Inertial effects during impact testing

John D. Reid, Jason A. Hascall, Dean L. Sicking, Ron Faller

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Shortcomings were identified in historic dynamic guardrail post testing methods that could overestimate the strength of guardrail posts by a factor of two. This inaccuracy resulted from the influence of inertia that was not previously accounted for during dynamic component testing. The effects of inertia were verified and quantified with several analysis methods including nonlinear finite element analysis, which was used to develop a computer simulation of the dynamic tests. Several alternative testing procedures that could significantly reduce the effects of inertia were identified and investigated. One of these testing alternatives-use of a crushable impact head-was shown with computer simulation to reduce the effects of inertia and maintain the benefits of strain rate effects. The use of such an impact head is recommended for all future dynamic post strength testing. The results of the study imply that changes should be made not only in the standard design procedures used for guardrail and other vehicular barriers, which are clearly influenced by inertial effects, but in all designs that are based on dynamic strength testing. Dynamic testing is very common in the field of transportation engineering and care should be taken to ensure that inertial effects are considered when performing such tests.

Original languageEnglish (US)
Pages (from-to)39-46
Number of pages8
JournalTransportation Research Record
Issue number2120
DOIs
StatePublished - Dec 1 2009

Fingerprint

Impact testing
Testing
Computer simulation
Strain rate
Finite element method

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanical Engineering

Cite this

Inertial effects during impact testing. / Reid, John D.; Hascall, Jason A.; Sicking, Dean L.; Faller, Ron.

In: Transportation Research Record, No. 2120, 01.12.2009, p. 39-46.

Research output: Contribution to journalArticle

Reid, John D. ; Hascall, Jason A. ; Sicking, Dean L. ; Faller, Ron. / Inertial effects during impact testing. In: Transportation Research Record. 2009 ; No. 2120. pp. 39-46.
@article{72e9651eeb8a46378127922a5040ef27,
title = "Inertial effects during impact testing",
abstract = "Shortcomings were identified in historic dynamic guardrail post testing methods that could overestimate the strength of guardrail posts by a factor of two. This inaccuracy resulted from the influence of inertia that was not previously accounted for during dynamic component testing. The effects of inertia were verified and quantified with several analysis methods including nonlinear finite element analysis, which was used to develop a computer simulation of the dynamic tests. Several alternative testing procedures that could significantly reduce the effects of inertia were identified and investigated. One of these testing alternatives-use of a crushable impact head-was shown with computer simulation to reduce the effects of inertia and maintain the benefits of strain rate effects. The use of such an impact head is recommended for all future dynamic post strength testing. The results of the study imply that changes should be made not only in the standard design procedures used for guardrail and other vehicular barriers, which are clearly influenced by inertial effects, but in all designs that are based on dynamic strength testing. Dynamic testing is very common in the field of transportation engineering and care should be taken to ensure that inertial effects are considered when performing such tests.",
author = "Reid, {John D.} and Hascall, {Jason A.} and Sicking, {Dean L.} and Ron Faller",
year = "2009",
month = "12",
day = "1",
doi = "10.3141/2120-05",
language = "English (US)",
pages = "39--46",
journal = "Transportation Research Record",
issn = "0361-1981",
publisher = "US National Research Council",
number = "2120",

}

TY - JOUR

T1 - Inertial effects during impact testing

AU - Reid, John D.

AU - Hascall, Jason A.

AU - Sicking, Dean L.

AU - Faller, Ron

PY - 2009/12/1

Y1 - 2009/12/1

N2 - Shortcomings were identified in historic dynamic guardrail post testing methods that could overestimate the strength of guardrail posts by a factor of two. This inaccuracy resulted from the influence of inertia that was not previously accounted for during dynamic component testing. The effects of inertia were verified and quantified with several analysis methods including nonlinear finite element analysis, which was used to develop a computer simulation of the dynamic tests. Several alternative testing procedures that could significantly reduce the effects of inertia were identified and investigated. One of these testing alternatives-use of a crushable impact head-was shown with computer simulation to reduce the effects of inertia and maintain the benefits of strain rate effects. The use of such an impact head is recommended for all future dynamic post strength testing. The results of the study imply that changes should be made not only in the standard design procedures used for guardrail and other vehicular barriers, which are clearly influenced by inertial effects, but in all designs that are based on dynamic strength testing. Dynamic testing is very common in the field of transportation engineering and care should be taken to ensure that inertial effects are considered when performing such tests.

AB - Shortcomings were identified in historic dynamic guardrail post testing methods that could overestimate the strength of guardrail posts by a factor of two. This inaccuracy resulted from the influence of inertia that was not previously accounted for during dynamic component testing. The effects of inertia were verified and quantified with several analysis methods including nonlinear finite element analysis, which was used to develop a computer simulation of the dynamic tests. Several alternative testing procedures that could significantly reduce the effects of inertia were identified and investigated. One of these testing alternatives-use of a crushable impact head-was shown with computer simulation to reduce the effects of inertia and maintain the benefits of strain rate effects. The use of such an impact head is recommended for all future dynamic post strength testing. The results of the study imply that changes should be made not only in the standard design procedures used for guardrail and other vehicular barriers, which are clearly influenced by inertial effects, but in all designs that are based on dynamic strength testing. Dynamic testing is very common in the field of transportation engineering and care should be taken to ensure that inertial effects are considered when performing such tests.

UR - http://www.scopus.com/inward/record.url?scp=76149109474&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=76149109474&partnerID=8YFLogxK

U2 - 10.3141/2120-05

DO - 10.3141/2120-05

M3 - Article

AN - SCOPUS:76149109474

SP - 39

EP - 46

JO - Transportation Research Record

JF - Transportation Research Record

SN - 0361-1981

IS - 2120

ER -