Multi-scale analysis of the early damage mechanics of ferritized ductile iron

Fernandino, D.O.; Cisilino, A. P.; Toro, S.; Sánchez, P.J.

Multi-scale analysis of the early damage mechanics of ferritized ductile iron

Fernandino, D.O.,Cisilino, A. P.,Toro, S.,Sánchez, P.J.

Published: 2017
Publisher: Springer
Repository: upcommons.upc.edu
Language: en

Abstract

A multi-scale analysis of the linear elastic and the early damage stages of ferritic ductile iron is introduced in this work. The methodology combines numerical and experimental analyses in the macro and micro scales. Experiments in the micro-scale are used for the characterization of the material micro constituents and the assessment of the micro-scale damage mechanisms; experiments in the macro-scale provide the data to calibrate and validate the models. The 2D multi-scale problem is modeled using the pre-critical regime of the Failure-Oriented Multi-Scale Variational Formulation, which is implemented via a FE2 approach. Finite element analysis in the micro-scale is customized to account for plastic deformation and matrix-nodule debonding. The multi-scale model is found effective for capturing the sequence and extent of the damage mechanisms in the micro-scale and to estimate, via inverse analyses, parameters of the matrix-nodule debonding law. Results allow to develop new insights for the better understanding of the ductile iron damage mechanics and to draw conclusions related to the modeling aspects of the multi-scale simulation.

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Manuscript-Rev Click here to download Manuscript Manuscript-Rev.docx !. Click here to view linked References 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Multi-scale analysis of the early damage mechanics of ferritized ductile iron D. O. Fernandino1 ·, A.P. Cisilino1, S. Toro2•3, P.J. Sanchez 2•3 1 /NTEMA, Universidad Nacional de Mar del Plata-CONICET, Av. Juan 8 Justo 4302, Mar del Plata, B760BFDQ, Argentina 2 CIMEC-UNL-CONICET, Güemes 3450, CP 3000, Santa Fe, Argentina 3 G/MNl-UTN-FRSF, Lavaise 610, CP 3000, Santa Fe, Argentina *Author E-mail: [email protected] Telephone/fax: +54 (223) 4816600 / +54 (223) 481-0046 Abstract A multi-scale analysis of the linear elastic and the early damage stages of ferritic ductile iron is introduced in this work. The methodology combines numerical and experimental analyses in the macro and micro scales. Experiments in the micro-sea le are used for the characterization of the material micro constituents and the assessment of the micro-sea le damage mechanisms; experiments in the macro-sea le provide the data to calibrate and validate the models. The 20 multi-scale problem is modeled using the pre-critica! regime of the Failure-Oriented Multi-Scale Variational Formulation (FOMF), which is implemented via a FE 2 approach. Finite element analysis in the micro-sea le is customized to account for plastic deformation and matrix-nodule debonding. The multi-scale model is found effective for capturing the sequence and extent of the damage mechanisms in the micro-scale and to estímate, via inverse analyses, parameters ofthe matrix-nodule debonding law. Results allow to develop new insights for the better understanding of the ductile iron damage mechanics and to draw conclusions related to the modeling aspects of the multi-scale simulation. Keywords: Ductile iron; fracture mechanisms; mechanical testing; mu/ti-sea/e damage; finite elements. Abbreviations: DI: Ductile lron. FDI: Ferritic Ductile lron. FTF: First to Freeze zone. LTF: Last to Freeze zone. RVE: Representative Volume Element. MNI: Matrix-Nodule Interface. MND: Matrix-Nodule Decohesion. 1 International Journal of Fracture, 2017. ISSN: 0376-9429 (Print) 1573-2673 (Online) International Journal of Fracture, 2017. ISSN: 0376-9429 (Print) 1573-2673 (Online) International Journal of Fracture, 2017. ISSN: 0376-9429 (Print) 1573-2673 (Online)