| 中心直裂纹平台巴西圆盘复合型动态应力强度因子 |
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| 引用本文： | 汪坤,冯峰,王启智.中心直裂纹平台巴西圆盘复合型动态应力强度因子[J].力学与实践,2009,31(2):40-45. |
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| 作者姓名： | 汪坤 冯峰 王启智 |
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| 作者单位： | 四川大学土木工程及力学系 |
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| 基金项目： | 国家自然科学基金(10472075);;水力学与山区河流开发保护国家重点实验室自主研究课题的资助. |
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| 摘 要： | 为了指导用中心直裂纹平台巴西圆盘(CSTFBD)试样进行岩石复合型动态断裂
试验，利用有限元法首先验证了文献中对中心直裂纹巴西圆盘(CSTBD)得到的有关结果,分析
比较了不同无量纲裂纹长度(即裂纹半长和圆盘半径之比)时两种圆盘的I, II型动态应力
强度因子的时间历程，发现两者的差异大部分在10{\%}以内，同时验证了该文数值方法的可
靠性. 然后讨论了CSTFBD试样I, II型动态应力强度因子的复合比、起裂角以及纯II型加
载角. 研究成果可为复合型动态断裂试验中CSTFBD试样的加工、试样上应变片的粘贴、起裂
方向和起裂时间的估计等提供参考.
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| 关 键 词： | 复合型动态断裂 中心直裂纹平台巴西圆盘 动态应力强度因子 加载角 起裂角 |
| 收稿时间： | 2007-8-29 |
MIXED MODE DYNAMIC STRESS INTENSITY FACTORS OF CRACKED STRAIGHT THROUGH FLATTENED BRAZILIAN DISC SPECIMENS |
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| WANG Kun
,
Feng Feng
,
Wang Qizhi.MIXED MODE DYNAMIC STRESS INTENSITY FACTORS OF CRACKED STRAIGHT THROUGH FLATTENED BRAZILIAN DISC SPECIMENS[J].Mechanics and Engineering,2009,31(2):40-45. |
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| Authors: | WANG Kun Feng Feng Wang Qizhi |
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| Affiliation: | +;*;2;Department of Civil Engineering and Applied Mechanics;Sichuan University;Sichuan 610065;China;State Key Laboratory of Hydraulics and Mountain River Engineering;China |
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| Abstract: | In order to establish a standard for the test of mixed mode
dynamic fracture of rock with the cracked straight through flattened
Brazilian disc (CSTFBD) specimen, we use finite element method first to
check the related results in literature on the cracked straight through
Brazilian disc specimen (CSTBD). The I-II mixed mode dynamic stress
intensity factors (SIFs) of the two kinds of discs with different
dimensionless crack lengths (i.e. the half length of the crack normalized by
the radius of the specimen) are obtained to show that
the differences of the dynamic SIF's time history between these two kinds
of specimens are within 10{\%}, and the numerical method used in this paper
is valid. Then for CSTFBD specimens, the I-II mixed ratio, the angle of
crack initiation, and the loading angle for pure mode II fracture test
are obtained. The results are useful for mixed mode dynamic
fracture test of CSTFBD, including specimens preparation, the location and
directional alignment of the strain gages,
as well as the estimation for the crack initiation time and
the crack initiation direction. |
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| Keywords: | mixed mode dynamic fracture cracked straight throughflattened Brazilian disc (CSTFBD) dynamic stress intensity factors loadingangle crack initiation angle |
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