3D打印水泥基材料高温后劈裂拉伸尺寸效应试验研究
Experimental study on the dimensional effect of splitting tensile of 3D printed cement-based material after high temperature
王旭 1陈琳1
作者信息
- 1. 江苏联合职业技术学院南京分院 土木工程系, 江苏 南京 210019
- 折叠
摘要
为探究3D打印水泥基材料高温后劈裂拉伸尺寸效应,共设置5种温度和3种尺寸,应用液压伺服机对3D打印水泥基材料展开劈裂拉伸力学性能试验研究,分析高温和尺寸效应对3D打印水泥基材料劈裂拉伸力学性能的影响规律.主要得到以下结论:随着温度升高,试件抗拉强度逐步降低,不同尺寸试件的抗拉强度受高温影响降低幅度基本相同,最大降低幅度为87.97%.随着尺寸增加,试件抗拉强度逐步降低,温度的提高导致试件抗拉强度受尺寸效应影响变化幅度逐步增大.受尺寸效应影响,不同试件高温后的抗拉强度变化区间为18.488%～26.165%.同时,基于尺寸效应律提出 3D打印水泥基材料高温下抗拉强度计算模型,并应用微观测试技术揭示其力学性能演化机理.
Abstract
In order to explore the size effect of splitting tensile of 3D printed cement-based materials after high temperature,the splitting tensile mechanical properties of 3D printed cement-based materials were tested by hydraulic servo machine under five tem-perature and three size conditions.The influence of high tempera-ture and size effect on the splitting tensile mechanical properties of 3D printed cement-based materials is analyzed.The main conclu-sions of this paper are as follows:with the increase of tempera-ture,the tensile strength of specimens decreases gradually,and the tensile strength of specimens with different sizes is basically the same under the influence of high temperature,with the maxi-mum decrease of 87.97%.With the increase of size,the tensile strength of the specimen gradually decreases,and the increase of temperature leads to the increase of the tensile strength affected by the size effect.Affected by the size effect,the tensile strength of the specimen changes in the range of 18.488%～26.165%after different high temperatures.At the same time,based on the size effect law,a calculation model of tensile strength of 3D printed ce-ment-based materials considering the influence factors of high tem-perature is proposed,and the evolution mechanism of its mechani-cal properties is revealed by microscopic testing technology.
关键词
3D打印水泥基材料/高温/尺寸效应/劈裂拉伸Key words
3D printed cement-based materials/high tempera-ture/size effect/splitting and stretching引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据