摘要
针对胶凝砂砾石材料微观力学性能的研究成果较少的问题,以及胶凝砂砾石材料界面过渡区的存在性问题,提出了胶凝砂砾石不同相的确定方法以及界面过渡区尺寸的确定方法.结合纳米压痕试验,绘制微观力学性能图像,采用系统聚类法对测试矩阵内的测试点进行分类.在试验阶段,考虑到胶凝砂砾石的材料特性,完善了“30-2-30”测试制度,通过荷载-深度曲线结合Oliver-Pharr方法求出胶凝材料硬度H为0.18 GPa,折合模量Er为13.13 GPa,砂砾石材料硬度H为8.60 GPa,折合模量Er为84.56 GPa.在计算阶段,采用系统聚类法确定界面过渡区范围,确定其尺寸约为18μm.
In response to the lack of research results on the micro mechanical properties of cementitious sand gravel materials and the uncertainty on the existence of interfacial transition zones,a method for determining the different phases of cementitious sand gravel and the size of interfacial transition zones is proposed.Combining the nanoindentation testing,the micro mechanical performance images are obtained,and the system clustering method is used to classify the test points in the test matrix.In the experimental stage,considering the material characteristics of cementitious sand and gravel,the testing system of"30-2-30"is improved.Based on the load depth curve and combining the Oliver phar method,the hardness H of the cementitious material is calculated as 0.18 GPa,corresponding to the reduced modulus Er of 13.13 GPa,and the hardness H of the gravel material is calculated as 8.60 GPa,corresponding to the reduce modulus Er of 84.56 GPa.In the calculation stage,the system clustering method is used to determine the range of the interface transition zone,and its size is determined to be approximately 18μm.
作者
林章焕
杨海霞
邵婷悦
王树严
LIN Zhanghuan;YANG Haixia;SHAO Tingyue;WANG Shuyan(College of Materials and Meterials,Hohai University,Nanjing 211100,Jiangsu,China)
出处
《力学季刊》
CAS
CSCD
北大核心
2024年第2期462-472,共11页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(U1965207)。
关键词
纳米压痕
胶凝砂砾石
系统聚类法
界面过渡区
nanoindentation
cement sand-gravel materials
hierarchical clustering method
interfacial transition zone
