The Effect of Initial Defects on Overall Mechanical Properties of Concrete Material |
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Authors: | Yunfa Zhang Xiaozhou Xia Zhenjie Wu Qing Zhang |
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Affiliation: | 1.Department of Engineering Mechanics, Hohai University, Nanjing, 210098, China. |
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Abstract: | Considering the fact that the initial defects, like the imperfect interfacial
transition zones (ITZ) and the micro voids in mortar matrix, weaken the mechanical
properties of concrete, this study develops corresponding constitutive models for ITZ and
matrix, and simulates the concrete failure with finite element methods. Specifically, an
elastic-damage traction-separation model for ITZ is constructed, and an anisotropic
plastic-damage model distinguishing the strength-difference under tension and
compression for mortar matrix is proposed as well. In this anisotropic plastic-damage
model, the weakening effect of micro voids is reflected by introducing initial isotropic
damage, the distinct characteristic of tension and compression which described by
decomposing damage tensor into tensile and compressive components, and the plastic
yield surface which established on the effective stress space. Furthermore, by tracking the
damage evolution of concrete specimens suffering uniaxial tension and compression, the
effects of imperfect status of ITZ and volume fraction of initial voids on the concrete
mechanical properties are investigated. |
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Keywords: | Imperfect ITZ initial voids anisotropic plastic-damage constitutive mesoscale concrete |
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