Title: Comparison of load transfer index (U*) with conventional stress analysis in vehicle structure design evaluation

Authors: Khashayar Pejhan; Christine Q. Wu; Igor Telichev

Addresses: Mechanical Engineering Department, University of Manitoba, 66 Chancellors Cir, Winnipeg, MB, R3T 2N2, Canada ' Mechanical Engineering Department, University of Manitoba, 66 Chancellors Cir, Winnipeg, MB, R3T 2N2, Canada ' Mechanical Engineering Department, University of Manitoba, 66 Chancellors Cir, Winnipeg, MB, R3T 2N2, Canada

Abstract: The load transfer index (U*), is a relatively new concept compared to its counterpart of structural stress analysis. The U*index characterises the internal stiffness distributions, which indicates the load transferring function of the prospective structure. Although the U* index and stress values have been proven to be useful indices in design, a systematic comparison between the conventional stress analysis and the loads transfer analysis (based on U*index) is lacking. In this study, using a component of the parcel rack from multiple passenger vehicles as an example, we demonstrate the unique capability of U*, indicating the load transferring function. We further show how the combination of the load index U* and the stress distributions provides a comprehensive understanding of the structure's response to various loading conditions. More importantly, we will discuss how the U* can provide unique guidelines for structure design with the purpose of improving the load transfer capacity and reducing the weight.

Keywords: load transfer index; U* index; load transfer analysis; load path; design evaluation; stress analysis; vehicle structure; structural design; vehicle design.

DOI: 10.1504/IJVD.2015.071088

International Journal of Vehicle Design, 2015 Vol.68 No.4, pp.285 - 303

Received: 12 Apr 2014
Accepted: 14 Oct 2014

Published online: 12 Aug 2015 *

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