WO2006116782A1 - Procede pour mener des essais de fatigue sur un corps d'essai et dispositif d'essai - Google Patents

Procede pour mener des essais de fatigue sur un corps d'essai et dispositif d'essai Download PDF

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Publication number
WO2006116782A1
WO2006116782A1 PCT/AT2006/000173 AT2006000173W WO2006116782A1 WO 2006116782 A1 WO2006116782 A1 WO 2006116782A1 AT 2006000173 W AT2006000173 W AT 2006000173W WO 2006116782 A1 WO2006116782 A1 WO 2006116782A1
Authority
WO
WIPO (PCT)
Prior art keywords
test
test body
vibration exciter
spring
frame
Prior art date
Application number
PCT/AT2006/000173
Other languages
German (de)
English (en)
Inventor
Johann Kollegger
Bernd KÖBERL
Herbert Pardatscher
Markus Vill
Original Assignee
Technische Universität Wien
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technische Universität Wien filed Critical Technische Universität Wien
Priority to EP06721230A priority Critical patent/EP1877749A1/fr
Publication of WO2006116782A1 publication Critical patent/WO2006116782A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0017—Tensile
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0035—Spring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073—Fatigue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/0202—Control of the test
    • G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0278—Thin specimens
    • G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables

Definitions

  • the invention relates to a method for carrying out fatigue experiments on a test specimen and a device for carrying out the method.
  • Structures whose fatigue behavior is to be taken into account in dimensioning are either dimensioned according to standards or sufficient resistance to fatigue failure by means of fatigue tests can be demonstrated.
  • Fatigue tests are used, for example, for assessing the fatigue behavior of angled cables and cable-stayed anchors for cable-stayed or cable-stayed bridges, as well as for coupling tensioning cables in prestressed reinforced concrete structures.
  • the fatigue behavior is influenced by the following factors:
  • Fatigue tests on small components can be performed with servo-hydraulic testers or Hydropx ⁇ sanlagen with high frequencies (20 to 100 Hertz).
  • large components such as Slanted cable anchors, which require a basic force of approx. 2500 kN, reduce the test frequency of servo-hydraulic test systems to approx. 1 hertz.
  • Hydropulse systems are only offered by test equipment manufacturers in the force range up to a maximum of 2500 kN. At present, there are three large plants in Europe where fatigue tests are carried out for large components, e.g. Slanted cable, can be performed.
  • a second test facility is located at the Eidjaen Materialprüfweg in D Weg, Switzerland.
  • the basic force is applied with hydraulic presses.
  • the oscillating load is applied by the servo-hydraulically controlled extension and retraction of hydraulic presses.
  • the achievable test frequency is therefore in the order of 1 Hertz.
  • the third test device is located at the Laboratoire central de ponts et clices, France.
  • the basic force is applied to the test specimen (length approx. 5.20 m) by means of three hydraulic presses and to a temporary cable (length 13.80 m).
  • the swinging load is generated by small dynamic presses.
  • slightly higher test frequencies than at the test facility of the Technical University of Kunststoff and the EMPA are possible.
  • the invention has for its object to provide a method and a test device that allow fatigue experiments with much higher frequencies and with a lower energy input than in the known designs.
  • This object is procedurally achieved in that the specimen is exposed in a spring stiffness system having a static stress and is additionally exposed by means of a vibration exciter vibrational stress, wherein in the system for the static stress, a closed power flow is generated.
  • the spring stiffness of the oscillating mass system is adjusted to obtain the first natural frequency that constitutes the test frequency, either adjusting the spring stiffness and / or increasing or decreasing the vibrating masses, and performing the fatigue test at that first natural frequency.
