Wooden Pole Fracture Energy in Vehicle Impacts

Paper #:
  • 980214

Published:
  • 1998-02-23
Citation:
Kent, R. and Strother, C., "Wooden Pole Fracture Energy in Vehicle Impacts," SAE Technical Paper 980214, 1998, https://doi.org/10.4271/980214.
Pages:
16
Abstract:
Impacts with trees and wooden utility poles represent a significant subset of vehicular collisions. For example, while fixed object collisions account for less than 8% of all crashes, they represent nearly 30% of all fatal crashes. Also, nearly half (over 43%) of all fixed-object impacts are into a tree, pole, or post. This paper is viewed as a first attempt to understand the energy absorbing processes operating when vehicles strike trees and wooden poles in order to make reasonable estimates of the magnitude of the tree/pole energy dissipated in the crash. This initial study is comprised of a literature review, a series of scale model pole/pendulum impacts, and an analytical study which is comprised of both a static analysis and a dynamic finite element model (FEM) analysis of a vehicle/pole impact. As a result of this work, a methodology has been evolved for making estimates of tree/pole energy. This methodology considers whether or not the struck object was displaced in its moorings and/or partially or completely fractured by the impact.
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