水泥砂浆应变率效应研究
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摘要
为分析试件长径比和应变率对水泥砂浆动态力学性能的影响规律,采用准静态实验测量了砂浆的单轴压缩强度、弹性模量以及泊松比.利用分离式SHPB压杆进行1维应力压缩实验,对水泥砂浆试件进行了回收和比较,获得了不同长径比水泥砂浆试样在不同加载速率下的动态损伤破坏过程和应力应变曲线,研究了动态强度增强因子随应变率的变化规律.结果表明:动态压缩强度随应变率的增加而显著增大;试件直径相同时,厚度小的获得的动态强度增强因子要小于厚度大的;随着应变率提高,试件损伤增加,碎块尺寸越小,表明破坏能量随应变率的增加而提高.
To investigate the influence of strain rate on stress-strain relation and dynamic strength, uniaxial compression strength, elastic modulus and poisson's ratio of mortar were measured by quasi-static experiments.The one-dimensional stress experiment was carried out by using split Hopkinson pressure bar(SHPB), dynamic damage and stress-strain relation of the cement mortar with various length-diameter ratios at different loading rates were obtained,and the relation of DIF(dynamic strength increase factor) and strain rate was studied.The results show that dynamic compressive strength increases significantly with increasing strain rate.The DIF with thin specimens are smaller than those with thick specimens when diameters are the same, but length-diameter ratios are different.By comparing the recovered specimens, as the strain rate increases, the damage of the specimen increases, and the fragment size decreases.It is found that the failure energy increases with the growing of the strain rate.
To investigate the influence of strain rate on stress-strain relation and dynamic strength, uniaxial compression strength, elastic modulus and poisson's ratio of mortar were measured by quasi-static experiments.The one-dimensional stress experiment was carried out by using split Hopkinson pressure bar(SHPB), dynamic damage and stress-strain relation of the cement mortar with various length-diameter ratios at different loading rates were obtained,and the relation of DIF(dynamic strength increase factor) and strain rate was studied.The results show that dynamic compressive strength increases significantly with increasing strain rate.The DIF with thin specimens are smaller than those with thick specimens when diameters are the same, but length-diameter ratios are different.By comparing the recovered specimens, as the strain rate increases, the damage of the specimen increases, and the fragment size decreases.It is found that the failure energy increases with the growing of the strain rate.
引文
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[12] Grady D E.Local inertial effects in dynamic fragmentation[J].Journal of Applied Physics,1982(1):322-327.
[2] 施绍裘,王礼立.水泥砂浆石在一维与准一维应变状态下动态力学响应的比较和讨论[J].岩石力学与工程学报,2001,20(3):327-331.Shi Shaoqiu,Wang Lili.Discussion on dynamic mechanicalbehaviors of cement mortar under quasi-one and one dimensional strain states[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(3):327-331.(in Chinese)
[3] 施绍裘,陈江瑛,李大红,等.水泥砂浆石在准一维应变下的动态力学性能研究[J].爆炸与冲击,2000,20(4):326-332.Shi Shaoqiu,Chen Jiangying,Li Dahong,et al.Study on the dynamic mechanical behavior of cement mortar under quasi-one dimensional strain state[J].Explosion & Shock Waves,2000,20(4):326-332.(in Chinese)
[4] Grote D L,Park S W,Zhou M.Dynamic behavior of concrete at high strain rates and pressures:I.experimental characterization[J].International Journal of Impact Engineering,2001,25(9):869-886.
[5] 胡时胜,王道荣.冲击载荷下混凝土材料的动态本构关系[J].爆炸与冲击,2002,22(3):242-246.Hu Shiseng,Wang Daorong.Dynamic constitutive relation of concrete under impact[J].Explosion & Shock Waves,2002,22(3):242-246.(in Chinese)
[6] Zhou J,Ge L.Effect of strain rate and water-to-cement ratio on compressive mechanical behavior of cement mortar[J].Journal of Central South University,2015,22(3):1087-1095.
[7] 中华人民共和国住房和城乡建设部.JGJ/T_98-2010_砌筑砂浆配合比设计规程[S].北京:中国建筑工业出版社,2010.Ministry of Housing and Urban-Rural-Development of the People′s Republic of China.JGJ / T_98-2010_Specification for mix proportion design of masonry mortar[S].Beijing:China Architecture & Building Press,2010.(in Chinese)
[8] 中华人民共和国住房和城乡建设部.JGJ 70—2009 建筑砂浆基本性能试验方法标准[S].北京:中国建筑工业出版社,2009.Ministry of Housing and Urban-Rural-Development of the People's Republic of China.JGJ / 70—2009_Standard for test method of basic properties of construction mortar[S].Beijing:China Architecture & Building Press,2009.(in Chinese)
[9] 邹笃建,刘铁军,滕军,等.混凝土柱单轴动态抗压特性的应变率效应研究[J].振动与冲击,2012,31(2):145-150.Zou Dujian,Liu Tiejun,Teng Jun,et al.Strain rate effect on uniaxial compressive behaviour of concrete columns[J].Journal of Vibration & Shock,2012,31(2):145-150.(in Chinese)
[10] Anon.CEB-FIP model code 1990[M].[S.l.]:Bulletin Dinformation,1993.
[11] Tedesco J W,Ross C A.Strain-rate-dependent constitutive equations for concrete[J].Journal of Pressure Vessel Technology,1998,120(4):398-405.
[12] Grady D E.Local inertial effects in dynamic fragmentation[J].Journal of Applied Physics,1982(1):322-327.