  • a test frequency of the fatigue test is set between 5 and 100 Hz, in particular between 25 and 50 Hz.
  • test specimen is fastened in a test rig having a high rigidity, the force flow being closed via the test frame, the test specimen and via a resilient connection.
  • the rigidity of the test frame is expedient at least 5 times, preferably at least 10 times, higher than the rigidity of the test specimen.
  • the vibrations are caused mechanically or electromechanically.
  • a suitable variant is characterized in that the vibration is damped.
  • a test device for carrying out the method according to the invention is characterized by the combination of the following features: a test frame with at least one support for coupling a
  • Test specimen one acting between the specimen and the test frame
  • the spring device is mechanically coupled on the one hand via the loading device with the test frame and on the other hand with the test specimen, wherein the vibration exciter is preferably provided at the coupling point between the spring means and the test specimen.
  • the vibration generator is designed as a mechanical vibration exciter and provided on a arranged between the spring means and the test body holding means, such as a housing, wherein preferably on the holding means balancing masses are attached
  • the vibration exciter is suitably guided in the direction of vibration by means of a guide device, preferably formed by a suspension device or a linear guide, such as a slide bearing.
  • test piece is coupled with one end portion on the test frame and the other end via the loading device to the test frame, and that the vibration generator is coupled via the spring means to the test frame and on the Test body acts between its end regions, wherein the vibration exciter is preferably designed as a mechanical vibration exciter.
  • a test device for bending fatigue tests is characterized in that the test body is coupled with its end portions with the test frame and claimed between its end via at least one spring means which is attached on the one hand to the test frame and on the other hand via the loading device with the test body, subjected to bending is, where appropriate, the vibration exciter is coupled to the test specimen optionally with the interposition of balancing weights
  • Fig. 1 a fiction, contemporary test apparatus for fatigue experiments in a standing arrangement for testing an anchorage of an inclined cable (The vibration stress is applied by means of a mechanical unbalance exciter).
  • Fig. 2 is a section along the line II-II of Fig. 1st
  • Fig. 3 shows a second embodiment of the test device in a vertical arrangement for testing a tendon coupling (The vibration stress is applied with two electromechanical vibration exciters).
  • FIG. 4 shows a section along the line IV-IV of FIG. 3 and FIG. 5.
  • FIG. 5 shows a section along the line V-V of FIG. 3 and FIG. 4.
  • FIG. 6 shows a plan view of a third embodiment of the test device in a horizontal arrangement for testing a tendon coupling (the vibration stress is applied by means of a mechanical unbalance exciter.)
  • the structure for receiving the unbalance exciter, the additional masses and the two anchors is suspended upwards with steel cables.
  • FIG 8 shows the layout of a fourth embodiment of the test apparatus in a horizontal arrangement for testing an anchoring cable (The vibration stress is applied by means of a mechanical unbalance exciter.)
  • the steel structure for receiving the unbalance exciter, the additional masses and the two anchors is mounted on a plain bearing).
  • FIG. 9 is a section along the line IX-IX of FIG. 8th 10 shows a fifth embodiment of the test device for testing a saddle of a
  • Angled cable (A saddle is used to deflect an inclined cable in the pylon of a
  • Fig. 1 1 is a section along the line XI-XI in Fig. 10.
  • Fig. 12 shows a sixth embodiment of the test apparatus for testing a beam
  • a test arrangement 6 is provided centrally and parallel to the longitudinal columns 2, formed by a test piece 7 fixed to the lower crosshead 4, a holding device 8 coupled to the test piece 7 for a vibration exciter 9 and one with the holding device 8 coupled spring device 10, designed as a pull rope.
  • the upper end of the traction cable 10 is coupled to the upper crosshead 3 via a hydraulic cylinder 11, such as a hydraulic press.
