Cracking up


By Justin Mullins PREDICTING how cracks will form in critical welds on aircraft or spacecraft is difficult, and making detailed images of the stresses that cause them is even tougher. But help will soon be at hand with a new lens that focuses neutrons more sharply than ever before. To picture the structure of a metal, including any stresses it contains, researchers look at the scattering pattern made by bombarding the material with neutrons. This pattern depends on the gaps between atoms,
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