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| In [[physics]], '''strain scanning''' is the general name for various techniques that aim to measure the [[deformation (mechanics)|strain]] in a [[crystalline]] material through its effect on the [[diffraction]] of [[X-rays]] and [[neutrons]]. In these methods the material itself is used as a form of [[strain gauge]].
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| The various methods are derived from [[powder diffraction]] but look for the small shifts in the diffraction spectrum that indicate a change a lattice parameter instead of trying to derive unknown structural information. By comparing the lattice parameter to a known reference value it is possible to determine the. If sufficient measurements are made in different directions it is possible to derive the [[strain tensor]]. If the [[elasticity|elastic]] properties of the material are known, one can then compute the [[Cauchy stress tensor|stress tensor]].
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| ==Principles==
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| At its most basic level strain scanning uses shifts in [[Bragg's Law|Bragg diffraction]] peaks to determine the strain. Strain is defined as the change in length (shift in lattice parameter, d) divided by the original length (unstrained lattice parameter, d<sub>0</sub>). In diffraction based strain scanning this becomes the change in peak position divided by the original position. The precise equation is presented in terms of diffraction angle, energy, or - for relatively slow moving neutrons - time of flight:
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| :<math>\epsilon = \frac{\Delta d}{d_0} = \frac{\Delta \theta}{\theta_0} = \frac{\Delta E}{E_0} = \frac{\Delta t}{t_0} \, </math>
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| ==Methods==
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| The details of the technique are heavily influenced by the type of radiation used since lab X-rays, [[synchrotron]] X-rays and neutrons have very different properties. Nevertheless, there is considerable overlap between the various methods.
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| ==References==
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| {{reflist}}
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| {{unreferenced|date = December 2007}}
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| {{DEFAULTSORT:Strain Scanning}}
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| [[Category:Diffraction]]
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| [[Category:Deformation]]
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| {{physics-stub}}
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Latest revision as of 06:17, 6 January 2015
Hi there. My title is Sophia Meagher although it is not the name on my birth certification. Ohio is exactly where my house is but my husband wants us to move. Distributing manufacturing is exactly where my main income arrives from and it's some thing I really enjoy. Playing badminton is a thing that he is totally addicted to.
Feel free to surf to my page - clairvoyant psychic (Continued)