Experimental and numerical analysis of hydrogen interaction with plastic strain in a high strength steel

Flavien Vucko 1, 2, 3 Cédric Bosch 1, 2, 3 David Delafosse 1, 2, 3
1 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel
2 MPI-ENSMSE - Département Mécanique physique et interfaces
3 SMS-ENSMSE - Centre Science des Matériaux et des Structures
Abstract : Cyclic loading tests were performed on micro-notched samples of high-strength steel S690QT in air and under cathodic polarisation in a saline solution. These specimens were modelled and their behaviour simulated by finite elements calculations with a combined nonlinear isotropic-kinematic hardening constitutive law. This model can simulate cyclic softening and ratcheting effect of the high-strength steel. Stress and strain fields in the vicinity of the notch-tip were calculated. Results show that a strong dependence of the crack initiation with plastic strain accumulation. Hydrogen assisted cracking mechanism is discussed based on arrangements of dislocations structures.
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Communication dans un congrès
European Federation of Corrosion. European Corrosion Congress - Eurocorr 2012, Sep 2012, Istanbul, Turkey. Paper 1223, 2012
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Flavien Vucko, Cédric Bosch, David Delafosse. Experimental and numerical analysis of hydrogen interaction with plastic strain in a high strength steel. European Federation of Corrosion. European Corrosion Congress - Eurocorr 2012, Sep 2012, Istanbul, Turkey. Paper 1223, 2012. 〈emse-01063843〉

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