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Response of a helmet liner under biaxial loading
University of Padova, Italy.
RISE - Research Institutes of Sweden, Materials and Production, SICOMP.ORCID iD: 0000-0002-2627-3280
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.ORCID iD: 0000-0002-2841-7188
University of Padova, Italy.
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2018 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 72, p. 110-114Article in journal (Refereed) Published
Abstract [en]

Helmets are the most effective protective item for motorcyclists. The liner of the helmet is the part of the helmet which dissipates most of the impact energy and mitigates the risk of head injuries. It has been proposed that the helmet test standards should include assessment of the helmets for oblique impacts that is not currently addressed in the standards. A conventional uniaxial compression test method is still used for characterization of the helmet liner material. However, compressive tests of EPS foams provide reliable results for normal loading on EPS, but do not provide a realistic result for oblique impacts. Therefore, we carried out experimental tests to measure the response of EPS foams, which are commonly used for helmet liners, under biaxial loading. The result of our experiments show that the shear response of EPS foams is a function of axial compression, and increasing the axial strain leads to increased shear stiffness, and thus higher levels of shear stress. We also showed that including shear-stiffening of EPS in the FE assessment of helmets may change the headform rotational acceleration by 25%. Therefore, such behavior of EPS foams should be included in FE analysis of helmets in the case of oblique impacts for a more realistic assessment of their performance.

Place, publisher, year, edition, pages
2018. Vol. 72, p. 110-114
Keywords [en]
Biaxial mechanical response, EPS, Helmet, Oblique impact, Compression testing, Safety devices, Shear stress, Compressive tests, Experimental test, Mechanical response, Reliable results, Rotational acceleration, Uni-axial compression tests, Accident prevention
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-35573DOI: 10.1016/j.polymertesting.2018.10.012Scopus ID: 2-s2.0-85054874584OAI: oai:DiVA.org:ri-35573DiVA, id: diva2:1261688
Note

 Funding details: FP7-PEOPLE-2013-ITN-608092, REA, Research Executive Agency; Funding text: The research leading to these results has received funding from the People Programme (Marie Sklodowska Curie Actions) of the European Union’s Seventh Framework FP7/2007-2013/under REA grant agreement n° [ FP7-PEOPLE-2013-ITN-608092 ] and from the ECCELLENZA programme of the CARIPARO foundation under the REDIPhE project.

Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2019-06-28Bibliographically approved

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Olsson, RobinWysocki, Maciej

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