Advanced technical ceramics. Thermomechanical properties of monolithic ceramics - Determination of elastic moduli at elevated temperatures
Advanced technical ceramics. Thermomechanical properties of monolithic ceramics - Determination of elastic moduli at elevated temperatures
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What is BS EN 820-5 - Elastic moduli of monolithic ceramics about?
BS EN 820-5 focuses on advanced technical ceramics. BS EN 820-5 is the fifth part of the thermal features of the monolithic ceramics series that describes methods for determining the elastic moduli. BS EN 820-5 describes Young's modulus, shear modulus and Poisson's ratio, of advanced monolithic technical ceramics at temperatures above room temperature. 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 specialized, 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. Note 3: Methods B and C may not be appropriate for materials with significant levels of porosity which causes damping and an inability to detect resonances or natural frequencies, respectively. Note 4: This method does not provide for the effects of thermal expansion, i.e., the measurements are based on room temperature dimensions. Note 5: All the test methods assume ...
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