This Chapter is an introduction to the various length scales of internal stresses, the causes of internal stresses and in particular their measurement by neutron diffraction. Some of the approaches used to model and interpret internal stresses are also introduced, and the use of these approaches to interpret deformation mechanisms illustrated through a number of examples.

In nearly every case when an engineering material is employed it will experience some stresses, if only those due to its own weight. Real materials are not the uniform continuum they are sometimes considered to be, and local differences in structure or properties mean...

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