Abstract
The three dimensional growth of fatigue cracks in samples of nodular graphite cast iron is characterized using laboratory X-ray computed tomography. The cracks grow from laser machined artificial defects, their development is monitored in situ using laboratory X-ray computed tomography (lab. CT) and Digital Volume Correlation (DVC). The combination of both techniques gives access to the 3D displacement field at the tip of the crack (mainly mode I opening).
Highlights
I n their early stage of propagation, fatigue cracks have a strong three dimensional character
The cracks grow from laser machined artificial defects, their development is monitored in situ using laboratory X-ray computed tomography
Various 3D-imaging techniques have been used in previous studies to describe the 3D propagation of fatigue cracks. - SEM/FIB observations: this destructive approach can provide very high resolution images of a restricted area around the crack tip but in situ experiment are obviously impossible. - Laboratory X ray computed tomography
Summary
I n their early stage of propagation, fatigue cracks have a strong three dimensional character. The three dimensional growth of fatigue cracks in samples of nodular graphite cast iron is characterized using laboratory X-ray computed tomography. The cracks grow from laser machined artificial defects, their development is monitored in situ using laboratory X-ray computed tomography The combination of both techniques gives access to the 3D displacement field at the tip of the crack (mainly mode I opening).
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