fatigue strength (at 1 x 107 cycles) of cast DRMMCs at 5, 10, and 15% reinforcing SiC particle were 129.7, 141.5 and 157.3 MPa respectively. Based on the FEM analysis, porosity in conventionally stir cast DRMMC promotes higher von Mises stress as much as 40.2 MPa compared to 12.6 MPa in modified stir cast DRMMC. The porosity contents increased with increasing silicon carbide particles. Higher stirring speed tended to entrap more gas during mixing, whereas a lower stirring speed was ineffective to disperse SiC particles and results in clustering. Increasing porosity content in cast DRMMC had decreased the density and tensile properties ofDRMMC as depicted by the FEM analysis. Though, fatigue strength increased as a result of existing constraints in form of porosity
format Thesis
qualification_name Master of Philosophy (M.Phil.)
qualification_level Master's degree
author Syed Ahmad, Syarifah Nur Aqida
author_facet Syed Ahmad, Syarifah Nur Aqida
author_sort Syed Ahmad, Syarifah Nur Aqida
title Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)
title_short Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)
title_full Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)
title_fullStr Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)
title_full_unstemmed Proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (DRMMC)
title_sort proposity study and effects on mechanical properties of discontinuous reinforced metal matrix composite (drmmc)
granting_institution Kolej Universiti Teknologi Tun Hussein Onn
granting_department Fakulti Kejuruteraan Mekanikal
publishDate 2004
url http://eprints.uthm.edu.my/8667/1/24p%20SYARIFAH%20NUR%20AQIDA%20SYED%20AHMAD.pdf
http://eprints.uthm.edu.my/8667/2/SYARIFAH%20NUR%20AQIDA%20SYED%20AHMAD%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/8667/3/SYARIFAH%20NUR%20AQIDA%20SYED%20AHMAD%20WATERMARK.pdf
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