高应变率下水泥砂浆劈拉强度试验研究
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金陵科技学院建筑工程学院

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TQ177.6 2

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Experimental research on splitting strength of cement mortarat high strain rates
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    摘要:

    采用直径为74mm的分离式霍普金森压杆(SHPB)设备对水泥砂浆在高应变率下的抗拉力学特性进行试验研究,受载试件采用平台巴西圆盘试样。通过控制不同气压,获得了50/s-342/s应变率范围内的水泥砂浆动态抗拉力学性能。为了凸显平台巴西圆盘试样的合理性,试验结果还与传统的巴西圆盘试样进行了对比。试验结果表明,水泥砂浆的劈拉强度,峰值应变及弹性模量随应变率的提高而提高,试验得出的动态强度增长因子(DIF)值随应变率的变化趋势与欧洲-国际混凝土协会(CEB)提出的模型比较吻合。破坏模式与应变率有一定关系,剪切破坏区的大小随着应变率的提高而提高。作为间接测量准脆性材料抗拉力学性能的方法,平台巴西圆盘试样优于巴西圆盘试样。

    Abstract:

    Splitting Hopkinson pressure bar which diameter is 74mm was used to investigate the tensile mechanical properties of cement mortar flattened Brazilian disc under high strain rate. Dynamic mechanical behavior of cement mortar under the strain rate from 50/s to 342/s was obtained by controlling different air pressure. Comparison was made with traditional Brazilian disc to verify the rationality of the experiment. The result shows that the splitting strength, the critical strain and the Young’s modulus increase with the increase of the strain rate, DIF obtained by experiment is in agreement with the model provided by CEB. And the pattern of fracture is related to the strain rate, the shear fracture area increase with the increase of the strain rate. Flattened Brazilian disc is better than Brazilian disc as a way of measuring tensile mechanical behavior of brittle materials indirectly.

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陈晓洪. 高应变率下水泥砂浆劈拉强度试验研究[J]. 科学技术与工程, 2014, 14(20): .
Chen Xiao-hong. Experimental research on splitting strength of cement mortarat high strain rates[J]. Science Technology and Engineering,2014,14(20).

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  • 收稿日期:2014-02-19
  • 最后修改日期:2014-03-20
  • 录用日期:2014-04-01
  • 在线发布日期: 2014-07-18
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