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Elucidating the Mechanism of Fatigue Crack Acceleration Following the Occurrence of an Underload

DOI: 10.1002/adem.v18.12 DOI Help

Authors: Enrico Salvati (University of Oxford) , Tan Sui (University of Oxford) , Hongjia Zhang (University of Oxford) , Alexander J. G. Lunt (University of Oxford) , Kai Soon Fong (University of Oxford) , Xu Song (University of Oxford) , Alexander M. Korsunsky (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Engineering Materials , VOL 18 , PAGES 2076 - 2087

State: Published (Approved)
Published: December 2016
Diamond Proposal Number(s): 11882

Abstract: Fatigue Crack Growth Rate (FCGR) is altered by a single anomalous load exceeding cyclic maximum (Overload) or compressive load below cyclic minimum (Underload). The authors study fatigue crack acceleration due to a single compressive Underload using residual stress mapping (by synchrotron XRD) and crack closure analysis (by DIC). The relative influence and duration of these two principal causes of FCGR alteration are revealed. Validated FEA model is used for parametric analysis of the effect of baseline cyclic loading ratio and magnitude of Underload on the cyclic J-integral.

Subject Areas: Engineering


Instruments: B16-Test Beamline