  • a damping element 22 is provided between the crosshead 3 and the hydraulic cylinder 11, a damping element 22 is provided.
  • the vibration exciter 9 is a mechanical unbalance exciter, as it e.g. from "Building Dynamics Practical” by Rainer Flesch, Bauverlag GmbH, Wiesbaden and Berlin, is known, trained.
  • test piece 7 is a piece of a cable, which is provided at its ends with anchors 13, which are also or actually subjected to the test.
  • the rigidity of the test frame 1 is at least 5, preferably 10 times greater than that of the test arrangement 6.
  • the test frame 1 forms with the test assembly 6, ie the test body 7, the vibration exciter 9 with the holding device 8 and acting as a spring device traction cable 10, a system , which has a certain spring stiffness, wherein the power flow is closed in the system.
  • the dynamic system is in the resonance state (ie in the first natural frequency) during the experiment. This first natural frequency or the natural angular frequency depends essentially on the stiffness of the spring device 10, the test body 7, the holding device 8 and the test frame 1 and on the mass density of the system.
  • the first natural frequency of the system can be adjusted over the length and thickness of the traction cable 10 and the mass of the vibrator 9 and the additional masses 12 at the coupling point between the test piece 7 and 10 traction cable.
  • the excitation force of the mechanical unbalance exciter depends on the rotating masses and the set speed. This excitation force is multiplied by the resonant dynamic magnification factor (e.g., 50% attenuation equal to 1%).
  • the main advantages of this test device are the very high test speed and the low energy consumption during the tests compared to conventional systems.
  • the energy costs for the operation and possible cooling of the vibrator 9 amount to only a fraction of the cost of operating and cooling a hydraulic unit.
  • the duration of the test is reduced for 2 million load changes at a frequency of 40 hertz to 13.9 hours compared to 23 days at a frequency of 1 hertz.
  • a vibration exciter 9 operating on an electromechanical basis is provided, which is supported on the foundation block 5 for the test frame 1 and coupled via a cross member 14 to the traction cable 10 and the test body 7.
  • the test specimen is formed by two tendon pieces, which are connected to a coupling 15.
  • Vibration exciters 9 on mechanical (counter-rotating masses) and electromechanical basis are available in the desired test range of 5 to 100 hertz and for the required forces on the market.
  • the arrangement of the test device can be both upright and lying and depends on the circumstances of the test hall. In a horizontal arrangement of the vibration exciter 9 must be stored accordingly, so that movement in Longitudinal direction of the test piece 7 is given. This can be realized by a corresponding rolling or sliding bearing, as shown in FIGS. 8 and 9, or a suspension 17 according to FIGS. 6 and 7.
  • the vibration generator 9 is attached to the saddle 18 and the spring device 10 - also a pull rope 10 - is in the direction of vibration, starting from the coupling with the saddle 18 to the test frame 1 directed and coupled with this also.
  • the tensile force is applied here with a hydraulic press 11 on the both sides with the test frame 1 coupled cable 19.
  • FIGS. 12 and 13 illustrate a test frame 1 for carrying out a fatigue test on a load-bearing beam 20, such as a reinforced concrete beam.
  • the force causing the bending is applied by hydraulic presses 11 3 which are mounted transversely to the carrier 20 cross members 21, applied, between the hydraulic presses and the test frame 1 spring elements 10, for example, tie rods, are provided, over which the power flow is closed.
  • a damping element 22 is provided in the direction of action of the vibration generated by a mechanical vibration generator 9. Additional masses 12 are provided here between the vibration exciter 9 and the carrier 20.
  • spring elements 10 can - as described - traction cables or tension rods (made of steel or plastic, optionally fiber-reinforced) but also pressure rods are used.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

