Download An Introduction to the Mechanical Properties of Ceramics by David J. Green PDF

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By David J. Green

Over the last twenty-five years ceramics became key fabrics within the improvement of many new applied sciences as scientists were capable of layout those fabrics with new constructions and homes. An figuring out of the criteria that effect their mechanical habit and reliability is key. This publication will introduce the reader to present techniques within the box. It comprises difficulties and workouts to aid readers advance their talents. this can be a finished creation to the mechanical houses of ceramics, and is designed basically as a textbook for complex undergraduates in fabrics technology and engineering. it's going to even be of price as a supplementary textual content for extra normal classes and to business scientists and engineers all for the improvement of ceramic-based items, fabrics choice and mechanical layout.

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Extra info for An Introduction to the Mechanical Properties of Ceramics (Cambridge Solid State Science Series)

Example text

15) dx From these definitions, e.. represents normal strains when i=j and pure shear strains when /#/. p so that only six of the components are independent and the array of components is said to be symmetric. , there are only three independent components (one for each axis). For the case in which the off-diagonal components are the negative of each other, the set of components is termed antisymmetric. In some cases, there are only normal strains at a point. These are termed principal strains and the axes that describe these principal values are called the principal axes.

There is, however, an unusual effect in ceramic materials in that the onset of microcracking depends on the grain (crystal) size. If the grain size is below a critical value, no spontaneous microcracking occurs. Thus, microcrack-free ceramics can be fabricated from materials with large thermal expansion anisotropy, provided the grain size is kept below the critical grain size for microcracking. 2. 7). Although not discussed here, it is also important to note that thermal expansion coefficients often vary with temperature in many ceramic systems.

U= 7^/2/JL and U=P2/2B for simple shear and hydrostatic compression, respectively. The principle of superposition can also be applied to these elastic strain energy densities. 1 gives values of the four engineering elastic constants for various ceramic materials. Various trends can be observed in this table and these will be discussed in the next chapter. 4 Strain at a point The definitions of stress and strain developed earlier were for uniform stress states but, often, one has to deal with situations in which the stress and strain are non-uniform and vary from point to point in a body.

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