Effects of loading rates on concrete double-K fracture parameters
Effects of loading rates on concrete double-K fracture parameters
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DOI：
10.1016/j.engfracmech.2015.09.027
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发表时间：
2015-11-01
影响因子：
5.4
通讯作者：
Xu, Shilang
中科院分区：
文献类型：
--
作者：
Hu, Shaowei;Zhang, Xiufang;Xu, Shilang
通过试验和分析研究了加载速率对混凝土双K断裂参数的影响。采用10(5)/S至10(2)/S四种加载速率。结果表明，随着加载速率的增加，起裂韧性线性增加，失稳断裂韧性先增加后恒定。还证实了双K断裂模型可以进一步推广到更宽的动加载率，如地震动力激励。最后，建立了加载速率对双K断裂韧性参数影响的模型。(C)2015爱思唯尔有限公司。保留所有权利。
The effects of loading rates on concrete double-K fracture parameters were investigated using central-notched split tension cubes, both experimentally and analytically. Four loading rates varying from 10 (5)/s to 10 (2)/s was adopted. Results showed that, with the increase of loading rates, the initiation fracture toughness linearly increased while the unstable fracture toughness varied by a first increase and a followed constant trend. It was also confirmed that double-K fracture model may be further extended to wider dynamic loading rates, such as seismic dynamic excitation. Finally, the models describing the loading rate influences on double-K fracture toughness parameters were developed. (C) 2015 Elsevier Ltd. All rights reserved.