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Analysis of the car impact on the traffic sign.
Last modified: 20. 12. 2022
Abstract
The paper deals with solving the problem of a car crashing into a road sign. The essential issue is the safety of the transported passengers. The satisfaction of this feature is guaranteed by a small resistance of the sign to impact loading, i.e. vehicle with low speed must destroy the barrier. Therefore, according to the technical regulations, a car with a speed of 35 km/h must break through the road sign.
The computational solution to the problem consists of two approaches. The first approach comprises modelling the collision of the vehicle with a barrier. In that case, the computation involves the preparation of the vehicle and the barrier models and subsequent contact problem solutions. The second approach incorporates an investigation of the energy value required to break through the barrier and a following comparison of the computed energy with the kinetic energy of the vehicle before the collision. The preparation includes only the modelling of the barrier. The problem is solved using the FE software ADINA with transient dynamic analysis. The material model was multilinear with a fracture. During the creation of the model with these properties is formed a plastic region. After exceeding the ultimate strength is created a fracture, which propagates through the material. The last step involves the calculation of the energy required to break through the sign and an assessment of whether a moving vehicle will break through the obstacle.
The computational solution to the problem consists of two approaches. The first approach comprises modelling the collision of the vehicle with a barrier. In that case, the computation involves the preparation of the vehicle and the barrier models and subsequent contact problem solutions. The second approach incorporates an investigation of the energy value required to break through the barrier and a following comparison of the computed energy with the kinetic energy of the vehicle before the collision. The preparation includes only the modelling of the barrier. The problem is solved using the FE software ADINA with transient dynamic analysis. The material model was multilinear with a fracture. During the creation of the model with these properties is formed a plastic region. After exceeding the ultimate strength is created a fracture, which propagates through the material. The last step involves the calculation of the energy required to break through the sign and an assessment of whether a moving vehicle will break through the obstacle.
This work was supported by VEGA 1/0073/19 and KEGA 054ŽU-4/2021.