ADI 1050-6 Mechanical Behavior at Different Strain Rates and Temperatures

Abstract:

An experimental characterization of the austempered ductile iron ISO 17804/JS/1050-6/S was performed carrying out tensile tests under different strain rates, temperatures and stress triaxiality levels. Then, composing a yield function surface, a hardening relation, and a damage criterion, a constitutive model was developed to describe the salient features of the observed macroscopic response. In particular, the Mohr-Coulomb yield function was selected to account for the pressure effect observed on the yield surface. A new hardening relation was proposed in order to account for both strain rate and temperature effects. The Bonora’s damage model, developed in the framework of the continuum damage mechanics, was adopted to capture the failure condition under different stress triaxiality levels. The damage model was appropriately modified to account for the effect of strain rate and temperature on the failure strain.

• Periodical: Materials Science Forum (Volume 925)
• Pages: 196-202
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.925.196
• Online since: June 2018
• Authors: Andrew Ruggiero*, Gianluca Iannitti, Stefano Masaggia, Federico Vettore
• Keywords: Austempered Ductile Iron (ADI), Constitutive Modeling, Continuum Damage Mechanics, High Strain Rate

References

[1] F. Zanardi, F. Bonollo, G. Angella, N. Bonora, G. Iannitti, A. Ruggiero, A contribution to new material standards for ductile irons and austempered ductile irons, Int. J. Metalcast. 11 (2017) 136-147.

DOI: 10.1007/s40962-016-0095-6

[2] F.J. Zerilli, R.W. Armstrong, Dislocation-mechanics-based constitutive relations for material dynamics calculations, J. Appl. Phys. 61 (1987) 1816-1825.

DOI: 10.1063/1.338024

[3] G. Iannitti, A. Ruggiero, N. Bonora, S. Masaggia, F. Veneri, Micromechanical modelling of constitutive behavior of austempered ductile iron (ADI) at high strain rate, Theor. Appl. Fract. Mec. 92 (2017) 351-359.

DOI: 10.1016/j.tafmec.2017.05.007

[4] W. Böhme, L. Reissig, Capability of new high strength ADI-Materials for automotive components under crash loading, Adv. Eng. Mater. 17 (2015) 1189-1196.

DOI: 10.1002/adem.201400435

[5] G.R. Johnson, W.H. Cook, A constitutive model and data for metals subjected to large strains, high strain rates and high temperatures, Proc. of the Seventh Int. Symp. on Ballistics 21 (1983) 541-547.

[6] A. Ruggiero, N. Bonora, D. Gentile, G. Iannitti, G. Testa, M. Hörnqvist Colliander, S. Masaggia, F. Vettore, Strain rate effects on fracture behavior of austempered ductile irons, submitted to AIP Conf. Proc. (2017).

DOI: 10.1063/1.5044837

[7] N. Bonora, A. Ruggiero, Micromechanical modeling of ductile cast iron incorporating damage. part i: Ferritic ductile cast iron, Int. J. Solids. Struct. 42 (2005) 1401-1424.

DOI: 10.1016/j.ijsolstr.2004.07.025

[8] J. Lemaitre and J.L. Chaboche, Mechanics of solid materials, Cambridge university press, (1994).

[9] N. Bonora, A nonlinear cdm model for ductile failure, Eng. Fract. Mech. 58 (1997) 11-28.

[10] A. Pirondi, N. Bonora, Modeling ductile damage under fully reversed cycling, Comp. Mater. Sci. 26 (2003) 129-141.

DOI: 10.1016/s0927-0256(02)00411-1