High-speed Stochastic Fatigue Testing

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Good stochastic fatigue tests are difficult to perform. One of the major reasons is that ordinary servohydraulic loading systems realize the prescribed load history accurately at very low testing speeds only. If the speeds used for constant amplitude testing are applied to stochastic fatigue testing, quite unacceptable errors are introduced. Usually this problem is solved by running the tests at very low speeds and by editing the load history in order to reduce the duration of the test. In this paper a new method for control of stochastic fatigue tests is proposed. It is based on letting the analog control device remain as the basic control mechanism in the system, but distorting the input signal by computer in order to minimize the errors of the load history extremes. The principle proves to be very efficient to reduce all kinds of system errors and has shown to be able to increase the allowable speed by a factor from 10 to 30.
Original languageEnglish
JournalExperimental Mechanics
Volume30
Issue number1
Pages (from-to)4-9
Number of pages6
ISSN0014-4851
DOIs
Publication statusPublished - 1990

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Fatigue testing
Fatigue of materials
Testing

Keywords

  • Stochastic Differential Equations
  • Stochastic Fatigue Load Generation
  • Stochastic Loads
  • Fatigue

Cite this

@article{fefe41d06b6f11dca380000ea68e967b,
title = "High-speed Stochastic Fatigue Testing",
abstract = "Good stochastic fatigue tests are difficult to perform. One of the major reasons is that ordinary servohydraulic loading systems realize the prescribed load history accurately at very low testing speeds only. If the speeds used for constant amplitude testing are applied to stochastic fatigue testing, quite unacceptable errors are introduced. Usually this problem is solved by running the tests at very low speeds and by editing the load history in order to reduce the duration of the test. In this paper a new method for control of stochastic fatigue tests is proposed. It is based on letting the analog control device remain as the basic control mechanism in the system, but distorting the input signal by computer in order to minimize the errors of the load history extremes. The principle proves to be very efficient to reduce all kinds of system errors and has shown to be able to increase the allowable speed by a factor from 10 to 30.",
keywords = "Stochastic Fatigue Load Generation, Stochastic Loads, Fatigue, Stochastic Differential Equations, Stochastic Fatigue Load Generation, Stochastic Loads, Fatigue",
author = "Rune Brincker and S{\o}rensen, {John Dalsgaard}",
year = "1990",
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}

High-speed Stochastic Fatigue Testing. / Brincker, Rune; Sørensen, John Dalsgaard.

In: Experimental Mechanics, Vol. 30, No. 1, 1990, p. 4-9.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - High-speed Stochastic Fatigue Testing

AU - Brincker, Rune

AU - Sørensen, John Dalsgaard

PY - 1990

Y1 - 1990

N2 - Good stochastic fatigue tests are difficult to perform. One of the major reasons is that ordinary servohydraulic loading systems realize the prescribed load history accurately at very low testing speeds only. If the speeds used for constant amplitude testing are applied to stochastic fatigue testing, quite unacceptable errors are introduced. Usually this problem is solved by running the tests at very low speeds and by editing the load history in order to reduce the duration of the test. In this paper a new method for control of stochastic fatigue tests is proposed. It is based on letting the analog control device remain as the basic control mechanism in the system, but distorting the input signal by computer in order to minimize the errors of the load history extremes. The principle proves to be very efficient to reduce all kinds of system errors and has shown to be able to increase the allowable speed by a factor from 10 to 30.

AB - Good stochastic fatigue tests are difficult to perform. One of the major reasons is that ordinary servohydraulic loading systems realize the prescribed load history accurately at very low testing speeds only. If the speeds used for constant amplitude testing are applied to stochastic fatigue testing, quite unacceptable errors are introduced. Usually this problem is solved by running the tests at very low speeds and by editing the load history in order to reduce the duration of the test. In this paper a new method for control of stochastic fatigue tests is proposed. It is based on letting the analog control device remain as the basic control mechanism in the system, but distorting the input signal by computer in order to minimize the errors of the load history extremes. The principle proves to be very efficient to reduce all kinds of system errors and has shown to be able to increase the allowable speed by a factor from 10 to 30.

KW - Stochastic Fatigue Load Generation

KW - Stochastic Loads

KW - Fatigue

KW - Stochastic Differential Equations

KW - Stochastic Fatigue Load Generation

KW - Stochastic Loads

KW - Fatigue

U2 - 10.1007/BF02322694

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