BS EN 820-5:2009 - Advanced technical ceramics. Thermomechanical properties of monolithic ceramics. Determination of elastic moduli at elevated temperatures

BS EN 820-5:2009

Advanced technical ceramics. Thermomechanical properties of monolithic ceramics. Determination of elastic moduli at elevated temperatures

Status : Current, Under review   Published : July 2009

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This part of EN 820 describes methods for determining the elastic moduli, specifically Young's modulus, shear modulus and Poisson's ratio, of advanced monolithic technical ceramics at temperatures above room temperature. The standard prescribes three alternative methods for determining some or all of these three parameters: A the determination of Young's modulus by static flexure of a thin beam in three- or four-point bending. B the determination of Young's modulus by forced longitudinal resonance, or Young's modulus, shear modulus and Poisson's ratio by forced flexural and torsional resonance, of a thin beam. C the determination of Young's modulus from the fundamental natural frequency of a struck bar (impulse excitation method). This part of EN 820 extends the above-defined room-temperature methods described in EN 843-2 to elevated temperatures. All the test methods assume the use of homogeneous test pieces of linear elastic materials. The test assumes that the test piece has isotropic elastic properties. At high porosity levels all of the methods can become inappropriate. The maximum grain size (see EN 623-3), excluding deliberately added whiskers, should be less than 10 % of the minimum dimension of the test piece. NOTE 1 Method C in EN 843-2 based on ultrasonic time of flight measurement has not been incorporated into this part of EN 820. Although the method is feasible to apply, it is specialised, and outside the capabilities of most laboratories. There are also severe restrictions on test piece geometries and methods of achieving pulse transmission. For these reasons this method has not been included in EN 820-5. NOTE 2 The upper temperature limit for this test depends on the properties of the test pieces, and can be limited by softening within the timescale of the test. In addition, for method A there can be limits defined by the choice of test jig construction materials.




Standard NumberBS EN 820-5:2009
TitleAdvanced technical ceramics. Thermomechanical properties of monolithic ceramics. Determination of elastic moduli at elevated temperatures
StatusCurrent, Under review
Publication Date31 July 2009
Normative References(Required to achieve compliance to this standard)EN 820-1, ISO/IEC 17025:2005, IEC 60584-2:1982, ISO 3611, IEC 60584-2:1982/AMD 1:1989, EN ISO 7500-1, EN ISO/IEC 17025, EN 60584-2, ISO 6906, EN 843-1:2006
Informative References(Provided for Information)EN 60584-1, IEC 60584-1:1995, EN 843-2:2006
International RelationshipsEN 820-5:2009
Draft Superseded By08/30185915 DC
DescriptorsHigh-temperature testing, Mechanical properties of materials, Thermal properties of materials, Monolithic materials, Strain, Special ceramics, Ceramics, Thermal testing, High temperatures, Modulus of elasticity
ICS81.060.30
Title in FrenchCéramiques techniques avancées. Propriétés thermomécaniques des céramiques monolithiques. Détermination des modules élastiques à température élevées
Title in GermanHochleistungskeramik. Thermomechanische Eigenschaften monolithischer Keramik. Bestimmung der elastischen Moduln bei erhöhten Temperaturen
CommitteeRPI/13
ISBN978 0 580 63846 6
PublisherBSI
FormatA4
DeliveryYes
Pages28
File Size1.695 MB
Price£182.00


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