Effect of crushable blockouts on a full-scale guardrail system

Sassi, Sadok; Sassi, Abdelmonaam; Ghrib, Faouzi

doi:10.1080/13588265.2016.1223525

Cited by 5 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The calculations used for the different parameters have been described in detail in a separate study. 14 To validate the post–soil interaction, a series of dynamic tests conducted by Coon 22 were used. The dynamic test consisted of an instrumented rigid impactor of 946 kg traveling at speed V and impacting the post 55 cm above the ground.…”

Section: Modeling Methodologymentioning

confidence: 99%

“…Consequently, a trade-off between accuracy and computation time is needed. Sassi et al 14 evaluated three mesh sizes for the post and the W-beam based on a qualitative evaluation of the interaction between the pickup and the guardrail beam. The results showed that any coarse mesh (60 or 80 mm) offered less compliance with the guardrail system and led to undesirable truck kinematics and penetration of the guardrail beam.…”

Section: Modeling Methodologymentioning

confidence: 99%

“…A satisfactory agreement was noticed in a comparison of the simulation and the experimental results. Sassi et al 14 used a calibrated FEM of a guardrail to examine the effect of replacing the non-compressible wood blockouts with three longitudinal tubes sandwiched between two plates and triggered at the four faces. The simulation results indicated that the proposed crushable blockout improved the vehicle’s speed performance and enhanced its safety and stability by reducing the model vehicle’s roll angle and the damage to the W-beam compared with the baseline.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of tire blowout on the collision of a light pickup truck with a guardrail safety barrier

Sassi

Tarlochan

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

View full text Add to dashboard Cite

This main purpose of this work is to investigate, through a finite-element simulation, the effect of tire blowout on the collision of a light pickup truck with a guardrail, at a speed of 100 km/h. The finite-element model was calibrated against a dynamic test carried out by the Texas Transportation Institute. Four cases of individual tire blowout were considered. Among these, the case of the left front tire was found to be the most critical one, resulting in a pitch angle of 24°, a roll angle of 12°, and a yaw angle of 30°. For this critical case, the results showed that the deflated tire trapped in the guardrail, which created more interaction between the vehicle and the guardrail beam. These challenging crash conditions were found to be more crucial for the stability of the pickup compared with the fully inflated tire scenario.

show abstract

Section: Modeling Methodologymentioning

confidence: 99%

Section: Modeling Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of tire blowout on the collision of a light pickup truck with a guardrail safety barrier

Sassi

Tarlochan

2019

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although most parts of the simplified model were roughly modeled, it has been widely used in many studies (Atahan, 2002; Reid et al, 2009). The model was cleaned from its intersections and penetrations then updated to include more realistic parameters for the suspension, seats, and tires (Sassi et al, 2017). The parameters of this model’s physical system are shown in Table 5.…”

Section: Numerical Validationmentioning

confidence: 99%

“…where [ K ] is the stiffness matrix, [ C ] is the damping matrix, [ M ] is the mass matrix, { q } is the displacement vector, and { F ( t ) } are the force vectors. The detailed composition of the matrices is thoroughly explained in Sassi et al (2017) and Sassi and Sassi (2015).…”

Section: Numerical Validationmentioning

confidence: 99%

Magnetorheological damper with external excitation for more efficient control of vehicles’ dynamics

Sassi

Cherif³

et al. 2018

Journal of Intelligent Material Systems and Structures

Self Cite

View full text Add to dashboard Cite

This article presents a new concept design for magnetorheological dampers, where the excitation circuit and magnetic field are applied from outside the magnetorheological chamber. This magnetorheological damper was designed and built to decrease the intrusive manufacturing operations and to maximize the working efficiency. The experimental tests made on the first prototype featuring this new technology was promising. The excitation of a set of 12 coils surrounding the body of the damper, by an electric current of 5 A, managed to increase the damping coefficient by up to 75%. A similar performance could be obtained by a current 9.4 times lower if the magnetic circuit is designed correctly. Compared to other devices, the actual design tolerates more the temperature elevation caused by the feeding of coils with high-intensity current, just because the heat is radiated outwards instead of being transferred directly to the magnetorheological fluid like in conventional designs. Finally, the numerical simulations made on Matlab show that the new magnetorheological damper, when mounted on a commercial vehicle, can considerably enhance its dynamic behavior and bring it back quickly to its stable position when the tires hit a bump on the road.

show abstract

Crash testing and evaluation of W-beam guardrail using finite elements method

Gheres

Scurtu

2022

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

On public roads, the guardrails represent the most used passive protection devices in the case of road accidents. Their role is to absorb the car impact energy. This paper presents and analyses tests of a W-beam guardrail type placed on the roadside using the finite element method. The introduction of the paper presents the state of the art, the requirements and the standards used for guardrails testing and crash test methods. In the second part of the paper is achieved the CAD model of the parapet and the impactor used to create the crash test. In the third part of this study, the boundary conditions of the guardrail structure and impactor are created for two cases of speed (80 and 110 km/h) at 20 degrees angles of impact, according to the SR EN 1317 standard. The fourth part proposes a new guardrail model changed by adding a new shock-absorber element and the distance between the poles is increased after visualization and interpretation of the obtained results of the guardrail structure. The new guardrail structure is tested at the same boundary condition as the base structure. The conclusions are highlighted in the last part of the study.

show abstract

Effect of crushable blockouts on a full-scale guardrail system

Cited by 5 publications

References 14 publications

Influence of tire blowout on the collision of a light pickup truck with a guardrail safety barrier

Influence of tire blowout on the collision of a light pickup truck with a guardrail safety barrier

Magnetorheological damper with external excitation for more efficient control of vehicles’ dynamics

Crash testing and evaluation of W-beam guardrail using finite elements method

Contact Info

Product

Resources

About