The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

Dai Gil Lee - One of the best experts on this subject based on the ideXlab platform.

  • effect of the smart cure cycle on the performance of the co cured Aluminum Composite hybrid shaft
    Composite Structures, 2006
    Co-Authors: Hak-sung Kim, Sang Wook Park, Hui Yun Hwang, Dai Gil Lee
    Abstract:

    Abstract In this work, a smart curing method for the co-cured Aluminum/Composite hybrid shaft which can reduce the thermal residual stresses generated during co-curing bonding operation between the Composite layer and the Aluminum tube was applied. In order to reduce the thermal residual stresses generated during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the Composite and the Aluminum tube, a smart cure cycle composed of cooling and reheating cycles was applied. The heating and cooling operations were realized using a pan type heater and water cooling system. The thermo-mechanical properties of the high modulus carbon epoxy Composite were measured by a DSC (differential scanning calorimetry) and rheometer to obtain an optimal time to apply the cooling operation. Curvature experiment of the co-cure bonded steel/Composite strip was performed to investigate the effect of cure cycle on generation of the thermal residual stress. Also, the thermal residual stresses of the Aluminum/Composite hybrid shaft were measured using strain gauges with respect to cure cycles. Finally, torsional fatigue test and vibration test of the Aluminum/Composite hybrid shaft were performed, and it has been found that this method might be used effectively in manufacturing of the co-cured Aluminum/Composite hybrid propeller shaft to improve the dynamic torque characteristics.

  • Effect of the smart cure cycle on the performance of the co-cured Aluminum/Composite hybrid shaft
    Composite Structures, 2006
    Co-Authors: Hak-sung Kim, Sang Wook Park, Dai Gil Lee, Hui Yun Hwang
    Abstract:

    Abstract In this work, a smart curing method for the co-cured Aluminum/Composite hybrid shaft which can reduce the thermal residual stresses generated during co-curing bonding operation between the Composite layer and the Aluminum tube was applied. In order to reduce the thermal residual stresses generated during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the Composite and the Aluminum tube, a smart cure cycle composed of cooling and reheating cycles was applied. The heating and cooling operations were realized using a pan type heater and water cooling system. The thermo-mechanical properties of the high modulus carbon epoxy Composite were measured by a DSC (differential scanning calorimetry) and rheometer to obtain an optimal time to apply the cooling operation. Curvature experiment of the co-cure bonded steel/Composite strip was performed to investigate the effect of cure cycle on generation of the thermal residual stress. Also, the thermal residual stresses of the Aluminum/Composite hybrid shaft were measured using strain gauges with respect to cure cycles. Finally, torsional fatigue test and vibration test of the Aluminum/Composite hybrid shaft were performed, and it has been found that this method might be used effectively in manufacturing of the co-cured Aluminum/Composite hybrid propeller shaft to improve the dynamic torque characteristics.

  • Optimal design of the press fit joint for a hybrid Aluminum/Composite drive shaft
    Composite Structures, 2005
    Co-Authors: Hak-sung Kim, Dai Gil Lee
    Abstract:

    Abstract In this work, a one-piece hybrid drive shaft composed of Aluminum and carbon/epoxy Composite was designed for a rear wheel drive automobile. The Aluminum yoke was joined to the hybrid shaft by the press fit joining method using a steel ring which has many small teeth to increase reliability and to reduce manufacturing cost. To obtain high strength of the press fit joint, an optimal design method for the teeth was devised with respect to number and shape of the steel teeth. The developed optimal design method predicted well the static torque capability and failure mode of the press fit joint. Then, the prototype one-piece automotive hybrid Aluminum/Composite drive shaft was manufactured and tested. The one-piece automotive hybrid Aluminum/Composite drive shaft allowed 50% mass reduction compared with the conventional two-piece steel drive shaft.

  • Foreign objects impact damage characteristics of Aluminum/Composite hybrid drive shaft
    Composite Structures, 2004
    Co-Authors: Hak-sung Kim, Byung Chul Kim, Tae Seong Lim, Dai Gil Lee
    Abstract:

    In this work, the low velocity impact damage characteristics of Aluminum/Composite hybrid drive shaft were investigated. The hybrid drive shaft was manufactured by stacking carbon epoxy Composite prepregs and insulating layer for galvanic corrosion on the inner surface of an Aluminum tube, and co-curing them in an autoclave under recommended cure cycle. After impacting the co-cured hybrid drive shafts using a drop-weight impact tester, the damage and delamination of the Composite layers were observed with an ultrasonic C-scan, from which the damage modes of Aluminum/Composite hybrid shaft were found with respect to the stacking sequence of Composite materials, the thickness of the Aluminum tube and the impact energy. Finally, optimal stacking sequence of the Composite material and optimal thickness of the Aluminum tube for the drive shaft for low velocity impact were suggested.

