17 research outputs found
Pengaruh Arah Pengerolan Terhadap Ketanggujan Dan Laju Perambatan Retak Pelat Kapal Grade A
No full textAn Investigation of the effect of rolling on the fracture toughness and crack growth rate for ship steel has been performed. The testing was carried out using compact tension specimens (CTS) on the field to be investigated. The CTS orientation was chosen to be parallel and perpendicular to the rolling orientation. The fracture toughness and crack growth rate tests were conducted in accordance with ASTM standard E 399-83 and ASTM standard E 647 - 86a respectively.
The test \u27results show that the fracture toughness of perpendicular to the rolling direction is slightly higher than of parallel direction. The crack growth rate depends on the range of the stress intensity factor (AK). For low value of AK the crack growth rote is the same for all directions, and for high value of AK, Perpendicular to the rolling direction shows higher than parallel to the rolling direction
Pengaruh Pemanasan Lokal Terhadap Ketangguhan dan Laju PerambatanRetak Plat Baja "Grade B".
No full textABSTRACT
An Investigation of the effect of local heating on the fracture toughness and crack growth rate for ship plates has beee performed. The local heating was carried out using a welding system on the field to be investigated.
A number of plates, which has been welded, was cut to produce a number of specimens which consists of fracture toughness specimens, crack growth rates specimens and other specimens needed. The main test in the research was fracture toughness and crack growth rate. The fracture toughness and crack growth rate were conducted in accordance with AsTm standard E399-83 and ASTM standard E647-86a respectively.
The test results show that the fracture toughness at the HAZ is slightly higher than at the base metal. The crack growth
rate depends on the range of the stress intensity factor (AK). For low value of AK, the crack growth rate at the HAZ is 35%,i lower than at the base metal, and for high value of AK, it shows 46% lower than at the base metal.
Kata Kunci: Perambatan retak, plat baja, perpatahan kritis, plate grad
Pengaruh Pengerasan Regangan Terhadap Ketangguhan Baja Grade B
No full textABSTRACT
The objective of this research is to invesrigate the strain hardening effects on the fracture tougness of plates grade B.
A number of plates, which has been done cooled forging, was cut to produce CTS specimens. Fracture toughness speciment was conducted in accordance with ASTM standard E399-83.
The test results show that the fracture toughness of steel plate is 76 MPalim. The fracture toughness of strain hardened plate is slightly higher than fracture toughness of base steel plate
Utilization of fly ash waste as reinforcement of aluminium matrix composite produced using powder metallurgy (Pemanfaatan Limbah abu terbang sebagai penguat aluminium metal matrix composite dibuat dengan cara metalurgi serbuk)
No full textAluminium matrix composite (AMC) has been prepared from aluminium fine powder as a matrix and fly waste as reinforcement. In this research the amount of fly ash as much as 2,5, 5, 7,5 and 10 wt% was added to the aluminium fine powder. The mixture was compacted using uniaxial with a pressure of 100 MPa and it was pressureless sintered in argon atmosphere at various temperature of 500°, 525°, 550°, 575° and 600°C. Bending strength of AMC was determined using four point bending, hardness was tested using Vickers method, wear rate was tested using pin on disk method. Porosity was tested using Archimedes method and the micro structure was observed using SEM. The result shows that fly ash can be used as reinforcement of AMC. The bending strength and Vickers hardness of AMC increase, wear rate and porosity of AMC decrease with increasing the fly ash content up to 7.5 wt%, while fly ash higher than 7,5 wt% causes a decrease. Porosity, bending strength, wear rate and hardness of AMC are 5,4%, 68,5 MPa, 0,0571 mg/(MPa.m) and 62,6 VHB, respectively. It shows that bending strength, hardness and wear resistance of AMC are higher than pure aluminium
Mechanical Properties of Aluminum/fly Ash Composites Produced by Hot Extrusion
