3-Dimensional analysis of fatigue crack fields and crack growth by in situ synchrotron X-ray tomography

DOI: 10.1016/j.ijfatigue.2023.107541

Authors: A. Koko (University of Oxford) , S. Singh (University of Oxford) , S. Barhli (University of Oxford) , T. Connolley (Diamond Light Source) , N. T. Vo (Diamond Light Source) , T. Wigger (University College London) , D. Liu (University of Bristol) , Y. Fu (University of Oxford) , J. Réthoré (INSA Lyon) , J. Lechambre (INSA Lyon) , J.-Y. Buffiere (INSA Lyon) , T. J. Marrow (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: International Journal Of Fatigue , VOL 170

State: Published (Approved)
Published: May 2023
Diamond Proposal Number(s): 12585

Abstract: The propagation rate of a fatigue crack in a nodular cast iron, loaded in cyclic tension, has been studied in situ by X-ray computed tomography and digital volume correlation. The semi-elliptical crack initiated from an asymmetric corner notch and evolved to a semi-circular shape, initially with a higher growth rate towards one edge of the notch before the propagation rate along the crack front became essentially independent of po-sition. The phase congruency of the displacement field was used to measure the crack shape. The three-dimensional stress intensity factors were calculated via a linear elastic finite element model that used the displacement fields around the crack front as the boundary conditions. Closure of the crack tip region was observed. The cyclic change in the local mode I opening of the crack tip determined the local fatigue crack propaga-tion rate along the crack front.

Journal Keywords: Cast iron; Crack closure; Crack growth rate; Elliptical cracks; Stress intensity factors

Subject Areas: Materials, Engineering


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 30/01/2023 17:16

Documents:
1-s2.0-S0142112323000427-main.pdf

Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology Metallurgy

Technical Tags:

Imaging Tomography