  • design and manufacture of an automotive hybrid Aluminum Composite drive shaft
    Composite Structures, 2004
    Co-Authors: Dai Gil Lee, Hak-sung Kim, Jong Woon Kim, Jin Kook Kim
    Abstract:

    Substituting Composite structures for conventional metallic structures has many advantages because of higher specific stiffness and higher specific strength of Composite materials. In this work, one-piece automotive hybrid Aluminum/Composite drive shaft was developed with a new manufacturing method, in which a carbon fiber epoxy Composite layer was co-cured on the inner surface of an Aluminum tube rather than wrapping on the outer surface to prevent the Composite layer from being damaged by external impact and absorption of moisture. The optimal stacking sequence of the Composite layer was determined considering the thermal residual stresses of interface between the Aluminum tube and the Composite layer calculated by finite element analysis. Press fitting method for the joining of the Aluminum/Composite tube and steel yokes was devised to improve reliability and to reduce manufacturing cost, compared to other joining methods such as adhesively bonded, bolted or riveted and welded joints. Protrusion shapes on the inner surface of steel yoke were created to increase the torque capability of the press fitted joint. From experimental results, it was found that the developed one-piece automotive hybrid Aluminum/Composite drive shaft had 75% mass reduction, 160% increase in torque capability compared with a conventional two-piece steel drive shaft. It also had 9390 rpm of natural frequency which was higher than the design specification of 9200 rpm.

Haowei Wang - One of the best experts on this subject based on the ideXlab platform.

  • study on damping capacity of Aluminum Composite reinforced with in situ tial3 rod
    Materials & Design, 2008
    Co-Authors: Yijie Zhang, Haowei Wang
    Abstract:

    Abstract Damping capacity of TiAl3 reinforced Aluminum Composite was investigated. The Mixed-Salt reaction method was employed to fabricate Al/TiAl3 Composite. Samples of dimension 50 × 5 × 1 mm for damping measurement were obtained by spark machining. Dynamic mechanical thermal analyzer was employed to study the damping capacity of TiAl3 reinforced Composites and Aluminum base alloy over a temperature range of 30–300 °C. Experiment results show that the damping capacity of Al/TiAl3 Composites is higher than that of Al matrix and is proportional to the volume fraction of TiAl3 reinforcement. The damping mechanisms associated with Al/TiAl3 Composites were ascribed to dislocation damping at low testing temperatures, and to interface damping at relative high temperatures.

  • study on damping capacity of Aluminum Composite reinforced with in situ tial3 rod
    Materials & Design, 2008
    Co-Authors: Yijie Zhang, Xianfeng Li, Haowei Wang
    Abstract:

    Abstract Damping capacity of TiAl3 reinforced Aluminum Composite was investigated. The Mixed-Salt reaction method was employed to fabricate Al/TiAl3 Composite. Samples of dimension 50 × 5 × 1 mm for damping measurement were obtained by spark machining. Dynamic mechanical thermal analyzer was employed to study the damping capacity of TiAl3 reinforced Composites and Aluminum base alloy over a temperature range of 30–300 °C. Experiment results show that the damping capacity of Al/TiAl3 Composites is higher than that of Al matrix and is proportional to the volume fraction of TiAl3 reinforcement. The damping mechanisms associated with Al/TiAl3 Composites were ascribed to dislocation damping at low testing temperatures, and to interface damping at relative high temperatures.

Hak-sung Kim - One of the best experts on this subject based on the ideXlab platform.

  • effect of the smart cure cycle on the performance of the co cured Aluminum Composite hybrid shaft
    Composite Structures, 2006
    Co-Authors: Hak-sung Kim, Sang Wook Park, Hui Yun Hwang, Dai Gil Lee
    Abstract:

    Abstract In this work, a smart curing method for the co-cured Aluminum/Composite hybrid shaft which can reduce the thermal residual stresses generated during co-curing bonding operation between the Composite layer and the Aluminum tube was applied. In order to reduce the thermal residual stresses generated during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the Composite and the Aluminum tube, a smart cure cycle composed of cooling and reheating cycles was applied. The heating and cooling operations were realized using a pan type heater and water cooling system. The thermo-mechanical properties of the high modulus carbon epoxy Composite were measured by a DSC (differential scanning calorimetry) and rheometer to obtain an optimal time to apply the cooling operation. Curvature experiment of the co-cure bonded steel/Composite strip was performed to investigate the effect of cure cycle on generation of the thermal residual stress. Also, the thermal residual stresses of the Aluminum/Composite hybrid shaft were measured using strain gauges with respect to cure cycles. Finally, torsional fatigue test and vibration test of the Aluminum/Composite hybrid shaft were performed, and it has been found that this method might be used effectively in manufacturing of the co-cured Aluminum/Composite hybrid propeller shaft to improve the dynamic torque characteristics.

