应变率对高延性水泥基复合材料基本力学性能的影响

Effect of strain rate on the basic mechanical properties ofhigh ductility cementitious composites

为探究应变率对高延性水泥基复合材料(HDCC)基本力学性能的影响,对掺有聚乙烯醇(PVA)纤维和碳酸钙晶须的HDCC进行了压缩性能和拉伸性能试验。研究结果表明:HDCC具有明显的应变率效应,随着应变率由10^-5 s^-1提升至10^-2 s^-1,HDCC的抗拉强度和抗压强度均有较大幅度的提升,但拉伸应变和拉伸韧性出现明显的劣化;在不同应变率下,引入碳酸钙晶须能够有效提高HDCC的拉伸性能和压缩性能。

In order to explore the effect of strain rate on the mechanical properties of high ductility cementitious composites(HDCC),the compressive and tensile properties of HDCC containing polyvinyl alcohol fiber(PVA)and calcium carbonate whisker were studied.The results show that HDCC had an obvious strain rate effect.With the increase of the strain rate from 10^-5/s to 10^-2/s,the tensile stress and compressive strength of HDCC significantly increased,while the tensile strain and tensile toughness obviously degraded.Under different strain rates,the introduction of calcium carbonate whisker could effectively improve the tensile properties and compression strength of HDCC.