| 三点弯曲混凝土梁能量释放率的有限元计算 |
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| 引用本文： | 丁军,曾祥国,廖林清,张俊乾,王放.三点弯曲混凝土梁能量释放率的有限元计算[J].重庆大学学报(自然科学版),2005,28(2):111-113. |
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| 作者姓名： | 丁军 曾祥国 廖林清 张俊乾 王放 |
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| 作者单位： | 重庆工学院,汽车学院,重庆,400050;重庆大学,资源与环境科学学院,重庆,400030;上海大学,应用数学与力学研究所,上海,200072 |
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| 摘 要： | 采用有限元分析方法(FEM)对三点弯曲混凝土梁的能量释放率进行了计算,在对混凝土梁进行单元划分时,避免使用奇异性单元来模拟梁的裂尖奇异性.在梁的中线上采用双重节点技术,逐步释放裂尖单元节点的方法来模拟裂纹的扩展.基于虚拟裂纹闭合方法,分别对不同裂纹长度的混凝土梁进行了计算.计算结果表明,用该方法计算出来的能量释放率与理论值有很好的吻合性,证实了该方法的可行性.
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| 关 键 词： | 三点弯曲梁 能量释放率 有限元法 应力强度因子 |
| 文章编号： | 1000-582X(2005)02-0111-03 |
| 修稿时间： | 2004年8月25日 |
Evaluation of the Energy Release Rate of Three-point-bending Beam Using Finite Element Method |
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| DING Jun,ZENG Xiang-guo,LIAO Lin-qing,ZHANG Jun-qian,WANG Fang.Evaluation of the Energy Release Rate of Three-point-bending Beam Using Finite Element Method[J].Journal of Chongqing University(Natural Science Edition),2005,28(2):111-113. |
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| Authors: | DING Jun ZENG Xiang-guo LIAO Lin-qing ZHANG Jun-qian WANG Fang |
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| Abstract: | Calculation of the energy release rate with finite element method (FEM ) is conducted. The concrete beam model is meshed using a method without need of considering the crack-tip singular element. Two columns of nodes, which belong to the right-and left-parts of the beam, respectively, are generated on the central line of the model and released one after another in a proper sequence. Energy release rate is evaluated based on the virtual crack closure technique. Comparison between the calculated values and theoretical values is made, which shows that they are in good agreement. |
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| Keywords: | three-point-bending beam the energy release rate finite element method stress intensity factor |
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