La présente invention concerne un procédé pour mener des essais de fatigue sur un corps d'essai (7). Afin de permettre une augmentation de la fréquence d'essai, notamment avec une sollicitation élevée sur le corps d'essai, le procédé est caractérisé en ce que le corps d'essai (7) est exposé à une sollicitation statique dans un système présentant une rigidité élastique et est également soumis à une sollicitation vibratoire au moyen d'un excitateur de vibration (9), un flux de forces fermé étant créé dans le système pour la sollicitation statique.
PCT/AT2006/000173 2005-05-02 2006-04-27 Procede pour mener des essais de fatigue sur un corps d'essai et dispositif d'essai WO2006116782A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06721230A EP1877749A1 (fr) 2005-05-02 2006-04-27 Procede pour mener des essais de fatigue sur un corps d'essai et dispositif d'essai

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA753/2005 2005-05-02
AT7532005A AT501168B1 (de) 2005-05-02 2005-05-02 Verfahren zur durchführung von dauerschwingversuchen an einem prüfkörper sowie prüfvorrichtung

Publications (1)

Publication Number Publication Date
WO2006116782A1 true WO2006116782A1 (fr) 2006-11-09

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PCT/AT2006/000173 WO2006116782A1 (fr) 2005-05-02 2006-04-27 Procede pour mener des essais de fatigue sur un corps d'essai et dispositif d'essai

Country Status (3)

Country Link
EP (1) EP1877749A1 (fr)
AT (1) AT501168B1 (fr)
WO (1) WO2006116782A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007908A1 (de) 2010-02-13 2011-08-18 Stetter, Ralf, Prof. Dr. Ing., 88213 Vorrichtung und Verfahren zur schwingungstechnischen Untersuchung von Polyurethanschäumen
CN104181059A (zh) * 2013-05-28 2014-12-03 深圳市海洋王照明工程有限公司 一种电缆疲劳测试装置
CN104483217A (zh) * 2014-12-31 2015-04-01 华侨大学 一种磨粒冲击疲劳测试设备
CN104535436A (zh) * 2014-12-31 2015-04-22 华侨大学 一种基于超声振动的微观尺度材料剪切疲劳测试设备
US9372137B1 (en) 2013-08-20 2016-06-21 Google Inc. Tension member fatigue tester using transverse resonance
CN113820230A (zh) * 2021-09-29 2021-12-21 中交公路长大桥建设国家工程研究中心有限公司 疲劳试验装置
CN117589595A (zh) * 2024-01-19 2024-02-23 资阳建工建筑有限公司 一种建筑工程钢筋强度检测仪

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106404555B (zh) * 2016-11-04 2023-08-11 中国建材检验认证集团江苏有限公司 钢筋反复弯曲试验机
CN111638139B (zh) * 2020-07-13 2023-07-11 盐城工学院 一种滑轮组混凝土抗拉强度及弹性模量试验装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664179A (en) * 1970-05-11 1972-05-23 Gilmore Ind Inc Apparatus and method for controlling a resonant testing machine
US4056974A (en) * 1975-05-23 1977-11-08 Carl Schenck Ag Method and hydraulic testing apparatus for performing resonance tests
GB2081457A (en) * 1980-08-05 1982-02-17 Instron Ltd A machine for testing materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3664179A (en) * 1970-05-11 1972-05-23 Gilmore Ind Inc Apparatus and method for controlling a resonant testing machine
US4056974A (en) * 1975-05-23 1977-11-08 Carl Schenck Ag Method and hydraulic testing apparatus for performing resonance tests
GB2081457A (en) * 1980-08-05 1982-02-17 Instron Ltd A machine for testing materials

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007908A1 (de) 2010-02-13 2011-08-18 Stetter, Ralf, Prof. Dr. Ing., 88213 Vorrichtung und Verfahren zur schwingungstechnischen Untersuchung von Polyurethanschäumen
CN104181059A (zh) * 2013-05-28 2014-12-03 深圳市海洋王照明工程有限公司 一种电缆疲劳测试装置
US9372137B1 (en) 2013-08-20 2016-06-21 Google Inc. Tension member fatigue tester using transverse resonance
US9557255B2 (en) 2013-08-20 2017-01-31 X Development Llc Tension member fatigue tester using transverse resonance
CN104483217A (zh) * 2014-12-31 2015-04-01 华侨大学 一种磨粒冲击疲劳测试设备
CN104535436A (zh) * 2014-12-31 2015-04-22 华侨大学 一种基于超声振动的微观尺度材料剪切疲劳测试设备
CN113820230A (zh) * 2021-09-29 2021-12-21 中交公路长大桥建设国家工程研究中心有限公司 疲劳试验装置
CN117589595A (zh) * 2024-01-19 2024-02-23 资阳建工建筑有限公司 一种建筑工程钢筋强度检测仪
CN117589595B (zh) * 2024-01-19 2024-03-19 资阳建工建筑有限公司 一种建筑工程钢筋强度检测仪

Also Published As

Publication number Publication date
AT501168A4 (de) 2006-07-15
EP1877749A1 (fr) 2008-01-16
AT501168B1 (de) 2006-07-15

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