Meaning
Non-destructive three-dimensional imaging utilizes X-rays to generate high-resolution cross-sectional representations of the internal structure of polymeric parts. By deploying micro-computed tomography, engineers can inspect the orientation of reinforcement fibres and locate microvoids without damaging the sample. This analysis is indispensable for confirming the quality of injection moulded components used in aerospace or medical applications.
Imaging Mechanism
The specimen rotates slowly in the path of a focused X-ray beam while a sensor records thousands of individual projection images. In micro-computed tomography, computer algorithms compile these diverse projection angles into a comprehensive volumetric dataset. This process yields a precise spatial map of the relative density variations across the entire specimen.
Defect Detection
Density contrasts differentiate polymer matrix regions from inclusions and glass fibres. Because micro-computed tomography resolves details down to the micrometre scale, it exposes tiny shrinkage cavities that occur during the cooling phase. These internal faults act as stress concentrators and can lead to unexpected mechanical failure under fatigue conditions.
Industrial Application
Injection moulders employ these volumetric scans to optimize gate locations and cycle times during tool qualification trials. Analyzing the fibre orientation distribution through micro-computed tomography reveals whether the chosen melt flow paths align the fibres along the direction of expected working loads. If the scan shows random or transverse alignment in highly stressed regions, the tooling must be modified to alter the flow front and prevent premature crack propagation.
This spatial confirmation allows the production team to adjust mould parameters with high precision, saving time compared to trial-and-error changes on the factory floor.
