3-D High-Density Strain Mapping Procedure Based on High-Resolution CT
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abstract
A tracking procedure for the high-resolution X-ray computed tomography (CT) has been
developed in order to measure 3-D local strain within a deforming material in high-density. A
dispersion-strengthened copper alloy model sample with alumina particles, which contains micropores,
was visualized by the synchrotron radiation CT. The pores observed in reconstructed CT
volumes were used as tracking markers. The developed tracking method using a set of matching
parameters, which classifies matched, pended and rejected markers, exhibited high ratio of success
tracking. Furthermore, the ratio was improved by applying the spring model method, which is one
of the particle image velocity (PIV) methods utilized in the field of the fluid mechanics, to the
pended markers. The method based on the image analysis of CT imaging volumes provides us 3-D
high-density strain mapping.
