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RISS 인기검색어
- 검색키워드
- 저자 : M.R. Ishak (검색결과 4 건)
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M. R. M. Asyraf,M.R. Ishak,S. M. Sapuan,N. Yidris 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
Cross arms are mainly made up of wood (conventional) and pultruded glass fiber reinforced polymer composite(modern) installed in suspension tower. However, the creep response of both materials has not been fully covered in manyliteratures to explain the long-term durability of the current cross arm design. Thus, it is necessary to find the creep trends andmodels to evaluate the behavior in the tropical outdoor environment. The creep properties of Balau wood and pultrudedcomposite at load of 10, 20 and 30 % of ultimate flexural stress were evaluated from quasi-static flexural test results. Usingseveral creep numerical models, the creep properties of wood and composite cross arms were modelled. The results showedthat the GFRP had a significant value of flexural strength, while Balau wood performed better in flexural modulus. In termsof creep properties, GFRP specimen exhibited high creep resistance with greater stability during transition from elastic toviscoelastic phase. From numerical modelling perspective, the simulated creep trends from Burger and Norton models weredeviated from the experimental data. Subsequently, the most suitable creep model to forecast the creep behavior for wood andcomposite specimens was Findley model. All in all, pultruded composite is the most appropriate durable material to beapplied in cross arms, while Findley model is a suitable model to represent creep performance of anisotropic materials.
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M. R. M. Huzaifah,S. M. Sapuan,Z. Leman,M.R. Ishak 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
In this research, the variation of mechanical properties (i.e. tensile, flexural and impact strength), physicalproperties (i.e. water absorption, SEM and thickness swelling) and thermal properties of sugar palm fibre reinforced vinylester composites were investigated. The composites with different fibre content, which are 10 wt.%, 20 wt.%, 30 wt.% and40 wt.%, were prepared. The additions of sugar palm fibres to vinyl ester reduce tensile and flexural strength of thecomposites, which are 25.1 MPa (10 wt.%), 12.5 MPa (20 wt.%), 9.7 MPa (30 wt.%) and 6.1 MPa (40 wt.%) for tensilestrength, while for flexural strength, the results recorded 48.5 MPa, 24 MPa, 18.8 MPa and 2.5 MPa for 10 wt.%, 20 wt.%,30 wt.% and 40 wt.%. However, sugar palm fibres improve impact strength of the composites especially at 30 wt% with5.4 kJ/m2. The addition of sugar palm fibres also raise the water absorption and thickness swelling of the composites as thepresence of fibres in the composites increase water retained in the composites. Besides that, thermal stability of thecomposites also reduces by the addition of the sugar palm fibres that shows the onset temperature of thermal degradation of10 wt.% was at 270.83 oC, while 40 wt.% was at 196.67 oC.
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M. R. M. Huzaifah,S. M. Sapuan,Z. Leman,M.R. Ishak 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9
The aim of this research is to investigate the effect of soil burial on physical, mechanical and thermal properties ofsugar palm fibre (SPF) reinforced vinyl ester (VE) composites. Neat VE and SPF/VE composites at weight ratio of 10 wt.%SPF were prepared using wet hand lay-up method. The specimens were buried in the soil for 0, 200, 400, 600, 800 and 1000hours to investigate the effect of soil burial to its physical properties (i.e. water absorption), mechanical properties (i.e. tensile,flexural and impact strength) and thermal properties. Obtained results indicated that, the longer soil burial period led to highwater absorption of the composites. After 200 hours of soil burial, the SPF/VE composites water uptake increased 0.92 %compared to neat VE which is 0.42 %. Based on the results, soil burial reduces the mechanical strength of the composites. Tensile, flexural and impact strength decreased rapidly after 200 hours of soil burial compared to neat VE which were28.24 %, 8.04 % and 14.83 %, respectively. Thermal stability after 200 hours of soil burial increase temperature onset of theSPF composites compared to neat VE. Overall, soil burial increased water absorption, temperature onset of the SPFcomposites and at the same time decreased the tensile, flexural and impact strength of the composites.
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A.M. Noor Azammi,S.M. Sapuan,M.R. Ishak,M.T.H. Sultan 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2
In this paper, natural rubber (NR) was mixed with thermoplastic polyurethane (TPU) and kenaf as filler reinforcement for the polymer composite. Mixing the material using the internal mixer and hot press machine was able to blend the material homogeneously. Investigation of the new polymer composite characterisation was carried out by thermal gravimetric analysis (TGA), along with tensile, flexural and impact tests. The TGA for the polymer composite achieved 322 ℃ before degradation and increase in tensile and impact strength with the increase of TPU in the polymer composite matrices were observed. The result indicated an improvement in tensile, flexural and impact strength for the kenaf filled TPU-NR composites. The mixing of kenaf fibre and TPU-NR polymer showed degradation that was gradually diminishing turned into ashes. TGA result showed all compositions of kenaf filled TPU-NR composites samples shared the same peak temperature, being degraded at 600 ℃.
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