PSI - Issue 17

Available online at www.sciencedirect.com StructuralIntegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2019) 000 – 000 ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 17 (2019) 872–877

ICSI 2019 The 3rd International Conference on Structural Integrity Estimation of the plastic zone in fatigue through the thickness based on synchrotron diffraction data M. Carrera a , P. Lopez-Crespo a *, Y. H. Tai b , J. R. Yates c , B. Moreno a , T. Buslaps d , P.J. Withers e a Department of Civil and Materials Engineering, University of Malaga, Malaga 29071, Spain ICSI 2019 The 3rd International Conference on Structural Integrity Estimation of the plastic zone in fat gue through the thickness based on synchrotron diffraction data M. Carrera a , P. Lopez-Crespo a *, Y. H. Tai b , J. R. Yates c , B. Moreno a , T. Buslaps d , P.J. Withers e a Department of Civil and Materials Engineering, University of Malaga, Malaga 29071, Spain b Rolls-Royce plc, PO Box 31, Derby DE24 8BJ, UK c Sheffield Fracture Mechanics, Derbyshire S18 1QD, UK d ESRF, 6 rue J Horowitz, 38000 Grenoble, France e School of Materials, University of Manchester, Grosvenor St., Manchester M13 PL, UK b Rolls-Royce plc, PO Box 1, Derby DE24 8BJ, UK c Sheffield Frac ure echanics, De byshire S18 1QD, UK d ESRF, 6 rue J Horowitz, 38000 Grenoble, France e School of Materials, University of Manchester, Grosvenor St., Manchester M13 PL, UK In this work we present a novel methodology to analyse the extent of crack tip plasticity inside engineering materials. The plastic zone developed ahead of a fatigue crack in a bainitic steel compact tension specimen is studied. The bulk of the steel is probed with synchrotron X-ray diffraction technique to measure the elastic strain field deep inside the material. The procedure involves combining the experimental synchrotron data with numerical data to obtain the equivalent strain map. This map is then converted into a stress field where the boundary of the plastic zone can be directly extracted. The procedure is tested on a real fatigue crack and the results are compared to plane stress and plane strain models. The promising results will enable key progress on understanding the mechanisms that generate the damage at the tip of fatigue cracks in engineering components. Abstract In t i work we present a novel methodology analyse the extent of crack tip plastic ty inside engineering materials. The plastic z ne develop d ah ad of fatigue crack in bainitic steel compact tension sp cimen is studied. The bulk of the st el is prob with synchrotron X-ray diffraction technique to measur the elastic strain field eep inside the material. The procedure involves combining the exp riment l synchrotron data with numerical data to btain t e equivale t st ain map. This map is then converted i to a stress field wh re the boundary of th plastic zon can be directly extracted. Th proc dure is tested on a real fatigue crack and the results are compared to plane stress and plane strain models. The promising results will enable key progress on understanding the mechanisms that generate the damage at the tip of fatigue cracks in engineering components. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. P er-review under responsibility of th ICSI 2019 organizers. Keywords: Fatigue plastic zone, bainitic steel, synchrotron X-ray diffraction

Keywords: Fatigue plastic zone, bainitic steel, synchrotron X-ray diffraction

* Corresponding author. Tel.: +34951952398 E-mail address: plopezcrespo@uma.es

2452-3216© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. * Corresponding author. Tel.: +34951952398 E mail address: plopezcrespo@uma.es

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.116