木屑-氯氧镁水泥复合材料力学性能及损伤本构模型研究

doi:10.16552/j.cnki.issn1001-1625.2024.1017

摘要/Abstract

摘要： 木屑-氯氧镁水泥复合材料(SMOCC)是以氯氧镁水泥为胶凝材料,木屑为填充材料,并掺加适当比例改性剂,施加5 MPa压力压制成型的新型建筑材料。为了探究SMOCC的基本力学性能和损伤演化规律,本文开展了立方体抗压、劈裂抗拉和不同加载速率下棱柱体受压试验。同时,基于试验结果,采用Lognormal和GaussAmp统计分布函数,结合等效应变原理,建立了不同加载速率下SMOCC的损伤构模型。结果表明:立方体抗压强度、劈裂抗拉强度及弹性模量均随着SMOCC表观密度的增大而增大;SMOCC峰值应变和峰值应力均随着加载速率的升高而减小;较低加载速率下,SMOCC内部缺陷及微裂纹发展更充分,应力-应变曲线初始压实阶段上凹更明显,脆性特征有所改善;与Lognormal统计分布函数相比,GaussAmp统计分布函数建立的本构模型能够更好地描述SMOCC单轴受压力学行为和损伤演化过程。研究成果可为SMOCC的设计和应用提供理论依据。

关键词: 木屑-氯氧镁水泥复合材料, 力学性能, 加载速率, 损伤变量, 本构模型

Abstract: Sawdust-magnesium oxychloride cement composite (SMOCC) is a kind of new building material incorporating magnesium oxychloride cement as cementitious material, sawdust as filling material, mixed with appropriate proportion of modifiers, and pressed and molded under 5 MPa pressure. In order to investigate the basic mechanical properties and damage evolution of SMOCC, cubic compression, cubic split tensile and prism compression tests at different loading rates were carried out. At the same time, based on the experimental results, the statistical damage constitutive models of SMOCC under different loading rates were established by using Lognormal and GaussAmp statistical distribution functions, respectively, combined with the equivalent strain principle. The results show that the cubic compressive strength, splitting tensile strength, and elastic modulus increase with the increase of apparent density. The peak strain and peak stress of SMOCC decrease with the increase of loading rate. At lower loading rates, the internal defects and micro-cracks of SMOCC develop more fully, the concave of the initial compaction section of the stress-strain curve is more obvious, and the brittle failure of the material is improved. Compared with the Lognormal statistical distribution function, the constitutive model established by the GaussAmp statistical distribution function is able to better describe the uniaxial compressive mechanical behavior and damage evolution process of SMOCC. The research results can provide a theoretical basis for the design and application of SMOCC.

Key words: sawdust-magnesium oxychloride cement composite, mechanical property, loading rate, damage variable, constitutive model

中图分类号:

TU528

冯沛洋, 方强, 张华刚, 喻涛, 杨娇娇, 宁攀. 木屑-氯氧镁水泥复合材料力学性能及损伤本构模型研究[J]. 硅酸盐通报, 2025, 44(2): 434-446.

FENG Peiyang, FANG Qiang, ZHANG Huagang, YU Tao, YANG Jiaojiao, NING Pan. Mechanical Properties and Damage Constitutive Models of Sawdust-Magnesium Oxychloride Cement Composite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(2): 434-446.

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