Experimental and numerical analysis of the modified TB32 crash tests of the cable barrier system

Bruski, Dawid; Burzyński, Stanisław; Chróścielewski, Jacek; Jamroz, Kazimierz; Pachocki, Łukasz; Witkowski, Wojciech; Wilde, Krzysztof

doi:10.1016/j.engfailanal.2019.05.023

Cited by 26 publications

(19 citation statements)

References 15 publications

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“…Previous studies dealing with friction properties and/or their impact on the obtained results are subject to two distinct limitations [ 18 , 23 , 25 , 49 , 50 , 51 , 52 , 53 ]. First, the friction data are not consistent, and significantly different values of friction coefficients are assumed despite the simulation of similar problems.…”

Section: Methodology Of Numerical Simulationsmentioning

confidence: 99%

“…In [ 49 ], the authors used a Coulomb’s friction coefficient of µ = 0.25 for vehicle parts vs. steel barrier parts. By contrast, in [ 18 ], contact between the barrier and the vehicle was simulated using μ s = 0.42 and μ d = 0.10. Frictionless contact between the vehicle and guardrail was defined in [ 52 ], whereas μ s = 1.0 and μ d = 0.2 were chosen in [ 51 ] to model contact between the vehicle and barrier as well as between the vehicle and asphalt pavement.…”

Section: Methodology Of Numerical Simulationsmentioning

confidence: 99%

“…The status of numerical modeling is somewhat different for guardrails [ 13 , 18 , 19 , 20 ]. Utilization of numerical modeling of guardrail impact began in the 1980s with the development of computer programs such as GUARD and NARD [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Baranowski

Damaziak

2021

Materials

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In this paper, numerical simulations of the EN 12767 test procedure for a vehicle–lighting pole crash are presented. A representative soil–vehicle–lighting pole model is first developed. The Geo Metro vehicle model is used, and significant attention is given to representing the soil and its interaction with the traffic pole. Soil is represented using smoothed particle hydrodynamics (SPH) coupled with finite elements (FEs). A parametric study is carried out to investigate the key factors influencing the outcomes and consequently the estimation of the occupant safety levels during crash scenario described in EN 12767. First, a sensitivity study of lighting pole mesh is conducted As a result, the optimal mesh size is used for further studies regarding physical parameters such as soil properties and friction coefficient in vehicle–pole interfaces. Friction and mesh size are found to have a considerable influence on the acceleration severity index (ASI), theoretical head impact velocity (THIV), post-impact velocity and vehicle behavior during the lighting pole crash scenario.

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Section: Methodology Of Numerical Simulationsmentioning

confidence: 99%

Section: Methodology Of Numerical Simulationsmentioning

confidence: 99%

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Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Baranowski

Damaziak

2021

Materials

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“…But the methodology of numerical simulation has its own shortcomings and cannot exactly reproduce the crash process without any differences, for it is confined to algorithms and ideal conditions. Instead, the experimental methodology could incorporate more factors into the process and be used for the validation of numerical simulation [36]. Without any limitations, experimental methodology is the better way to reproduce the crash process.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Injury Potential of Three-year-old Child Occupants Caused by Inappropriate Installation of Enhanced Child Restraint System with Top Tether in Frontal Crash Accidents

Wei

2021

JERT

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Objective: Frontal crash accidents remain a significant factor in causing the preventable injury and fatality for child occupants aged 3 in China. Despite the increased public awareness and utilization of child restraint system (CRS), inappropriate installations still exist and lead to a potential to result in injuries of head, thorax and abdomen regions of child occupants, especially when it comes to enhanced child restraint system (ECRS) with top tether. The current study focuses on the influence of top tether upon safety performance of ECRS with top tether in dynamic tests with different set-ups and explores the relationship between inappropriate installation of ECRS with top tether and the injury potential of child occupants aged 3 in a frontal crash. Methods: A testing scheme including 4 dynamic tests was devised to ascertain the extent to which the top tether affected the accelerations of thorax, the abdominal penetration and the head displacements. Different kinds of acceleration curves were employed to conduct the tests and to simulate the real status and situation of child occupants aged 3 in the CRS installed with top tether and without top tether respectively. Parameters of accelerations, abdominal penetrations, and head displacements were measured to analyze quantitatively the influence of inappropriate installations of ECRS with top tether under different conditions. Results: The safety performance of ECRS with the use of top tether was found better than that of ECRS without the use of top tether either in the normal condition or in the extreme condition. The test using the acceleration curves defined by regulations, the accelerations of thorax, abdominal penetrations, and head displacements of P3 manikin in the ECRS with the top tether connected to the anchor point revealed results that all met the requirements. While in the test using acceleration curves of the same kind, and when the top tether was not connected, the parameters measured displayed that the safety performance of the sample was worse than the former one. As for the tests using the more severe acceleration curves defined at will, it was more obvious that top tether could affect the function and safety performance of ECRS greatly, and the functional failure and severe damages occurred to the ECRS without the use of top tether. ECRS with the use of top tether was partly qualified even under the more severe conditions. Conclusions: Inappropriate installation of ECRS such as omitting the step of connecting top tether to anchor point could cause severe injuries and fatalities in frontal crash accidents. Effective measures should be taken to minimize the chances of inappropriate installations of ECRS.

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“…Knowledge about this wire rope and its properties is crucial, helping to better understand and analyze vehicular impacts on cable barriers. So far, research has mainly focused on evaluations of the performance of the whole safety system [ 33 , 34 ]. To the best of the author’s knowledge, the only studies on the properties of the 3 × 7 19-mm wire rope have been published by the team led by Reid [ 20 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Bending Properties of Wire Rope Used in Cable Barrier Systems

Bruski

2020

Materials

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This paper presents research on the bending properties of 3 × 7 19-mm wire rope commonly used in road cable barriers. A total of 19 experimental tests were conducted. In addition, two nonlinear 3D numerical models of the wire rope using beam and solid finite elements were developed. Based on these models, four numerical simulations were carried out. The numerical results were validated against the experimental ones and a very good agreement was obtained. The main result of the research is the determination of the moment–curvature relationship for the wire rope considered. The effect of prestretching on the rope performance is discussed. The numerical results are analyzed in this paper in detail, including the behavior of the wire rope under bending and analyses of the cross-sectional and contact stresses. Suggestions concerning the type of finite element for wire rope modeling are also given. The results can be used, for example, in numerical simulations of crash tests of cable barriers.

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Experimental and numerical analysis of the modified TB32 crash tests of the cable barrier system

Cited by 26 publications

References 15 publications

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Numerical Simulation of Vehicle–Lighting Pole Crash Tests: Parametric Study of Factors Influencing Predicted Occupant Safety Levels

Analysis of Injury Potential of Three-year-old Child Occupants Caused by Inappropriate Installation of Enhanced Child Restraint System with Top Tether in Frontal Crash Accidents

Determination of the Bending Properties of Wire Rope Used in Cable Barrier Systems

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