Numerical Simulation of Helmeted Headform Drop Test Based on the EN1078 Standard

Abstract:

The shock absorption test of the EN1078 standard is the focal point of this study. These performances are to setup a shock absorbing system for commercially available helmet, to measure the key parameters when an instrumented helmeted headform drops onto anvils. In this test, the helmet quality is assessed by measuring the acceleration time history of a headform during a helmeted headform impact. Helmet quality is expressed in terms of the injury parameters: maximum resultant linear headform acceleration of the headform's center of gravity and Head Injury Criterion (HIC). Besides, the present study performs to develop and validates a finite element of helmeted headform impact test. The FE model obtains by the scanned shapes of a bicycle helmet. The headform and anvil design in accordance with EN 960: 2006 and the EN1078 specification, respectively. This study performs finite element analyses of helmet impact tests using LS-DYNA software. The results of the present method fit the experimental results well, implying that the numerical method is a practical approach to helmet design problems. Furthermore, the helmet test model proposed here has potential for guiding the future development of helmet technologies.

• Periodical: Applied Mechanics and Materials (Volumes 644-650)
• Pages: 798-802
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.644-650.798
• Online since: September 2014
• Authors: Ching Yu Hsu*, Tso Liang Teng, Cho Chung Liang, Wu Chang Kuo, Chien Jong Shih, Van Hai Nguyen
• Keywords: Bicycle Helmet, En 1078, Headform, Impact Test, Simulation

References

[1] Margaret M. Dorsch, Alistair J. Woodward, Ronald L. Somers, Do bicycle safety helmets reduce severity of head injury in real crashes?, Accident Analysis & Prevention, Volume 19, Issue 3, Pages 183–190, June (1987).

DOI: 10.1016/0001-4575(87)90002-9

[2] Collins BA, Langley JD, Marshall SW, Injuries to pedal cyclists resulting in death and hospitalization, The New Zealand Medical Journal [1993, 106(969): 514-516].

[3] Di Landro, L.; Sala, G.; Olivieri, D, Deformation mechanisms and energy absorption of polystyrene foams for protective helmets, Polymer Testing, Volume: 21, Issue: 2, 2002, pp.217-228.

DOI: 10.1016/s0142-9418(01)00073-3

[4] Mills, N.J.; Gilchrist, A., Oblique impact testing of bicycle helmets, Int J Impact Eng Volume: 35, Issue: 9, September, 2008, pp.1075-1086.

DOI: 10.1016/j.ijimpeng.2007.05.005

[5] De-Shin Liua, Chia-Yuan Changa, Chin-Ming Fanb, Shu-Lin Hsub , Influence of environmental factors on energy absorption degradation of polystyrene foam in protective helmets , Engineering Failure Analysis, Volume: 10, Issue: 5, October, 2003, pp.581-591.

DOI: 10.1016/s1350-6307(03)00040-2

[6] EN 960: 2006, Headform for use in the testing of protective helmet.

[7] BSEN 1078. Helmets for pedal cyclists and for users of skateboards and roller skates. British Standards Institution, London.

DOI: 10.3403/01057451