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International Journal for Multiscale Computational Engineering
IF: 1.016 5-Year IF: 1.194 SJR: 0.452 SNIP: 0.68 CiteScore™: 1.18

ISSN Print: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v3.i2.40
pages 161-176

Effect of Interlamellar Spacing on the Constitutive Behavior of Pearlitic Steels Via Damage and Multiscale Analysis

Xiao-Feng Peng
Laboratory of Phase Change and Interfacial Transport Phenomena, Department of Thermal Engineering, Tsinghua University, Beijing 100084
J. Fan
Department of Engineering Mechanics, Chongqing University Chongqing, 400044, China
W. Pi
Department of Engineering Mechanics, Chongqing University Chongqing, 400044, China

ABSTRACT

The effect of interlamellar spacing on the constitutive behavior of pearlitic steels is investigated through the analysis of the damage in each phase of the materials and using a multiscale approach. A pearlitic material is composed of numerous colonies with randomly distributed orientations, each of which is further composed of numerous fine lamellas of ferrite and cementite. Between each pair of ferrite and cementite lamellas, a thin transient interfacial lamella is assumed. Each of the three phases is considered as an elastoplastic medium with some pattern of microdefect. Based on the concept of energy-release-rate and continuum damage mechanics as well as the geometric characteristics of microdefects in different phases, a unified damage evolution law is obtained. It explicitly contains the interlamellar spacing, accounting for the better mechanical properties of pearlitic materials with smaller interlamellar spacing. The constitutive description for a single pearlitic colony is derived using the obtained damage and its evolution, and taking into account its lamellar microstructure. The description for pearlitic steels is obtained with the Hill's self-consistent scheme. The response of BS11 subjected to asymmetric stress cycling is analyzed. The satisfactory agreement between the computed and experimental results demonstrates the validity of the proposed model.


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