저속 충돌에 의한 자동차 범퍼의 파손에 대한 유한요소 해석
A Finite Element Analysis on Damage of Automotive Bumper due to Impact of Low Speed
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초록
The automotive bumper has the functions of strength, rigidity and fine sight. It protects the driver,front and rear sides of car body through shock absorption at the traffic accident of car. This studyinvestigates the impacts on front side and corner with the low speed of 4.5 km/h by using the model ofSUV car body. The models are modelled by CATIA program with three dimensions and are analyzed bythe finite element program of ANSYS Explicit STR. The maximum equivalent stresses at impacts offront side(case 1) and corner (case 2) at bumper are 261.72MPa and 365.02MPa respectively. As thisstress at case 2 becomes 40% higher than at case 1, the impact of corner is happened easier than at thedamage at the impact of front side. These stresses at case 1 and case 2 are shown above the yieldstress at material property of steel, it is thought that there are the possibilities of plastic damages at twocases. The maximum deformation and equivalent stress at the support 2 of case 2 become 5 times and 3times higher than at the support 1 respectively. The damage possibility due to impact at low speed isinvestigated by the basic analysis result of this study. And this result can be utilized at inspecting theresult of impact test on bumper hereafter.
Abstract
The automotive bumper has the functions of strength, rigidity and fine sight. It protects the driver,front and rear sides of car body through shock absorption at the traffic accident of car. This studyinvestigates the impacts on front side and corner with the low speed of 4.5 km/h by using the model ofSUV car body. The models are modelled by CATIA program with three dimensions and are analyzed bythe finite element program of ANSYS Explicit STR. The maximum equivalent stresses at impacts offront side(case 1) and corner (case 2) at bumper are 261.72MPa and 365.02MPa respectively. As thisstress at case 2 becomes 40% higher than at case 1, the impact of corner is happened easier than at thedamage at the impact of front side. These stresses at case 1 and case 2 are shown above the yieldstress at material property of steel, it is thought that there are the possibilities of plastic damages at twocases. The maximum deformation and equivalent stress at the support 2 of case 2 become 5 times and 3times higher than at the support 1 respectively. The damage possibility due to impact at low speed isinvestigated by the basic analysis result of this study. And this result can be utilized at inspecting theresult of impact test on bumper hereafter.
참고문헌 (7)
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