No full textThis research aims to investigate mechanical properties of aluminum matrix composites reinforced with fly ash (AMC/Fly ash) produced using hot extrusion.AMC/Fly ash was prepared from aluminum fine powder as matrix and fly ash as reinforcement. The various amount of fly ash of 5%; 7.5%; 10%; 12.5% and 15% wt were added to the aluminum fine powder. Each composition was mixed using rotary mixer for 3 hours. The mixture was compacted using uniaxial pressing with a pressure of 100 MPa to produce green body. The green body was hot extruded with an extrusion ratio of 0.25 and temperature of 600ºC. Bending strength, Vickers hardness, wear rate and porosity of the AMC/fly ash were measured. The microstructure was observed using SEM. The results show that mechanical properties of the composites such as bending strength and Vickers hardness increase, porosity and wear rate decrease with increasing fly ash content up to 12.5 wt %. Above 12.5 wt % of fly ash those mechanical properties of composites seems to be inverse. The properties of AMC/12.5 wt % fly ash produced using hot extrusion from green body showing the best properties in term of the bending strength, Vickers hardness, porosity and wear resistance, that are 302 MPa; 79 VHN; 0.73 % and 0,0095 mg/(MPa.m), respectively.</jats:p
Pemanfaatan Limbah Abu Terbang Sebagai Penguat Aluminium Matrix Composite
No full textPenelitian ini bertujuan untuk memanfaatkan abu terbang sebagai penguat komposit bermatrik aluminium (AMC). Abu terbang merupakan limbah pembakaran batu bara pada pembangkit listrik tenaga uap. Abu terbang sejumlah 2,5%; 5%; 7,5% dan 10% berat tercamput dengan serbuk aluminium (ukuran serbuk lebih kecil dari 40 µm). Setiap campuran diaduk menggunakan rotay mixer selama 3 jam. Campuran aluminium dan abu terbang dikompaksi secara uniaksial dilanjutkan kompaksi secara isostatik dengan tekanan 100 MPa dan diikuti sintering tanpa tekanan dengan lingkungan gas argon dan variasi temperatur 500°C, 525°C, 550°C, 575°C dan 600°C. Kekuatan banding, kekerasan Vickers, ketahanan aus dan densitas komposit diuji serta struktur mikro diamati menggunakan SEM. Hasil pengujian menunjukkan bahwa sifat mekanis meningkat seiring dengan peningkatan fraksi berat abu terbang sempai 5% berat, selebihnya terjadi penurunan. Kekuatan banding, kekerasan Vickers, porositas dan laju keausan berturut-turut 74 MPa, 66 VHN, 4,5% dan 0,04 mg/(MPa.m)
Effects sintering temperature on mechanical properties of aluminium 5% Fly ash composite produced using hot pressing
No full textThis research aims to investigate mechanical properties of aluminium matrix composites reinforced with fly ash (AMC/fly ash) produced using hot isostatic pressing (HIP). Aluminium matrix composites (AMC) were prepared from aluminium fine powder as matrix and fly ash as reinforcement The amount of fly ash of 5% wt was added to the aluminium fine powder. It was then mixed using rotary mixer for 3 hr. The mixture was compacted using uniaxial pressing with a pressure of 100 MPa and it was followed hot isostatic pressed at various temperature of 525°C, 550°C and 575°C for 3 hours. Bending strength , Vickers hardness, wear resistance and density of the AMC were tested, and the micro structures were observed using SEM. The results show that the bending strength, Vickers hardness and wear resistance increase with increasing sintering temperature up to 50°C. Those properties are not significantly influenced on speciment sintered above 550°C. The bending strength, Vikers hardness, porosity and wear rate of specimens sintered at 550°C for 3hr are 77 MPa, 63 VHN, 2,6% and 0,03mg/(MPa.m), respectivel
Pengaruh pemanasan lokal terhadap ketangguhan dan laju perambatan retak pelat baja kapal "grade "A=The Effects of Local Heating on the Fracture Toughness and Crack Growth Rate of "Grade A" Ship Plate
No full text.An Investigation of the effect ⢠of local heating on the fracture toughness and crack growth rate for ship steel plates has been performed. The local heating was carried out using a welding system on the field to be investigated.
A number of plates, which has been welded, was cut to produce a number of specimens which consisted of fracture tougness specimens, crack growth rates specimens, and other specimens needed. The main test in the research was fracture toughness and crack growth rate, which were conducted in accordance with ASTM standard E399-83 and ASTM standard E647-86a, respectively.
The test results showed that the fracture toughness at the HAZ was slightly higher than that at the base metal. The crack growth rate depended on the range of the stress intensity factor (AK). For low value of AK, the crack growth rate at the HAZ was lower than that at the base metal, and for high value of AK, it showed higher than that at the base metal.