  • Effect of the smart cure cycle on the performance of the co-cured Aluminum/Composite hybrid shaft
    Composite Structures, 2006
    Co-Authors: Hak-sung Kim, Sang Wook Park, Dai Gil Lee, Hui Yun Hwang
    Abstract:

    Abstract In this work, a smart curing method for the co-cured Aluminum/Composite hybrid shaft which can reduce the thermal residual stresses generated during co-curing bonding operation between the Composite layer and the Aluminum tube was applied. In order to reduce the thermal residual stresses generated during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the Composite and the Aluminum tube, a smart cure cycle composed of cooling and reheating cycles was applied. The heating and cooling operations were realized using a pan type heater and water cooling system. The thermo-mechanical properties of the high modulus carbon epoxy Composite were measured by a DSC (differential scanning calorimetry) and rheometer to obtain an optimal time to apply the cooling operation. Curvature experiment of the co-cure bonded steel/Composite strip was performed to investigate the effect of cure cycle on generation of the thermal residual stress. Also, the thermal residual stresses of the Aluminum/Composite hybrid shaft were measured using strain gauges with respect to cure cycles. Finally, torsional fatigue test and vibration test of the Aluminum/Composite hybrid shaft were performed, and it has been found that this method might be used effectively in manufacturing of the co-cured Aluminum/Composite hybrid propeller shaft to improve the dynamic torque characteristics.

  • Optimal design of the press fit joint for a hybrid Aluminum/Composite drive shaft
    Composite Structures, 2005
    Co-Authors: Hak-sung Kim, Dai Gil Lee
    Abstract:

    Abstract In this work, a one-piece hybrid drive shaft composed of Aluminum and carbon/epoxy Composite was designed for a rear wheel drive automobile. The Aluminum yoke was joined to the hybrid shaft by the press fit joining method using a steel ring which has many small teeth to increase reliability and to reduce manufacturing cost. To obtain high strength of the press fit joint, an optimal design method for the teeth was devised with respect to number and shape of the steel teeth. The developed optimal design method predicted well the static torque capability and failure mode of the press fit joint. Then, the prototype one-piece automotive hybrid Aluminum/Composite drive shaft was manufactured and tested. The one-piece automotive hybrid Aluminum/Composite drive shaft allowed 50% mass reduction compared with the conventional two-piece steel drive shaft.

  • Foreign objects impact damage characteristics of Aluminum/Composite hybrid drive shaft
    Composite Structures, 2004
    Co-Authors: Hak-sung Kim, Byung Chul Kim, Tae Seong Lim, Dai Gil Lee
    Abstract:

    In this work, the low velocity impact damage characteristics of Aluminum/Composite hybrid drive shaft were investigated. The hybrid drive shaft was manufactured by stacking carbon epoxy Composite prepregs and insulating layer for galvanic corrosion on the inner surface of an Aluminum tube, and co-curing them in an autoclave under recommended cure cycle. After impacting the co-cured hybrid drive shafts using a drop-weight impact tester, the damage and delamination of the Composite layers were observed with an ultrasonic C-scan, from which the damage modes of Aluminum/Composite hybrid shaft were found with respect to the stacking sequence of Composite materials, the thickness of the Aluminum tube and the impact energy. Finally, optimal stacking sequence of the Composite material and optimal thickness of the Aluminum tube for the drive shaft for low velocity impact were suggested.

  • design and manufacture of an automotive hybrid Aluminum Composite drive shaft
    Composite Structures, 2004
    Co-Authors: Dai Gil Lee, Hak-sung Kim, Jong Woon Kim, Jin Kook Kim
    Abstract:

    Substituting Composite structures for conventional metallic structures has many advantages because of higher specific stiffness and higher specific strength of Composite materials. In this work, one-piece automotive hybrid Aluminum/Composite drive shaft was developed with a new manufacturing method, in which a carbon fiber epoxy Composite layer was co-cured on the inner surface of an Aluminum tube rather than wrapping on the outer surface to prevent the Composite layer from being damaged by external impact and absorption of moisture. The optimal stacking sequence of the Composite layer was determined considering the thermal residual stresses of interface between the Aluminum tube and the Composite layer calculated by finite element analysis. Press fitting method for the joining of the Aluminum/Composite tube and steel yokes was devised to improve reliability and to reduce manufacturing cost, compared to other joining methods such as adhesively bonded, bolted or riveted and welded joints. Protrusion shapes on the inner surface of steel yoke were created to increase the torque capability of the press fitted joint. From experimental results, it was found that the developed one-piece automotive hybrid Aluminum/Composite drive shaft had 75% mass reduction, 160% increase in torque capability compared with a conventional two-piece steel drive shaft. It also had 9390 rpm of natural frequency which was higher than the design specification of 9200 rpm.

