In situ 3D characterization of fatigue cracks displacement fields

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).

Keywords

• Cast iron
• Digital volume correlation
• Crack tip displacement
• In situ