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Experimental study on influence of wetting-drying cycle on dynamic fracture and energy dissipation of red-sandstone
Journal of Building Engineering ( IF 6.4 ) Pub Date : 2021-04-28 , DOI: 10.1016/j.jobe.2021.102619
Bin Du , Qiangqiang Cheng , Leigang Miao , Junqiang Wang , Haibo Bai

To study the influence of the wetting-drying cycles and loading rate on dynamic fracture toughness and energy dissipation of rocks under the dynamic loads, the split Hopkinson pressure bar (SHPB) system was used to perform the dynamic impact tests on NSCB specimens of red sandstone after different wetting-drying cycles. The loading rate response characteristics of fracture toughness of specimens after different wetting-drying cycles were analyzed, and the energy dissipation law of dynamic fracture under the impact loads was obtained. The results show that under a given number of wetting-drying cycles, with the increase of loading rate, the dynamic fracture toughness shows an overall trend of increasing. When the critical loading rate K˙IC is exceeded, the dynamic fracture toughness no longer increases. At the fixed loading rate, the dynamic fracture toughness of red sandstone decreases linearly with the increase of wetting-drying cycles, and the higher the loading rate, the more sensitive the fracture toughness to the wetting-drying cycle. With the increase of the loading rate, the dynamic fracture energy increases exponentially and becomes more sensitive to the loading rate. Under the fixed wetting-drying cycles, the dynamic fracture toughness of red sandstone has a logarithmic relationship with the increase of fracture energy.



中文翻译:

干湿循环对红砂岩动态断裂及能量耗散影响的实验研究

为了研究干湿循环和加载速率对动载荷作用下岩石动态断裂韧度和能量耗散的影响,采用分裂霍普金森压力棒(SHPB)系统对红砂岩NSCB试件进行了动态冲击试验。经过不同的干湿循环。分析了不同干湿循环后试样断裂韧性的加载速率响应特性,得出了冲击载荷下动态断裂的能量耗散规律。结果表明,在一定的干湿循环条件下,随着加载速率的增加,动态断裂韧度总体呈上升趋势。临界负荷率ķ˙我知道了超过动态断裂韧性不再增加。在一定的加载速率下,红砂岩的动态断裂韧度随干湿循环次数的增加而线性减小,且加载速率越高,其断裂韧度对干湿循环越敏感。随着加载速率的增加,动态断裂能呈指数增加,并且对加载速率变得更加敏感。在固定的干湿循环下,红砂岩的动态断裂韧度与断裂能的增加呈对数关系。

更新日期:2021-05-11
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