准静态和冲击荷载下应变硬化水泥基复合材料剪切性能研究

摘要/Abstract

摘要： 为探究应变硬化水泥基复合材料(SHCC)的复杂动态响应,采用特制的机械剪切测试装置与液压测试机,以及新设计的分离式霍普金森拉杆(SHTB)进行测试,以剪切跨度和切口深度为主要剪切参数。通过对两组剪切跨度(2、5 mm)、三组切口深度(3、5、7 mm)的试件进行剪切试验,研究了SHCC的准静态和冲击剪切行为,采用数字图像相关技术(DIC)监测试验过程中的变形和裂纹演化。研究结果表明,剪切跨度影响了SHCC的剪切行为。剪切跨度和切口深度可以控制剪切和拉伸破裂的传播,通过选择适当的剪切形状,可以实现主导试件的剪切破裂。较小的剪切跨度导致剪切力更高和主要剪切裂纹传播区域更窄,减弱了材料的性能。在准静态加载和冲击加载条件下,3 mm切口深度试件表现出较高的自我约束和更高的断裂力,试件为混合破坏模式(压缩-剪切)。而7 mm切口深度试件均表现出最有利的剪切破裂模式,具有垂直剪切裂缝,试件的剪切断裂以裂纹滑移为主。因此,7 mm切口深度试件在重力加载的SHTB测试可用于准确评估复杂矿物基材料的剪切特性。本研究可为水泥基复合材料性能优化的研究提供理论基础。

关键词: 应变硬化水泥基复合材料, 胶结复合材料, 数字图像相关技术, 准静态剪切, 冲击剪切, 材料性能

Abstract: In order to investigate the complex dynamic response of strain-hardening cement-based composites (SHCC), a specialized mechanical shear testing apparatus was employed in conjunction with a hydraulic testing machine and a newly designed split-Hopkinson tension bar (SHTB) for testing, with shear span and notch depth as the primary shear parameters. Shear tests were conducted on two sets of specimens with shear span of 2, 5 mm, and three sets of notch depth of 3, 5, 7 mm, to study the quasi-static and impact shear behavior of SHCC. Digital image correlation (DIC) was used to monitor deformation and crack evolution during the testing process. The research results reveal that shear span influences the shear behavior of SHCC. Shear span and notch depth can control the propagation of shear and tensile fractures, and by selecting an appropriate shear shape, dominant shear fracture of specimens can be achieved. Smaller shear span leads to higher shear forces and narrower areas of predominant shear crack propagation, weakening the material performance. Under both quasi-static and impact loading conditions, the 3 mm notch depth specimen exhibits higher self-confinement and higher fracture strength, displaying a mixed failure mode (compression-shear). On the other hand, the 7 mm notch depth specimen consistently demonstrates the most favorable shear fracture mode, characterized by vertical shear cracks, with shear fracture dominated by crack slip. Therefore, 7 mm notch depth specimen in gravity-loaded SHTB test can be used to accurately assess the shear characteristics of complex mineral-based materials. This study provides a theoretical basis for the optimization of cement-based composites performance.

Key words: strain-hardening cement-based composite, cementitious composite, digital image correlation, quasi-static shear, impact shear, material performance

中图分类号:

TU528

刘成, 刘一鸣, 叶群水, 胡涛. 准静态和冲击荷载下应变硬化水泥基复合材料剪切性能研究[J]. 硅酸盐通报, 2025, 44(3): 821-833.

LIU Cheng, LIU Yiming, YE Qunshui, HU Tao. Shear Properties of Strain-Hardening Cement-Based Composites under Quasi-Static and Impact Loads[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 821-833.

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