[1] Guo Liping, , Yang Yanan, et al. A uniaxial tensile constitutive equationof high-ductility cementitious composites [J]. Journal of Southeast University (English Edition), 2019, 35 (4): 476-481. [doi:10.3969/j.issn.1003-7985.2019.04.010]

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A uniaxial tensile constitutive equationof high-ductility cementitious composites()

高延性水泥基复合材料单轴拉伸本构关系

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

35

Issue:

2019 4

Page:

476-481

Research Field:

Other Disciplines

Publishing date:

2019-12-30

Info

Title:

A uniaxial tensile constitutive equationof high-ductility cementitious composites

高延性水泥基复合材料单轴拉伸本构关系

Author(s):

Guo Liping^{1, 2, 3}, Yang Yanan^{1, 2, 3}, Chen Bo⁴

¹School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
²Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
³Collaborative Innovation Centre for Advanced Civil Engineering Materials, Southeast University, Nanjing 211189, China
⁴State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China

郭丽萍^{1, 2, 3}, 杨亚男^{1, 2, 3}, 陈波⁴

¹东南大学材料科学与工程学院, 南京 211189; ²东南大学江苏省土木工程材料重点实验室, 南京 211189; ³东南大学先进土木工程材料协同创新中心, 南京 211189; ⁴南京水利科学研究院水文水资源与水利工程科学国家重点实验室, 南京 210029

Keywords:

uniaxial tensile;  constitutive equation;  simplified model;  high-ductility cementitious composites

单轴拉伸;  本构方程;  简化模型;  高延性水泥基复合材料

PACS:

TV431

DOI:

10.3969/j.issn.1003-7985.2019.04.010

Abstract:

In order to establish the constitutive relationship of high-ductility cementitious composites(HDCCs)under uniaxial tensile load and to guide the structural design of HDCCs, based on the analysis of the existing uniaxial tensile constitutive relationship and ideal elastoplastic linear strain-hardening model, a bilinear tensile constitutive equation of HDCCs was proposed. The points of nominal initial cracking and nominal maximum stress were adopted as control points of the line segment, and the constitutive relationship of HDCCs was established. Five series of uniaxial tensile stress-strain curves of HDCCs were combined to perform an experimental application of the constitutive equation, along with an analysis of the key parameters. The experimental results confirm the ability of the constitutive equation to overcome the problem of insufficient or excessive redundancy of existing models in terms of calculation bearing capacity. Specifically, the measured maximum stress value is larger than the nominal value, and the ratio between the two values ranges from 1.08 to 1.22. Additionally, the tensile strain at the softening point obtained by fitting a straight line with the valley points of the strain-hardening stage curve is greater than or equal to the tensile strain at the measured maximum stress point and the ratio of the fitted values to the measured values ranges from 1.00 to 1.19.

为了建立高延性水泥基复合材料(HDCC)在单轴拉伸荷载作用下的本构关系, 指导HDCC的结构设计, 在分析与总结现有单轴拉伸本构关系的基础上, 基于理想弹塑性线性强化模型, 以名义初裂点和名义最大应力点为控制点, 提出了HDCC单轴拉伸双线性本构方程, 结合5组HDCC单轴拉伸应力-应变曲线, 进行了拉伸本构方程的应用示范与控制点关键参数的分析比较.结果表明:所提出的本构方程克服了现有模型在计算承载力时富余度不足或过高的问题;实测最大应力值大于名义值, 两者之比为1.08~1.22;通过应变硬化阶段曲线的谷值点拟合直线所得到的软化点拉伸应变值大于或等于实测最大应力点的拉伸应变值, 两者的比值为1.00~1.19.

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Memo

Memo:

Biography: Guo Liping(1979—), female, doctor, associate professor, guoliping691@163.com.
Foundation items: The National Key Research and Development Program of China(No.2018YFC0406701), the National Natural Science Foundation of China(No.51778133, 51739008).
Citation: Guo Liping, Yang Yanan, Chen Bo. A uniaxial tensile constitutive equation of high-ductility cementitious composites[J].Journal of Southeast University(English Edition), 2019, 35(4):476-481.DOI:10.3969/j.issn.1003-7985.2019.04.010.

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