SIST EN 843-2:2007

Oznaka standarda: SIST EN 843-2:2007
Koda projekta: 00184166
Organizacija: SIST
Naslov (angleški): Advanced technical ceramics - Mechanical properties of monolithic ceramics at room temperature - Part 2: Determination of Young's modulus, shear modulus and Poisson's ratio
Naslov (slovenski): Sodobna tehnična keramika - Monolitna keramika - Mehanske lastnosti pri sobni temperaturi – 2. del: Določevanje elastičnega modula (Youngov modul), strižnega modula in Poissonovega števila
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Tehnični odbor: I13 - Imaginarni 13
ICS: 81.060.30
Status: Objavljen
Objavljen: 01-maj-2007
Refer. št. objave: Sporocila 2007-05
Referenčna oznaka: EN 843-2:2006
Področje projekta (angleško): This part of EN 843 specifies methods for determining the elastic moduli, specifically Young’s modulus, shear modulus and Poisson’s ratio, of advanced monolithic technical ceramics at room temperature. This European Standard prescribes four 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 flexure. 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, shear modulus and Poisson’s ratio from the time-of-flight of an ultrasonic pulse. D The determination of Young’s modulus from the fundamental natural frequency of a struck bar (impulse excitation method). All the test methods assume the use of homogeneous test pieces of linear elastic materials. NOTE 1 Not all ceramic materials are equally and linearly elastic in tension and compression, such as some porous materials and some piezoelectric materials. With the exception of Method C, the test assumes that the test piece has isotropic elastic properties. Method C may be used to determine the degree of anisotropy by testing in different orientations. NOTE 2 An ultrasonic method for dealing with anisotropic materials (ceramic matrix composites) can be found in ENV 14186 (see Bibliography). An alternative to Method D for isotropic materials using disc test pieces is given in Annex A. NOTE 3 At high porosity levels all of the methods except Method C can become inappropriate. The methods are only suitable for a maximum grain size (see EN 623-3), excluding deliberately added whiskers, of less than 10 % of the minimum dimension of the test piece. NOTE 4 The different methods given in this European Standard can produce slightly different results on the same material owing to differences between quasi-isothermal quasi-static an
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Nadomešča SIST ENV 843-2:2000 - Advanced technical ceramics - Monolithic ceramics - Mechanical properties at room temperature - Part 2: Determination of elastic moduli 01-maj-2007


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