ISO TECHNICAL REPORT TR 13219 First edition 1995-05-15 Road vehicles --- Risk of thoracic injury associated with Hybrid Ill sternal deflection due to shoulder belt loading Véhicules routiers -- Risque de blessure au thorax associee a la deflexion du sternum de I'Hybrid lli due a la charge de la ceinture d'épaule [SO Reference number ISO/TR13219:1995(E) Copyright International Organization for Standardization networking permitted without license from IHS Not for Resale ISO/TR13219:1995(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmentai and non-governmentai, in liaison with iso, also take part in the work. IsO collaborates closely with the international Eiectrotechnical Commission (lEC) on aif matters of electrotechnical standardization. The main task of technical committees is to prepare International Standards, but in exceptional circumstances a technical committee may propose the publication of a Technical Report of one of the following types : - type 1, when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts ; - type 2, when the subject is still under technical development or where for any other reason there is the future but not immediate possibility of an agreement on an International Standard ; - type 3, when a technical committee has collected data of a different kind from that which is normally published as an International Standard ("state of the art", for example). Technical Reports of types 1 and 2 are subject to review within three years of publication, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid or useful. ISO/TR 13219, which is a Technical Report of type 3, was prepared by Technical Committee IsO/TC 22, Road vehicles, Subcommittee 12, Restraint systems. This document is being issued as a type 3 Technical Report for the reasons given in the Introduction. CISO1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized inanyfom orby anymeans,electronic or mechanical, including photocopying and microfilm,withoutpermission inwritingfromthepublisher Printed inSwitzerland ii Copyright Intemational Organizationfor Standardizatic Not for Resale @ISO ISO/TR 13219:1995(E) Introduction A diagonal shoulder belt is used in many vehicle restraint systems to restrain the torso of the occupant during collisions. In most accidents, the shoulder belt provides excellent restraint. However, if the goal of the restraint engineer is to optimize the design of the shoulder belt to reduce the risk of belt- induced thoracic injuries. To assess this risk, restraint system tests are conducted that simulate various sternal deflection is used as the measure of thoracic injury risk. For a given simulated collision severity, the belt restraint design that gives the lowest sternal deflection is judged to have the lowest risk of inducing thoracic injury. Mertz et al [3] conducted a study to develop a relationship between the risk of significant thoracic injury (Ais ≥ 3) and Hybrid tll sternal deflection for shoulder belt loading. An analysis was made of Association Peugeot-Renault accident data [4] of occupants who were restrained by three-point belt systems that used a shoulder belt with a force-limiting stitching. For 342 of these occupants, the magnitude of the shoulder belt load could be estimated from the amount of force-limiting stitching stitching tearing. A linear relationship existed betwee