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A Study of Strength Property and Durability on Automotive Front Bumper Guard by Configuration
Moon-Sik Han(한문식),Jae-Ung Cho(조재웅) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.3
The automotive front bumper guard is the most important part of the vehicle for protecting the life of driver when a traffic accident happens. In order to ensure safe driving, this part must possess sufficient strength and durability. This study was carried out with structural and fatigue analyses by designing front bumper guard models. After the lowest value for maximum total deformation and equivalent stress was found through structural analysis and the highest value for fatigue life was found for all three models, it was shown that the type C front bumper guard model was the most suitable for application to a real car. The strength property and durability of the optimum design were determined through this study"s results.
한문식(Moon Sik Han),조재웅(Jae Ung Cho) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.1
In this study, the safest model can be selected by the simulation result of structural safety analysis according to the shape of impact bar affected at side door of automobile. The open sectional model of semicircle type has the lowest deformation and stress among 4 kinds of models. As the weight of this model has 30% in comparison with other models, it becomes most economical and stable. As the open sectional model of cap type the highest deformation and stress among 4 kinds of models, it becomes weakest. The closed models with circular and rectangular types has the stress far lower than cap type. The maximum deformation is shown at the center part of impact bar but the maximum stress occurs at the joint part between impact bar and frame.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.1
This study investigates structural and fatigue analyses at bicycle pedal. Maximum deformation at model 1 is 2 times as much as model 2 at static analysis. Models 1 and 2 have the possibility of the weakest strength at the part of contact with chain gear. Among the cases of nonuniform fatigue loads at Models 1 and 2, ‘SAE bracket history’ with the severest change of load becomes most unstable but ‘Sample history’ becomes most stable. In case of ‘Sample history’ with the average stress of 0 to -10 4 MPa and the amplitude stress of 0 to 10 4 MPa, the possibility of maximum damage becomes 4%. This stress state can be shown with 5 to 7 times more than the damage possibility of ‘SAE bracket history’ or ‘SAE transmission’. The analysis result of this study can be effectively utilized with the safe design of pedal.
한문식(Moon Sik Han),조재웅(Jae Ung Cho) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
Hydraulic excavator in digging at the construction machinery is a widely used mechanical device. Excavator attachments are taken with structural load and fatigue during digging under applied reaction. Fatigue analysis is done at joint pin between bucket and arm of front attachment at excavator under the force of hydraulic cylinder in operation. It is analyzed how load can be supported at the lower driving body applied on the bucket. In this study, the deformation of arm and the fatigue result are examined when reaction force is applied on the attachment of excavator.
한문식(Moon Sik Han),조재웅(Jae Ung Cho) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
This study analyzes about the variation of pressure and stream velocity according to the movement of tail wing. The pressure at the front part of airplane becomes lower than at the rear part and the stream velocity has decreased by being bumped against the wing of airplane. The pressure at the front part of rudder becomes higher than at its rear part according to the movement of rudder among the tail wings of airplane. The more stream velocity becomes decreased, the more rudder spreads out. As the tail wing of airplane folds, the pressure at its front part becomes higher. And the pressure at its rear part becomes lower than at its front part. The more tail wing of airplane folds, the more stream velocity becomes decreased.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.2
This study aims at the structural safety with optimum design of automotive bumper in order to minimize the maximum stress and displacement and reduce the minimum quantity of bumper material. As the forces of X and Y direction increase, equivalent stress and displacement increase. The displacement of X direction force increases more than 20% in comparison with Y direction force. But the equivalent stress of Y direction force increases more than 60% in comparison with X direction force. The mass of inner bumper becomes minimum and the mass of outer bumper becomes maximum when the force of 4000N is applied on the direction inclined at 45° toward outer bumper. In 50% range of increase and decrease at X and Y direction force, the optimum forces of X and Y component becomes 2368.8N and 1538.8N respectively. And the masses of inner and outer polypropylene bumper become 3.3227×10<SUP>-2</SUP>㎏ and 3.5538×10<SUP>-2</SUP>㎏ respectively.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
This study aims at structural analysis with fatigue on the shock absorber mount of automobile. Two kinds of mount as original model 1 and reinforced model 2 are applied. Among the cases of nonuniform fatigue loads at both models, ‘SAE bracket history’ with the severest change of load becomes most unstable but ‘Sample history’ becomes most stable. In case of ‘SAE bracket history’ or ‘SAE transmission’, the maximum fatigue life at model 2 is 5 to 6 times as much as model 1 and the minimum damage at model 2 is decreased 5 to 6 times as much as model 1. In case of ‘Sample history’ as slow fatigue loading history, the minimum damage at model 2 becomes same as model 1 but the maximum fatigue life at model 2 is decreased more than 17 times as much as model 1. In case of ‘Sample History’ with the average stress of -104MPa to 104MPa and the amplitude stress of 0MPa to 104MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 times more than the damage possibility of ‘SAE bracket history’ or ‘SAE transmission’. Safe and durable design of shock absorber can be effectively improved by using this study result on mount frame.
한문식(Moon-Sik Han),조재웅(Jae-Ung Cho) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.5
This study analyzes about front axle through the analyses of stress, fatigue and vibration. Maximum equivalent stress is shown with the frequency of 60㎐ in case of the harmonic vibration analysis applied with force. Among the cases of nonuniform fatigue loads, ‘SAE bracket history’ with the severest change of load becomes most unstable but ‘Sample history’ becomes most stable. In case of ‘Sample history’ with the average stress of 0 to -2×105㎫ and the amplitude stress of 0 to -2.5×105㎫, the possibility of maximum damage becomes 3%. This stress state can be shown with 6 times more than the damage possibility of ‘SAE Bracket history’ or ‘SAE transmission’. The structural result of this study can be effectively utilized with the design of front axle by investigating prevention and durability against its damage.