On the isotropic elastic constants of graphite nodules in ductile cast iron: Analytical and numerical micromechanical investigations

被引:25
作者
Andriollo, Tito [1 ]
Hattel, Jesper [1 ]
机构
[1] Tech Univ Denmark, Dept Mech Engn, DK-2800 Lyngby, Denmark
关键词
Micromechanics; Ductile cast iron; Spheroidal graphite iron; Graphite nodules; Isotropic effective elastic moduli; MECHANICAL-PROPERTIES; CELL MODEL; YOUNGS MODULUS; VOID GROWTH; DAMAGE; BEHAVIOR; FRACTURE; SPHERULITES; BOUNDS; MICROSTRUCTURE;
D O I
10.1016/j.mechmat.2016.02.007
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A comprehensive description of the mechanical behavior of nodules in ductile iron is still missing in the published literature. Nevertheless, experimental evidence exists for the importance of such graphite particles during macroscopic material deformation, especially under compressive loading. In the present paper, the nodules' elastic properties are thoroughly investigated by means of both analytical and numerical techniques. The analysis takes into account the influence of several non-linear phenomena, as local residual stresses arising during solid-state cooling, interface debonding and limited particle strength. It is shown that if the nodule internal structure is considered, the traditional isotropy assumption leads to the definition of a domain of admissible values for the effective elastic constants. However, micromechanical calculations indicate that values within the domain do not provide mesoscopic moduli in agreement with Young's modulus and Poisson's ratio recorded for common ferritic ductile iron grades. This suggests that graphite nodules may not be considered isotropic at the microscopic scale, at least from a mechanical viewpoint. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码:138 / 150
页数:13
相关论文
共 58 条
[11]  
Boccaccini AR, 1997, Z METALLKD, V88, P23
[12]   Micromechanical modeling of ductile cast iron incorporating damage. Part I: Ferritic ductile cast iron [J].
Bonora, N ;
Ruggiero, A .
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 2005, 42 (5-6) :1401-1424
[13]   Micromechanical modelling of the damage and toughness behaviour of nodular cast iron materials [J].
Brocks, W ;
Hao, S ;
Steglich, D .
JOURNAL DE PHYSIQUE IV, 1996, 6 (C6) :43-52
[14]   Effective properties of nodular cast-iron: A multi-scale computational approach [J].
Carazo, F. D. ;
Giusti, S. M. ;
Boccardo, A. D. ;
Godoy, L. A. .
COMPUTATIONAL MATERIALS SCIENCE, 2014, 82 :378-390
[16]   Investigation of elastic property relationships for flake and spheroidal cast irons using Raman spectroscopy [J].
Cooper, CA ;
Elliott, R ;
Young, RJ .
ACTA MATERIALIA, 2002, 50 (16) :4037-4046
[17]   Graphite nodules and fatigue crack propagation micromechanisms in a ferritic ductile cast iron [J].
Di Cocco, V. ;
Iacoviello, F. ;
Rossi, A. ;
Cavallini, M. ;
Natali, S. .
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 2013, 36 (09) :893-902
[18]   Graphite nodules influence on DCIs mechanical properties: experimental and numerical investigation [J].
Di Cocco, Vittorio ;
Iacoviello, Daniela ;
Iacoviello, Francesco ;
Rossi, Alessandra .
XXIII ITALIAN GROUP OF FRACTURE MEETING, IGFXXIII, 2015, 109 :135-143
[19]   A study of physico-chemical mechanisms responsible for damage of heat treated and as-cast ferritic spheroidal graphite cast irons [J].
Dierickx, P ;
Verdu, C ;
Reynaud, A ;
Fougeres, R .
SCRIPTA MATERIALIA, 1996, 34 (02) :261-268
[20]  
Dong M.J., 1997, Advanced Materials Research, V4-5, P181, DOI [10.4028/www.scientific.net/AMR.4-5.181, DOI 10.4028/WWW.SCIENTIFIC.NET/AMR.4-5.181]