X-ray computed tomography (XCT) is an ideal tool for studying the morphology of materials in ambient conditions or under altered loading or temperature conditions. Using the traditional approach, these measurements are usually performed in a ‘step-and-shoot’ experiment, where different discrete steps are imaged and the external conditions for the sample are altered in between the image acquisition steps. While this provides valuable information, this experimental procedure has a few flaws. First, it cannot capture the relaxation of samples when they adapt to the new external conditions. This will cause movement during a scan and hence forces the user to pause in between the different load steps. The imaged state of the sample is then bound to be different from the intended state due to the sample relaxation. Also, step-and-shoot imaging will inevitably cause a loss of information. If a sample breaks or deforms during a certain load step, the exact point of failure will not be imaged, making it more difficult to understand what has exactly happened and over which time scale the process took place.
In this work, we demonstrate a continuous acquisition setup for dynamic loading experiments of composites. By matching the scan speed to the speed of compression and using a continuous, infinite sample rotation, the entire experiment is captured. A novel reconstruction approach enables us to optimise the imaged time window, signal to noise ratio and the temporal resolution of the experiment.
Bio available soon