AI Article Synopsis
- A specialized infrared high-speed camera has been developed to study the temperature changes within growing shear bands in metals at a microscale level.
- It was discovered that the microstructure of these shear bands is irregular and includes short-range periodic patterns of intense "hot spots" during shear band growth, which contrasts with traditional views of uniform temperature and deformation in these regions.
- Similar nonuniform structures in shear bands have been observed in natural settings, such as the Earth's lower crust and upper mantle, indicating a connection between these findings and geological processes.
Article Abstract
By using a unique infrared high-speed camera especially constructed for recording highly transient temperature fields at the microscale, we are able to reveal the spatial and temporal microstructure within dynamically growing shear bands in metals. It is found that this structure is highly nonuniform and possesses a transient, short range periodicity in the direction of shear band growth in the form of an array of intense "hot spots" reminiscent of the well-known, shear-induced hydrodynamic instabilities in fluids. This is contrary to the prevailing classical view that describes the deformations and the temperatures within shear bands as being essentially one-dimensional fields. These observations are also reminiscent of the nonuniform structure of localized shear regions believed to exist, at an entirely different length scale, in the earth's lower crust and upper mantle.
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| http://dx.doi.org/10.1103/PhysRevE.64.036128 | DOI Listing |
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