What is BS EN 843-2 – Young’s modulus of monolithic ceramics about?
BS EN 843 is a European standard series that discusses advanced technical ceramics.
BS EN 843-2 is the second part of the series that specifies Young’s modulus, shear modulus and Poisson’s ratio, of advanced monolithic technical ceramics at room temperature.
BS EN 843-2 provides four alternative methods for determining some or all of these three parameters:
- The determination of Young’s modulus by static flexure of a thin beam in three- or four-point flexure
- 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
- The determination of Young’s modulus, shear modulus and Poisson’s ratio from the time-of-flight of an ultrasonic pulse
- The determination of Young’s modulus from the fundamental natural frequency of a struck bar (impulse excitation method)
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.
An alternative to Method D for isotropic materials using disc test pieces is given in Annex A.
Note 1: At high porosity levels all of the methods except Method C may become inappropriate. The methods are only suitable for maximum grain size, excluding deliberately added whiskers, of less than 10 % of the minimum dimension of the test piece.
Note 2: 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 and quasi-adiabatic dynamic conditions. In addition, the calculation routines for different methods have different origins and different potential uncertainties which have not been rigorously evaluated in producing this European Standard. Some information is given in Annex B.
Note 3: All the test methods assume the use of homogeneous test pieces of linear elastic materials.
Who is BS EN 843-2 - Young’s modulus of monolithic ceramics for?
BS EN 843-2 on Young’s modulus of monolithic ceramics is useful for:
- Manufacturers of advanced technical ceramics
- The ceramic manufacturing industry
- Mechanical and chemical engineers
- Quality control and testing authorities
- Product development teams / Technical experts
- Industries including but not limited to aerospace and defence, healthcare, automotive, telecommunications, etc
- Regulatory bodies
Why should you use BS EN 843-2 - Young’s modulus of monolithic ceramics?
Determining monolithic ceramics' mechanical properties, such as stress resistance and strength, is essential in determining whether they can play a positive role in the performance of the end-application.
BS EN 843-2 provides best industry guidance on the test methods for determining Young's modulus, shear modulus and Poisson's ratio. The results of these tests can demonstrate the extent to which your products can withstand stress and strain without causing failures.
Young’s modulus determines how easily the material can stretch and deform, shear modulus provides indications on the rigidity of the material, while the Poisson’s ratio is a measure of how much a material deforms under stress. All these assessments can be extremely beneficial when it comes to selecting the right materials to suit the desired engineering application needs.
If you are a manufacturer of monolothic ceramic materials, BS EN 843-2 can pose as an important quality control measure.
Thus, BS EN 843-2 is your guide on determining whether the monolithic ceramics are fit for purpose.
