EN 14425-3:2010
(Main)Advanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Part 3: Chevron notched beam (CNB) method
Advanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Part 3: Chevron notched beam (CNB) method
This European Standard provides a test method for fracture toughness determination based on the chevron-notch method. For the purposes of this European Standard, the term monolithic includes particle and whisker reinforced advanced technical ceramics which can be regarded as macroscopically homogeneous. It does not include long-fibre reinforced ceramics.
Hochleistungskeramik - Prüfverfahren zur Bestimmung der Bruchzähigkeit von monolithischer Keramik - Teil 3: Verfahren für Biegeproben mit Chevron-Kerb (CNB-Verfahren)
Diese Europäische Norm legt ein Prüfverfahren zur Bestimmung der Bruchzähigkeit nach dem Chevron Kerb Verfahren fest. Für die Anwendung dieser Europäischen Norm schließt der Begriff monolithisch partikel- und whiskerverstärkte Hochleistungskeramik ein, die als makroskopisch homogen angesehen werden kann. Das Verfahren gilt nicht für langfaserverstärkte Keramik.
Céramiques techniques avancées - Méthode d'essai de détermination de la ténacité à la rupture des céramiques monolithiques - Partie 3: Méthode de l'éprouvette à entaille en chevron
La présente Norme européenne propose une méthode d'essai visant à déterminer la ténacité à la rupture à l'aide de la méthode à entaille en chevron. Pour les besoins de la présente Norme européenne, le terme monolithique recouvre les céramiques techniques avancées renforcées de particules et de trichites pouvant être considérées comme macroscopiquement homogènes. Il n'inclut pas les céramiques renforcées de longues fibres.
Sodobna tehnična keramika - Preskusne metode za ugotavljanje odpornosti monolitske keramike proti lomljenju - 3. del: Upogibni preskus z zarezo (metoda CNB)
Ta evropski standard zagotavlja preskusno metodo za ugotavljanje odpornosti proti lomljenju na osnovi upogibne metode z zarezo. Za namene tega evropskega standarda izraz monolitski vključuje sodobno tehnično keramiko, ojačano z delci in filamenti, ki se lahko šteje za makroskopsko homogeno. Ne vključuje keramike, ojačane z dolgimi vlakni.
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.UQRVWL&1%Hochleistungskeramik - Prüfverfahren zur Bestimmung der Bruchzähigkeit von monolithischer Keramik - Teil 3: Verfahren für Biegeproben mit Chevron-Kerb (CNB-Verfahren)Céramiques techniques avancées - Méthode d'essai de détermination de la ténacité à la rupture des céramiques monolithiques - Partie 3: Méthode de l'éprouvette à entaille en chevronAdvanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Part 3: Chevron notched beam (CNB) method81.060.30Sodobna keramikaAdvanced ceramicsICS:Ta slovenski standard je istoveten z:EN 14425-3:2010SIST EN 14425-3:2010en,fr,de01-september-2010SIST EN 14425-3:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14425-3
June 2010 ICS 81.060.30 Supersedes CEN/TS 14425-3:2003English Version
Advanced technical ceramics - Test methods for determination of fracture toughness of monolithic ceramics - Part 3: Chevron notched beam (CNB) method
Céramiques techniques avancées - Méthode d'essai de détermination de la ténacité à la rupture des céramiques monolithiques - Partie 3: Méthode de l'éprouvette à entaille en chevron
Hochleistungskeramik - Prüfverfahren zur Bestimmung der Bruchzähigkeit von monolithischer Keramik - Teil 3: Verfahren für Biegeproben mit Chevron-Kerb (CNB-Verfahren) This European Standard was approved by CEN on 30 April 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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During the test, the crack front widens as the crack propagates from the tip, resulting in an increase in the force required to maintain growth. Countering this, the test piece becomes more compliant as the crack lengthens, and so the two effects result in a peak load being attained after some distance of propagation. The toughness is determined from the peak force applied. This test method employs the chevron notch in a flexural strength test piece, loaded in four-point bending geometry. The advantage is that it can be performed on standard flexural strength test pieces. SIST EN 14425-3:2010
5 Test apparatus 5.1 Flexural strength test apparatus of four-point bending type, in accordance with the requirements in EN 843-1. 5.2 Mechanical testing machine, capable of accurate recording of load/displacement data for loads in the range 0 N to 500 N. The load shall be calibrated in accordance with EN ISO 7500-1. NOTE A stiff loading system (i.e. frame, load cell and fixtures, etc.) is advantageous for this test. The compliance is ideally less than 5 × 10-5 m/N (see [1]). 5.3 Micrometer in accordance with ISO 3611 but measuring to an accuracy of 0,002 mm.
5.4 Calibrated device for measuring dimensions of the cut chevron after fracture, reading to an accuracy of 0,002 mm or better. NOTE This may be achieved by use of an appropriate travelling microscope, or a conventional microscope with a calibrated stage micrometer, or a microscope with a micrometer eyepiece. 5.5 Humidity measuring device for measuring relative humidity to an accuracy of ± 2 %, e.g. those according to ISO 4677. 6 Test pieces 6.1 Material selection Select the material or components from which test pieces are to be machined with reference to the considerations given in EN 1006. 6.2 Test piece dimensions 6.2.1 The test pieces shall preferably be of dimensions as for determination of flexural strength and described in EN 843-1. Alternatively, if availability of material permits, the dimensions may be scaled larger for convenience of machining of the notch. NOTE It is usually advantageous to test coarse-grained or heterogeneous materials in larger test piece sizes because it improves the chances of obtaining a valid test (see 7.9). 6.2.2 The standard size test pieces shall be (3,00 ± 0,15) mm × (4,00 ± 0,15) mm in cross-section, and have a minimum length of 45 mm. The surfaces shall be machined to a flatness of better than 0,01 mm over the test piece length, and opposite pairs of faces shall be parallel to better than 0,01 mm over the test piece length. The section should be visibly rectangular.
NOTE Chamfering in accordance with EN 843-1 is unnecessary for this test. SIST EN 14425-3:2010
6.3.3 A minimum of five test pieces shall be prepared. 7 Procedure 7.1 Measure the external dimensions of the test piece at the notch to the nearest 0,002 mm using the micrometer (5.3). 7.2 Measure the notch lengths a11 and a12 (to the points where the roots of the notch meet the external surfaces) to the nearest 0,002 mm using the calibrated device (5.4). The difference between the average value a
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