Yijie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • study on damping capacity of Aluminum Composite reinforced with in situ tial3 rod
    Materials & Design, 2008
    Co-Authors: Yijie Zhang, Haowei Wang
    Abstract:

    Abstract Damping capacity of TiAl3 reinforced Aluminum Composite was investigated. The Mixed-Salt reaction method was employed to fabricate Al/TiAl3 Composite. Samples of dimension 50 × 5 × 1 mm for damping measurement were obtained by spark machining. Dynamic mechanical thermal analyzer was employed to study the damping capacity of TiAl3 reinforced Composites and Aluminum base alloy over a temperature range of 30–300 °C. Experiment results show that the damping capacity of Al/TiAl3 Composites is higher than that of Al matrix and is proportional to the volume fraction of TiAl3 reinforcement. The damping mechanisms associated with Al/TiAl3 Composites were ascribed to dislocation damping at low testing temperatures, and to interface damping at relative high temperatures.

  • study on damping capacity of Aluminum Composite reinforced with in situ tial3 rod
    Materials & Design, 2008
    Co-Authors: Yijie Zhang, Xianfeng Li, Haowei Wang
    Abstract:

    Abstract Damping capacity of TiAl3 reinforced Aluminum Composite was investigated. The Mixed-Salt reaction method was employed to fabricate Al/TiAl3 Composite. Samples of dimension 50 × 5 × 1 mm for damping measurement were obtained by spark machining. Dynamic mechanical thermal analyzer was employed to study the damping capacity of TiAl3 reinforced Composites and Aluminum base alloy over a temperature range of 30–300 °C. Experiment results show that the damping capacity of Al/TiAl3 Composites is higher than that of Al matrix and is proportional to the volume fraction of TiAl3 reinforcement. The damping mechanisms associated with Al/TiAl3 Composites were ascribed to dislocation damping at low testing temperatures, and to interface damping at relative high temperatures.

Hui Yun Hwang - One of the best experts on this subject based on the ideXlab platform.

  • effect of the smart cure cycle on the performance of the co cured Aluminum Composite hybrid shaft
    Composite Structures, 2006
    Co-Authors: Hak-sung Kim, Sang Wook Park, Hui Yun Hwang, Dai Gil Lee
    Abstract:

    Abstract In this work, a smart curing method for the co-cured Aluminum/Composite hybrid shaft which can reduce the thermal residual stresses generated during co-curing bonding operation between the Composite layer and the Aluminum tube was applied. In order to reduce the thermal residual stresses generated during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the Composite and the Aluminum tube, a smart cure cycle composed of cooling and reheating cycles was applied. The heating and cooling operations were realized using a pan type heater and water cooling system. The thermo-mechanical properties of the high modulus carbon epoxy Composite were measured by a DSC (differential scanning calorimetry) and rheometer to obtain an optimal time to apply the cooling operation. Curvature experiment of the co-cure bonded steel/Composite strip was performed to investigate the effect of cure cycle on generation of the thermal residual stress. Also, the thermal residual stresses of the Aluminum/Composite hybrid shaft were measured using strain gauges with respect to cure cycles. Finally, torsional fatigue test and vibration test of the Aluminum/Composite hybrid shaft were performed, and it has been found that this method might be used effectively in manufacturing of the co-cured Aluminum/Composite hybrid propeller shaft to improve the dynamic torque characteristics.

  • Effect of the smart cure cycle on the performance of the co-cured Aluminum/Composite hybrid shaft
    Composite Structures, 2006
    Co-Authors: Hak-sung Kim, Sang Wook Park, Dai Gil Lee, Hui Yun Hwang
    Abstract:

    Abstract In this work, a smart curing method for the co-cured Aluminum/Composite hybrid shaft which can reduce the thermal residual stresses generated during co-curing bonding operation between the Composite layer and the Aluminum tube was applied. In order to reduce the thermal residual stresses generated during co-cure bonding stages due to the difference of coefficients of thermal expansions (CTE) of the Composite and the Aluminum tube, a smart cure cycle composed of cooling and reheating cycles was applied. The heating and cooling operations were realized using a pan type heater and water cooling system. The thermo-mechanical properties of the high modulus carbon epoxy Composite were measured by a DSC (differential scanning calorimetry) and rheometer to obtain an optimal time to apply the cooling operation. Curvature experiment of the co-cure bonded steel/Composite strip was performed to investigate the effect of cure cycle on generation of the thermal residual stress. Also, the thermal residual stresses of the Aluminum/Composite hybrid shaft were measured using strain gauges with respect to cure cycles. Finally, torsional fatigue test and vibration test of the Aluminum/Composite hybrid shaft were performed, and it has been found that this method might be used effectively in manufacturing of the co-cured Aluminum/Composite hybrid propeller shaft to improve the dynamic torque characteristics.