EP2100124A1 - Procédé de contrôle par impulsion à haute pression d'éléments mécaniques - Google Patents

Procédé de contrôle par impulsion à haute pression d'éléments mécaniques

Info

Publication number
EP2100124A1
EP2100124A1 EP08701049A EP08701049A EP2100124A1 EP 2100124 A1 EP2100124 A1 EP 2100124A1 EP 08701049 A EP08701049 A EP 08701049A EP 08701049 A EP08701049 A EP 08701049A EP 2100124 A1 EP2100124 A1 EP 2100124A1
Authority
EP
European Patent Office
Prior art keywords
ionic liquid
test
pressure
testing
components
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP08701049A
Other languages
German (de)
English (en)
Inventor
Eberhard Schlücker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Friedrich Alexander Universitaet Erlangen Nuernberg
Original Assignee
Friedrich Alexander Universitaet Erlangen Nuernberg
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 Friedrich Alexander Universitaet Erlangen Nuernberg filed Critical Friedrich Alexander Universitaet Erlangen Nuernberg
Publication of EP2100124A1 publication Critical patent/EP2100124A1/fr
Withdrawn legal-status Critical Current

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
    • G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
    • 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
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0005—Repeated or cyclic
    • 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
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means

Definitions

  • the invention relates to a method for high-pressure pulsation testing of mechanical components, in which the components are tested under pulsating high pressure for fatigue using a pressure fluid as a test medium, according to the preamble of claim 1.
  • the most commonly used technique is the hydraulic testing principle.
  • a rotating positive displacement pump usually a gear pump
  • oil circulates under pressure and fed via controlled valves, depending on the desired test frequency, a pressure booster unit. Due to the circulation as well as the amount of oil involved in the compression, the efficiency of the testing machine is only between 30 and 40%.
  • the achievable test frequencies are in the range up to about 15 Hz.
  • the advantage of this technique is the wide frequency range and the Adjustability of load characteristics, such as sinusoidal shape, almost rectangular shape, Einzelhubabruf etc., as well as the possibility of load-oriented or wegorient convinced driving style.
  • the disadvantage here, as already mentioned, the low efficiency of the testing machine.
  • resonators are known as testing machines, in which the pulsation stroke is generated by spring-mass systems excited by unbalance motors. This technique has only recently been transferred to high pressure pulsation testing. The stroke and the force are hereby adjustable in a certain way. In addition, the efficiency is similar to that of the mechanically acting pulsators.
  • test pressures reach values of up to 4,000 bar, and it is also desirable or intended to use test pressures of up to 6,000 bar. At such test pressures, the compressibility of the test medium is of great importance, since this determines the required displacement volume of the pulsator. However, since the oil used as the test medium still has a not insignificant compressibility, the performance of the respective pulsators is not yet completely satisfactory.
  • the invention is therefore based on the object to avoid these disadvantages to provide an improved method for Hochdruckpulsations phenomenon of mechanical components.
  • the object is solved by the invention with the features of claim 1.
  • Advantageous embodiments thereof are described in the further claims.
  • the ionic liquid in a further development of the invention is used as an ionic liquid such that has a low compressibility.
  • the ionic liquid may also be added to a chemical additive to reduce its compressibility.
  • the ionic liquid used is one which has a high temperature resistance. This may be, for example, a temperature resistance of at least 300 ° C.
  • an organic ionic liquid and / or an inorganic ionic liquid or a mixture of these two liquids is used as the ionic liquid.
  • the displacement volume of the testing machines is also great correspondingly lower. It can thus be tested with an existing machine either more components at the same time parallel or larger individual components.
  • the lower compressibility of the ionic liquids used allows thus to extend the test with existing testing machines to larger components. Therefore, if not only a single component, but simultaneously two or more components are tested with a single testing machine, this means a reduced inspection effort, which represents a convincing economic advantage.
  • the ionic liquid used is one which has a high temperature resistance. This is a typical mixture of lithium nitrate, potassium nitrate, Nitrite and residues of other ingredients. It can even be achieved with yet to be created ionic liquids of other types higher temperatures.
  • Another advantage of the group of ionic liquids is their chemical inertness, so that hardly any attacks on materials are to be feared.
  • ionic liquids IL
  • ionic liquids IL
  • ionic liquids are liquids which contain only ions. They are therefore liquid salts whose melting points are below, for example, 100.degree.
  • ionic liquids should be understood as meaning substances which consist of cations and anions. In this case, mixtures of several cations and anions are possible.
  • the pressure build-up in a pulsator is approximately as follows: a) A loading system sets the piston working space under a boost pressure, which represents a lower pressure value. This piston working space is completely filled and has no gas bubbles. b) The mechanical components used as test specimens are connected to the piston working space. These are also completely filled and gas-free. c) The volume of the test specimen, the piston working space and possibly installed pipelines forms the compression volume V. d) The piston of the pulsator compresses this compression volume V until - set by the stroke volume (stroke x piston cross section) - the desired maximum test pressure is reached. Then the piston goes into his
  • test specimen must withstand a certain pressure amplitude at least 5 million load cycles Some test rules require 10 million load changes. This corresponds to a test run time of 11, 5 days or 24 hours at a test frequency of 10 Hz
  • the ionic liquids used according to the invention can also have a high temperature resistance, it is also possible to carry out the high pressure pulsation test at higher temperatures

Landscapes

  • 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

L'invention concerne un procédé de contrôle par impulsions à haute pression d'éléments mécaniques, dans lequel les pièces sont soumises à un test de fatigue en utilisant un fluide hydraulique comme milieu de contrôle sous haute pression pulsée, réalisé de telle sorte que l'on utilise un liquide ionique comme milieu de contrôle dans le contrôle par impulsion à haute pression.
EP08701049A 2007-01-12 2008-01-09 Procédé de contrôle par impulsion à haute pression d'éléments mécaniques Withdrawn EP2100124A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007001822 2007-01-12
PCT/EP2008/000118 WO2008083961A1 (fr) 2007-01-12 2008-01-09 Procédé de contrôle par impulsion à haute pression d'éléments mécaniques

Publications (1)

Publication Number Publication Date
EP2100124A1 true EP2100124A1 (fr) 2009-09-16

Family

ID=39185713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08701049A Withdrawn EP2100124A1 (fr) 2007-01-12 2008-01-09 Procédé de contrôle par impulsion à haute pression d'éléments mécaniques

Country Status (2)

Country Link
EP (1) EP2100124A1 (fr)
WO (1) WO2008083961A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014106929B4 (de) 2014-05-16 2022-12-15 Wegard Gmbh Aktorelement
DE102014008321B3 (de) 2014-05-30 2015-09-17 Lewa Gmbh Pulsator
CN114720114B (zh) * 2022-06-10 2022-08-12 沈阳美茵联合检测有限公司 航空液压导管试验样件及其正弦波脉冲疲劳试验方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725742A (en) * 1951-12-15 1955-12-06 Cooper Bessemer Corp Apparatus for fatigue testing of hollow bodies
DE102005007100A1 (de) * 2005-02-16 2006-08-17 Solvent Innovation Gmbh Prozess- bzw. Arbeitsmaschine mit ionischer Flüssigkeit als Betriebsflüssigkeit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008083961A1 *

Also Published As

Publication number Publication date
WO2008083961A1 (fr) 2008-07-17

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