抗收缩ECC单轴拉压力学性能及损伤本构模型

摘要/Abstract

摘要： 工程水泥基复合材料(ECC)是一种新型纤维增强材料,具有良好的延性和微裂缝控制能力。因ECC不含粗骨料,在成型初期易出现收缩裂缝,通过加入膨胀剂可有效抑制其成型收缩。本文通过加入高性能硫铝酸钙(HCSA)膨胀剂制备抗收缩ECC,研究了HCSA对ECC拉、压力学性能的影响。结果表明:当HCSA掺量为4%(质量分数)时,可提高ECC单轴抗拉和抗压强度。为了描述ECC的力学性能,从有效应力角度,基于损伤变量模拟ECC的单轴拉、压力学行为,提出了ECC受拉损伤演化方程,建立了ECC单轴损伤本构模型并植入ABAQUS有限元程序,对试验进行了模拟分析。结果表明:所提出的ECC单轴损伤本构模型能够较好地描述ECC在单轴受拉和受压过程的力学行为和损伤演化过程,其参数简单,易于标定。

关键词: 工程水泥基复合材料, 损伤演化方程, 抗收缩, 本构模型, ABAQUS

Abstract: Engineering cementitious composite (ECC) is a new type of fiber-reinforced material with good ductility and microcrack control capability. Because ECC does not contain coarse aggregate, shrinkage cracks are easy to appear in the early stage of molding, and its molding shrinkage can be effectively suppressed by adding an expansion agent. In this paper, shrinkage-resistatant ECC was prepared by adding high-performance calcium sulfoaluminate (HCSA) expansion agent, and the effects of HCSA on the tensile and compressive mechanical properties of ECC were investigated. The results show that when HCSA doping is 4% (mass fraction), the uniaxial tensile and compressive strength of ECC can be increased. In order to describe the mechanical properties of ECC, the uniaxial tensile and compressive behaviors of ECC were simulated based on the damage variables from the perspective of the effective stress, and the tensile damage evolution equation for ECC was proposed. The uniaxial tensile and compressive damage constitutive model of ECC was developed and implanted into the ABAQUS finite element program to simulate the tests. The results show that the proposed uniaxial damage constitutive model of ECC can better describe the mechanical behavior and damage evolution of ECC during monotonic tension and monotonic compression, and its parameters are simple and easy to calibrate.

Key words: engineering cementitious composite, damage evolution equation, shrinkage resistance, constitutive model, ABAQUS

中图分类号:

TU528

陈宇, 宋学伟, 吴佳梁. 抗收缩ECC单轴拉压力学性能及损伤本构模型[J]. 硅酸盐通报, 2024, 43(9): 3137-3148.

CHEN Yu, SONG Xuewei, WU Jialiang. Uniaxial Tensile and Compressive Mechanical Properties of Shrinkage-Resistant ECC and Damage Constitutive Model[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3137-3148.

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