Key words : Fracture, crack, weld, stee
Pemanfaatan Limbah Abu Terbang Sebagai Penguat Aluminium Matrix Composite
No full textThis research aims to utilize fly ash which is obtained from waste of combustion of coal in steam power plant as a reinforcement of aluminum matrix composite (AMC). The amounts of fly ash of 2.5%, 5%, 7.5% and 10% wt were added to fine aluminum powder (dimension of particles are smaller than 40 µm). Each composition was mixed using a rotary mixer for 3 hr. The mixture was uniaxially pressed and it was followed by isostatic compaction with a pressure of 100 MPa to produce green bodies. They was pressureless sintered in argon atmosphere at various temperatures of 500°C, 525°C, 550°C, 575°C and 600ºC. Bending strength, Vickers hardness, wear resistance, density of the AMC were tested, and the microstructures were observed using SEM. The results show that the mechanical properties increase with increasing the fly ash content up to 5% wt. The bending strength, hardness, porosity and wear rate are 74 MPa, 66 VHN, 4.5% and 0.04 mg/(MPa.m), respectively.
Abstract in Bahasa Indonesia:
Penelitian ini bertujuan untuk memanfaatkan abu terbang sebagai penguat komposit bermatrik aluminium (AMC). Abu terbang merupakan limbah pembakaran batu bara pada pembangkit listrik tenaga uap. Abu terbang sejumlah 2,5%; 5%; 7,5% dan 10% berat dicampur dengan serbuk aluminium (ukuran serbuk lebih kesil dari 40 µm). Setiap campuran diaduk menggunakan rotay mixer selama 3 jam. Campuran aluminum dan abu terbang dikompaksi secara uniaksial dilanjutkan kompaksi secara isostatik dengan tekanan 100 MPa dan diikuti sintering tanpa tekanan dengan lingkungan gas argon dan variasi temperatur 500°C, 525°C, 550°C, 575°C dan 600°C. Kekuatan bending, kekerasan Vickers, ketahanan aus dan densitas komposit diuji serta struktur mikro diamati menggunakan SEM. Hasil pengujian menunjukkan bahwa sifat mekanis meningkat seiring dengan peningkatan fraksi berat abu terbang sampai 5% berat, selebihnya terjadi penurunan. Kekuatam bending, kekerasan Vickers, porositas dan laju keausan berturut-turut 74 MPa, 66 VHN, 4,5% dan 0,04 mg/(MPa.m).
Kata kunci: Aluminum Matrix Composite, abu terbang, kompaksi, isostatik
Pemanfaatan Limbah Abu Terbang Sebagai Penguat Aluminium Matrix Composite
No full textThis research aims to utilize fly ash which is obtained from waste of combustion of coal in steam power plant as a reinforcement of aluminum matrix composite (AMC). The amounts of fly ash of 2.5%, 5%, 7.5% and 10% wt were added to fine aluminum powder (dimension of particles are smaller than 40 µm). Each composition was mixed using a rotary mixer for 3 hr. The mixture was uniaxially pressed and it was followed by isostatic compaction with a pressure of 100 MPa to produce green bodies. They was pressureless sintered in argon atmosphere at various temperatures of 500°C, 525°C, 550°C, 575°C and 600ºC. Bending strength, Vickers hardness, wear resistance, density of the AMC were tested, and the microstructures were observed using SEM. The results show that the mechanical properties increase with increasing the fly ash content up to 5% wt. The bending strength, hardness, porosity and wear rate are 74 MPa, 66 VHN, 4.5% and 0.04 mg/(MPa.m), respectively.
Abstract in Bahasa Indonesia:
Penelitian ini bertujuan untuk memanfaatkan abu terbang sebagai penguat komposit bermatrik aluminium (AMC). Abu terbang merupakan limbah pembakaran batu bara pada pembangkit listrik tenaga uap. Abu terbang sejumlah 2,5%; 5%; 7,5% dan 10% berat dicampur dengan serbuk aluminium (ukuran serbuk lebih kesil dari 40 µm). Setiap campuran diaduk menggunakan rotay mixer selama 3 jam. Campuran aluminum dan abu terbang dikompaksi secara uniaksial dilanjutkan kompaksi secara isostatik dengan tekanan 100 MPa dan diikuti sintering tanpa tekanan dengan lingkungan gas argon dan variasi temperatur 500°C, 525°C, 550°C, 575°C dan 600°C. Kekuatan bending, kekerasan Vickers, ketahanan aus dan densitas komposit diuji serta struktur mikro diamati menggunakan SEM. Hasil pengujian menunjukkan bahwa sifat mekanis meningkat seiring dengan peningkatan fraksi berat abu terbang sampai 5% berat, selebihnya terjadi penurunan. Kekuatam bending, kekerasan Vickers, porositas dan laju keausan berturut-turut 74 MPa, 66 VHN, 4,5% dan 0,04 mg/(MPa.m).
Kata kunci: Aluminum Matrix Composite, abu terbang, kompaksi, isostatik
