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Title:

PENDULUM TESTS USING RIGID AND CRUSHABLE BUMPERS

Accession Number:

00139249

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309024765

Abstract:

The test program discussed in this paper consisted of 19 tests of a breakaway sign support using a 2,000-lb (907-kb) pendulum mass impacting the support at 20 mph (32 km/h). Use of both rigid and crushable bumpers permitted examination of these techniques compared with current momentum change criterion. In addition, the effects of bolt-tightening torque on the slip-base release loads were investigated. Hi-Lok frangible nuts, which control tightening torque, were also evaluated for the design torque condition. Only in the crushable bumper tests were dramatically different results obtained for the various nut-tightening torques when momentum change was used as the criterion. Momentum change with the hard bumper was 65 plus minus 15 lbf-sec (289 plus minus 67 N-s) for all base-nut torque levels. Momentum change with the crushable bumper ranged from 88 lbf-sec (391 N-s) for design torque condition to 398 lbf-sec (1770 N-s) for the overtorqued condition. Repeatibility of slip-base loads was generally good when both a calibrated torque wrench and the Hi-Lok torque control nuts were used. It was concluded that momentum-change criterion is insufficient in evaluating results of pendulum tests using a rigid bumper. Use of a bumper with vehicle crush characteristics appears to provide a superior experimental evaluation. /Author/

Supplemental Notes:

Publication of this paper sponsored by Committee on Safety Appurtenances. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Title:

Vehicle barrier systems

Monograph Accession #:

01411424

Authors:

Bronstad, M E
Michie, J D
White, R R

Pagination:

pp 56-64

Publication Date:

1976

Serial:

Transportation Research Record

Issue Number: 566
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

54th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia
Date: 1975-1-13 to 1975-1-17

ISBN:

0309024765

Media Type:

Print

Features:

Figures (13) ; Photos; References (3) ; Tables (2)

Uncontrolled Terms:

Fragmentation

Subject Areas:

Highways; Safety and Human Factors; Vehicles and Equipment

Files:

TRIS, TRB

Created Date:

Sep 4 1976 12:00AM

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