標準號：BS EN 820-5-2009
中文標準名稱：**工業陶瓷.單片陶瓷的熱機械性能.第5部分:高溫下彈性模量的測定
英文標準名稱：Advanced technical ceramics - Thermomechanical properties of monolithic ceramics - Part 5:Determination of elastic moduli at elevated temperatures
標準類型：Q32
發布日期：2009/7/31 12:00:00
實施日期：2009/7/31 12:00:00
中國標準分類號：Q32
國際標準分類號：81.060.30
引用標準：EN 820-1;EN 843-1-2006;EN 60584-2;EN ISO 7500-1;EN ISO/IEC 17025;ISO 463;ISO 3611;ISO 6906
適用范圍：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-pointbending.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 levated 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.