In this work the failure behavior of ductile cast iron microstructure subjected to tensile and low-cycle fatigue loadings is simulated by a 3-D, FE Reference Volume Element approach. A fully ferritic matrix is considered as representative of the low-hardness, high-ductility material class of nodular cast irons. Plastic flow potential rule, ductile and low cycle fatigue damage models are implemented at the micro-scale for the matrix constituent in conjunction with nonlinear cyclic hardening laws, and periodic boundary conditions are imposed over the RVE at the meso-scale. Different values of triaxiality are imposed. Numerical results confirm experimental findings of the behavior at the meso-scale and correctly predict the LCF lifetime, driving the interpretation of inner strain distribution, voids interaction and triaxiality effects on failure mechanisms.

Microstructure-based RVE modeling of the failure behavior and LCF resistance of ductile cast iron / Collini, L.; Pirondi, A.. - In: PROCEDIA STRUCTURAL INTEGRITY. - ISSN 2452-3216. - 24:(2019), pp. 324-336. [10.1016/j.prostr.2020.02.030]

Microstructure-based RVE modeling of the failure behavior and LCF resistance of ductile cast iron

Collini L.;Pirondi A.
2019-01-01

Abstract

In this work the failure behavior of ductile cast iron microstructure subjected to tensile and low-cycle fatigue loadings is simulated by a 3-D, FE Reference Volume Element approach. A fully ferritic matrix is considered as representative of the low-hardness, high-ductility material class of nodular cast irons. Plastic flow potential rule, ductile and low cycle fatigue damage models are implemented at the micro-scale for the matrix constituent in conjunction with nonlinear cyclic hardening laws, and periodic boundary conditions are imposed over the RVE at the meso-scale. Different values of triaxiality are imposed. Numerical results confirm experimental findings of the behavior at the meso-scale and correctly predict the LCF lifetime, driving the interpretation of inner strain distribution, voids interaction and triaxiality effects on failure mechanisms.
2019
Microstructure-based RVE modeling of the failure behavior and LCF resistance of ductile cast iron / Collini, L.; Pirondi, A.. - In: PROCEDIA STRUCTURAL INTEGRITY. - ISSN 2452-3216. - 24:(2019), pp. 324-336. [10.1016/j.prostr.2020.02.030]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2879735
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