Low-density materials, from laminate layers in airplane wings to foams and epoxies that cushion parts, have been the focus of new study. In studying these materials, scientists borrowed and refined a technique being studied by the medical field, X-ray phase contrast imaging, to look inside the softer side of things without taking them apart.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2017/07/170717120044.htm
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