Damage characterization of red sandstones using uniaxial compression experiments.
Damage characterization of red sandstones using uniaxial compression experiments.
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基于单轴压缩实验的红砂岩损伤表征
DOI：
10.1039/c8ra06972g
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发表时间：
2018-11-28
期刊：
影响因子：
3.9
通讯作者：
Yu, Bin
中科院分区：
文献类型：
--
作者：
Zhao, Kui;Huang, Zhen;Yu, Bin
本文提出了基于声发射、裂纹体积应变、损伤统计本构模型和耗散能四种方法表征损伤变量的计算公式。上述四种方法表征的损伤变量之间存在正相关关系。声发射表征的损伤变量与应变曲线存在明显的拐点，损伤强度点位于拐点之前。声发射信号的高频和低频在损伤强度点之后都有所增加，且高频信号主要出现在损伤强度点之后，说明损伤强度点位于大量裂纹形成的起始点之前。以裂纹体积应变和应变为特征的损伤变量曲线不存在明显拐点；曲线在峰值应力点之前近似为一条直线，损伤强度点位于近似直线段起点之后。损伤变量最初变化很小，在损伤强度点前开始非线性增加；曲线在损伤强度点后近似为一条直线，曲线不存在明显的拐点。损伤变量在损伤强度点之前波动较小，在损伤强度点之后以近似线性的方式急剧增加。损伤强度点位于损伤变量开始急剧增加的拐点附近，耗散能是识别损伤强度点最有效的方法。以裂纹体积应变为特征的损伤变量值最大，以耗散能为特征的损伤变量值最小。裂纹体积应变表征的损伤变量值与声发射表征的损伤变量值高度一致，表明裂纹体积应变是与声发射最密切相关的参数。
This paper proposes calculation formulae for damage variables that are characterized by four methods based on acoustic emission (AE), crack volume strain, a damage statistic constitutive model, and dissipation energy. Damage variables characterized by the four abovementioned methods are positively correlated to each other. An obvious inflection point exists in the curve of the damage variable characterized by AE and the strain, and the damage strength point is located before the inflection point. Both the high and low frequencies of the AE signals increase after the damage strength point, and the high-frequency signals mainly appear after the damage strength point, indicating that the damage strength point is located before the starting point for the formation of a large quantity of cracks. No obvious inflection point exists in the curve of the damage variable characterized by the crack volume strain and the strain; the curve is approximately a straight line before the peak stress point, and the damage strength point is located after the starting point of the approximate straight-line segment. Damage variable initially changes very slightly and begins to increase nonlinearly before the damage strength point; the curve is approximately a straight line after the damage strength point, and no obvious inflection point exists in the curve. Damage variable fluctuates slightly before the damage strength point and increases sharply in an approximately linear manner after the damage strength point. The damage strength point is located near the inflection point at which the damage variable begins to increase sharply, and the dissipation energy is the most effective method to identify the damage strength point. The value of the damage variable characterized by the crack volume strain is the largest whereas that characterized by the dissipation energy is the smallest. The value of the damage variable characterized by the crack volume strain is highly consistent with that of the damage variable characterized by AE, indicating that the crack volume strain is the most closely related parameter to AE.
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DOI：
10.1016/0148-9062(94)90005-1
发表时间：
1994-12-01
期刊：
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES & GEOMECHANICS ABSTRACTS
影响因子：
--
作者：
MARTIN, CD;CHANDLER, NA
通讯作者：
CHANDLER, NA
影响因子：
3.6
作者：
Martin, CD
通讯作者：
Martin, CD
DOI：
10.1016/j.ijrmms.2004.09.008
发表时间：
2004-12-01
影响因子：
7.2
作者：
Lau, JSO;Chandler, NA
通讯作者：
Chandler, NA
影响因子：
6.2
作者：
Kim, Jin-Seop;Lee, Kyung-Soo;Cho, Gye-Chun
通讯作者：
Cho, Gye-Chun
影响因子：
0.8
作者：
KULAKOV, GI;YAKOVITSKAYA, GE
通讯作者：
YAKOVITSKAYA, GE