Coupled effects of high temperature and strain rate on compressive properties of hybrid fiber UHTCC
Coupled effects of high temperature and strain rate on compressive properties of hybrid fiber UHTCC
复制标题
高温和应变速率对混合纤维 UHTCC 压缩性能的耦合影响
DOI：
10.1617/s11527-019-1391-4
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发表时间：
2019-08
影响因子：
3.8
通讯作者：
Chen Bokun
中科院分区：
文献类型：
--
作者：
Zhao Xin;Xu Shilang;Li Qinghua;Chen Bokun
利用分离式霍普金森压杆研究了应变速率和温度对混杂纤维超高韧性水泥基复合材料（UHTCCs）压缩性能的综合影响。首先将样品加热至不同的暴露温度，例如环境温度，200、400、500、600和800 °C，随后冷却至环境温度。此后，在四种不同的应变速率下测试试样。试验结果表明，UHTCC的动态抗压强度在200 °C时有所提高，随后随着暴露温度的升高而降低。随着暴露温度的升高，UHTCC的应变速率敏感性大大增强。通过对试样表面裂纹扩展过程的高速摄影和断口纤维状态的显微观察，探讨了这种现象的可能机理。此外，建立了一个经验关系来表示火灾损伤UHTCC的动态强度增强作为应变率的函数。
This study investigates the combined effect of the strain rate and temperature on the compressive properties of hybrid fiber ultra high toughness cementitious composites (UHTCCs) using a Split Hopkinson pressure bar. Specimens were first heated to different exposure temperatures, e.g. ambient temperature, 200, 400, 500, 600 and 800 °C, and subsequently, cooled to ambient temperature. Thereafter, the specimens were tested at four different strain rates. The test results show that the dynamic compressive strength of the UHTCC is enhanced at a temperature of 200 °C, and subsequently, decreases with the increase in exposure temperature. The strain rate sensitivity of UHTCC is largely enhanced with the increase in exposure temperature. The possible mechanism of this phenomenon was discussed based on the high-speed photography of the crack propagation process on the surface of the specimens and microscopic observation of fibers condition on their fracture surfaces. Moreover, an empirical relationship is established to express the dynamic strength enhancement of fire-damaged UHTCC as a function of strain rate.
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影响因子：
2.5
作者：
Hans W. Reinhardt;J. Weerheijm
通讯作者：
Hans W. Reinhardt;J. Weerheijm
影响因子：
3.8
作者：
P. Rossi;J. Mier;C. Boulay;F. Maou
通讯作者：
P. Rossi;J. Mier;C. Boulay;F. Maou
影响因子：
3.8
作者：
Rossi, P;Toutlemonde, E
通讯作者：
Toutlemonde, E
影响因子：
10.5
作者：
M. Colombo;M. Prisco;R. Felicetti
通讯作者：
M. Colombo;M. Prisco;R. Felicetti
影响因子：
7.4
作者：
Ahmed, Shaikh Faiz Uddin;Maalej, Mohamed;Paramasivam, P.
通讯作者：
Paramasivam, P.