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  • Standard Guardrail Impact Simulation of Pickup and Sedan Vehicle

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Standard Guardrail Impact Simulation of Pickup and Sedan Vehicle

Standard Guardrail Impact Simulation of Pickup and Sedan Vehicle

Post by: Javad Mehrmashhadi
10/06/2015
2620 views

In this project, I checked the performance of current Iranian guardrail to absorb energy in crash accidents.

 

Modeling

Modeling has been categorized into three section in this report.

1.       Vehicle modeling

2.       Guardrails and joints modeling

3.       Soil modeling

Hypermesh has been used as the main software for preprocessing tool and all simulation have been performed in LS-Dyna.

Vehicle modeling

In this simulation two vehicle model have been used, a four-door sedan and a pickup C2500.

Pickup vehicle

The complete C2500 finite element model has been used in all simulation without any modification. Modeling data are shown in the following table.

 

Number of Nodes

17626

Shell elements

15957

Total Mass

2082 kg

Number of Element

16800

Beam elements

120

Wheelbase

3360 mm

Number of Parts

102

Solid elements

546

Wheel Track

1680 mm

Number of Materials

94

Spring & Mass elements

177

Height

1840 mm

Number or Properties

94

 

 

 

 

 

The tires have been modeled with airbag simple pressure volume code and the coefficients are listed below.

Whereas the tire pressure can be calculated with the following formula:

Sedan vehicle

To evaluate the crash simulation of a sedan vehicle, a Taurus vehicle model has been used that unlike C2500, it has been modified and corrected for the simulations. The model data are listed in the table below.

Number of Nodes

26839

Shell elements

27879

Total Mass

1410 kg

Number of Element

28714

Beam elements

523

Wheelbase

2720 mm

Number of Parts

139

Solid elements

608

Wheel Track

1701 mm

Number of Materials

131

Spring & Mass and Rigid elements

1058

Height

1400 mm

Guardrail modeling

A total of nine guardrails have been assembled together with 4 bolts in each side of a rail. Both joint rails are bolted to a base that is fixed in ground. Dimension and material properties will not be published. However, modeling data are listed below.

 

Number of Nodes

54939

 

 

Number of Element

52111

Shell element

52032

Number of Parts

279

Spring element

79

Number of Materials

12

 

 

Bolts and nuts have been modeled with rigid materials connected via a spring with failure deflection that is relevant to bolts’ ultimate stress.

 

Soil modeling

The soil has been modeled with mat_soil_and_foam without any reinforcement. There are some other methods that use grout and steel in the soil while I have neglected them. Material coefficients with detail of finite element modeling can be seen in the figures below.

Number of Nodes

25744

 

 

Number of Element

29026

Shell element

8761

Number of Parts

18

Solid element

20265

Number of Materials

3

 

 

Creating contact

Totally, the contacts can be categorized according to their assemblies. Friction coefficient have been widely used in all contacts

1-      Between vehicle parts

2-      Between rail, base and vehicle

3-      Between base and soil

Loading

Vehicle is about to impact guardrails with angle of 25deg and a longitudinal velocity of 80km/hr. Furthermore, a rotational velocity has been set to tire too.

The soil lowest nodes have been considered as fixed condition and also boundary nonreflecting condition has set to soil exterior nodes.

Pickup results

 

Time 0.1s

Time 0.6s

From the figures, it can be discovered that vehicle velocity reached to 25km/h from 80km/h during 0.6sec. The pickup deviated maximum of 8 degree from longitudinal axis and had reached a peak of 5 degree in roll angle.

 

The final deformation after a 0.6 simulation can be seen in the following figures.

Sedan results

 

The whole deformation after 0.6s is shown bellow.

 

 

Sedan Impact 0 deg

The vehicle absolute pitch angle can be seen bellow. Vehicle pitched about 9deg.

 

 To see the animation of pickup model click on the following link:                                          Animation

 

 

Last modified on 17/06/2015

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Javad Mehrmashhadi

Javad Mehrmashhadi

Javad Mehrmashhadi is the owner of CAE-Solutions.

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About Me


I have been doing simulation support on variety of projects within automotive and aerospace industries as well as on civil projects since 2004. Regarding my CAE skills using LS-Dyna, ANSYS, Altair Hyperworks and ADAMS I am well able to perform simulations on the following areas:
  • Crashworhiness, Pedestrian
  • Static & Dynamic and Coupled-Field
  • Friction Stir Welding (FSW)
  • Multi-body Dynamic

Please contact me if you need technical support in your projects by sending your request to mehrmashhadi@gmail.com

Javad Mehrmashhadi

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  • Iranian Society of Automotive Engineering
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