Numerical analysis of an H4a heavy containment level transition

Atahan, Ali Osman; Bonin, Guido

doi:10.1504/ijhvs.2006.010587

Cited by 6 publications

(8 citation statements)

References 2 publications

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“…Since containers are expected to sustain large plastic deformations and possible crushing, a piecewise linear plastic material definition was used to model the LLDPE elements [11,12]. Since no failure is expected in steel members, a rigid material modeling was used to represent plates and cables.…”

Section: Finite Element Model Of Ucc Designmentioning

confidence: 99%

Impact Performance Evaluation of a Crash Cushion Design Using Finite Element Simulation and Full-Scale Crash Testing

Buyuk

Atahan

Kurucuoğlu³

2018

Safety

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Crash cushions are designed to gradually absorb the kinetic energy of an impacting vehicle and bring it to a controlled stop within an acceptable distance while maintaining a limited amount of deceleration on the occupants. These cushions are used to protect errant vehicles from hitting rigid objects, such as poles and barriers located at exit locations on roads. Impact performance evaluation of crash cushions are attained according to an EN 1317-3 standard based on various speed limits and impact angles. Crash cushions can be designed to absorb the energy of an impacting vehicle by using different material deformation mechanisms, such as metal plasticity supported by airbag folding or damping. In this study, a new crash cushion system, called the ulukur crash cushion (UCC), is developed by using linear, low-density polyethylene (LLDPE) containers supported by embedded plastic energy-absorbing tubes as dampers. Steel cables are used to provide anchorage to the design. The crashworthiness of the system was evaluated both numerically and experimentally. The finite element model of the design was developed and solved using LS-DYNA (971, LSTC, Livermore, CA, USA), in which the impact performance was evaluated considering the EN 1317 standard. Following the simulations, full-scale crash tests were performed to determine the performance of the design in containing and redirecting the impacting vehicle. Both the simulations and crash tests showed acceptable agreement. Further crash tests are planned to fully evaluate the crashworthiness of the new crash cushion system.

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Section: Finite Element Model Of Ucc Designmentioning

confidence: 99%

Impact Performance Evaluation of a Crash Cushion Design Using Finite Element Simulation and Full-Scale Crash Testing

Buyuk

Atahan

Kurucuoğlu³

2018

Safety

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“…Since a barrier is expected to sustain large plastic deformations and possible crushing during vehicle impact, a piecewise linear plastic material definition was used to model the steel Safety 2018, 4, 50 5 of 11 members [13,14]. Failure is included in the model to capture any potential rail ruptures.…”

Section: Description Of Finite Element Modelsmentioning

confidence: 99%

“…The behavior of the connections was examined under different loading conditions. A reasonable failure criterion obtained from the component simulation was used in the connection model [14].…”

Section: Description Of Finite Element Modelsmentioning

confidence: 99%

“…Safety 2018, 4, x 5 of 11 [13,14]. Failure is included in the model to capture any potential rail ruptures.…”

Section: Description Of Finite Element Modelsmentioning

confidence: 99%

“…On the other hand, the concrete was modeled with a rigid material approximation since no failure is expected in concrete during a crash event. Safety 2018, 4, x 5 of 11 [13,14]. Failure is included in the model to capture any potential rail ruptures.…”

Section: Description Of Finite Element Modelsmentioning

confidence: 99%

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Traffic Safety at Median Ditches: Steel vs. Concrete Barrier Performance Comparison Using Computer Simulation

Yucel

Atahan

Arslan

et al. 2018

Safety

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In Turkey, concrete V-shaped ditches are formed at the median section of divided highways to provide drainage. Recent accidents show that these ditches actually present safety risks to vehicles entering the medians. Vehicles either cross over the ditch, roll over, or become trapped in the ditch, depending upon the mass, size, speed, and angle of the entering vehicle. To overcome this safety risk and reduce the severity of these accidents, longitudinal barriers are installed along these ditches. Currently, in Turkey, steel barriers are extensively used to improve traffic safety at median ditches. In this paper, the crash performances of steel and concrete barriers used at medians with ditches are compared. A model of a standard steel EDSP-1.33 barrier and a model of a newly developed concrete C470 barrier were constructed, and impact simulations were performed for when they are installed at a ditch slope break point. A nonlinear finite element program, LS-DYNA, was used for the analysis. A 13,000 kg bus model was used to impact both barriers in accordance with European standard requirements for crash tests. Simulation results show that when the steel EDSP-1.33 barrier is used, the bus has the potential for excessive penetration of the ditch, with significant barrier deformation. Moreover, the barrier damage is extensive, resulting in increased maintenance costs. On the other hand, the concrete C470 barrier successfully contains and redirects the 13,000 kg bus impact, with minimal barrier deformation and safety risk. Even though the concrete barrier slides toward the inside of the ditch, the bus does not enter the ditch area and exits the barrier in a stable manner. Therefore, to increase traffic safety at ditches located at the median section of divided highways in Turkey, utilization of the newly developed concrete barrier C470 is recommended.

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Crashworthiness analysis of a bridge rail-to-guardrail transition

Atahan

2016

International Journal of Crashworthiness

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Numerical analysis of an H4a heavy containment level transition

Cited by 6 publications

References 2 publications

Impact Performance Evaluation of a Crash Cushion Design Using Finite Element Simulation and Full-Scale Crash Testing

Impact Performance Evaluation of a Crash Cushion Design Using Finite Element Simulation and Full-Scale Crash Testing

Traffic Safety at Median Ditches: Steel vs. Concrete Barrier Performance Comparison Using Computer Simulation

Crashworthiness analysis of a bridge rail-to-guardrail transition

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