Protective Performance of the Operator's Helmet for Wheel Loader in the Rollover Accident

Abstract:

This paper is devoted to study of the helmets which can provide protection for the operator against head injury during an rollover accident. In the present study, the proposed procedure is demonstrated with the help of a validated madymo model of a featureless Hybrid Ⅲ headform in conjunction with a helmet model comprising an outer polypropylene shell to the inner surface of which is bonded a protective polyurethane foam padding of a given thickness, a parametric analysis has been performed in order to investigate the effect of different densities and thickness of the polyurethane foam on the head injury during impact. Based on simulation results of impact on a rigid surface, it appears that a minimum foam padding thickness of 15 mm is necessary for obtaining an acceptable value of HIC(d). The HIC(d) value decreases as an increase of the foam thickness, and the effect of the foam density variable is nonlinear, a second order parabolic shape can be identified.

• Periodical: Advanced Materials Research (Volume 346)
• Pages: 471-476
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.346.471
• Online since: September 2011
• Authors: Jun De Si, Guo Qiang Wang, Ying Shuang Zhang, Wan Jun Hao
• Keywords: Crash Simulation, Dynamic Response, Head Impact, Helmets, Polyurethane Foam

References

[1] D P Thambiratnam, F. ASCE, B J Clark, et al. Performance of a rollover protective structure for a bulldozer[J]. Journal of Engineering Mechanics, 2009, 135(1): 31-40.

DOI: 10.1061/(asce)0733-9399(2009)135:1(31)

[2] Albertsson P, Falkmer T, Kirk A, et al. Case study: 128 injured in rollover coach crashes in Sweden—Injury outcome, mechanisms and possible effects of seat belts[J]. Safety Science, 2006, 44(2): 87－109.

DOI: 10.1016/j.ssci.2005.07.005

[3] Michael McCann. Heavy equipment and truck-related deaths on excavation work sites[J]. Journal of Safety Research. 2006, 37: 511-517.

DOI: 10.1016/j.jsr.2006.08.005

[4] Timothy R. Driscoll, James E. Harrison, Clare Bradley et al. The role of design issues in work-related fatal injury in Australia [J]. Journal of Safety Research, 2008, 39: 209-214.

DOI: 10.1016/j.jsr.2008.02.024

[5] Deb A, Chou C C. Headform Impact Safety Design Through Simulation and Testing[C]. SAE Paper No. 2003-01-1386.

DOI: 10.4271/2003-01-1386

[6] Sopher S R. Recent Developments in Occupant Protection Interior Component Design and Construction Utilizing Advanced Expanded Polyolefin Bead Foam Materials[C]. SAE Paper No. 2005-01-0976.

DOI: 10.4271/2005-01-0976

[7] Burr S T, Vogel G D. Material Model Development for Impact Analysis of Oriented Polypropylene Foam Structures[C]. SAE Paper No. 2001-01-0310.

DOI: 10.4271/2001-01-0310

[8] Belingardi G, Duella R, Caminiti A. Optimal Choice of the Foam Design Parameters in Order to Meet the HIC Index Limit of the FMVSS201 Standard[C]. SAE Paper No. 2002-01-(2095).

DOI: 10.4271/2002-01-2095

[9] Pinnoji P K, Mahajan P, Bourdet N, et al. Impact dynamics of metal foam shells for motorcycle helmets: Experiments & numerical modeling[J]. International Journal of Impact Engineering, 2010, 37(3): 274－284.

DOI: 10.1016/j.ijimpeng.2009.05.013

[10] TNO road-vehicle research institute. Madymo Manuals version 7. 1[M], (2009).

[11] Chou C C, Huang Y Z, Lim G G. Development and validation of a deformable featureless head form model using LS-DYNA3D[C]. 15th Int Tech Conf Enhanced Safety of Vehicles, Melbourne, Australia., 1996: 13－16.

[12] Wei Xiuling. Study on the Performances of the Operator Protection System for Off-road Vehicles in Rollover Accident[D]. Changchun: Jilin University, 2009. (in Chinese with English abstract).

[13] Deb A, Chou C C, Barbat S D. An Analytical Study on Headform Impact Protection Space for a Rigid Target[C]. SAE Paper No. 2000-01-0608.

DOI: 10.4271/2000-01-0608