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有色金属工程:2020,(9):-
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基于围道积分及网格重剖分下的SCB裂纹扩展数值模拟研究
竹宇波
(浙江同济科技职业学院)
Numerical Simulation of SCB Crack Growth Based on Circumference Integral and Mesh Resection
Zhu Yu-bo
(Department of Architecture and Civil Engineering,Zhejiang Tongji Vocational College of Science and Technology,Hangzhou,Zhejiang,311231)
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投稿时间:2020-03-30    修订日期:2020-04-22
中文摘要: 针对以往研究对裂纹扩展具有诸多限制,且较少利用断裂力学理论的不足,基于Abaqus平台,利用围道积分及网格重剖分技术,实现了基于断裂力学的裂纹自由扩展数值模拟,对SCB模型进行了应力强度因子及裂纹扩展过程数值仿真,结果表明:对SCB模型的仿真结果与国际岩石力学学会(ISRM)的理论结果一致;(2)I型应力强度因子随着a/R和S/R的比值的增加而增加,II型应力强度因子随裂纹倾角先增大后减小。当YI值为0时,试样受到纯II型作用,对于S/R=0.8的SCB模型,只有在a/R=0.7及α=65°时才出现II型裂纹扩展模式。纯模II的裂纹角随裂纹长度比的增大而减小,但随跨高比(S/R)的增大而增大;对裂纹扩展过程进行了数值模拟,裂纹从裂纹尖端发生,朝着上加载点处扩展。裂纹角度增大时,裂纹起始角的值增大,而其值随跨度比的增大而减小(S/R),此外,裂纹起始角的值随裂纹长度比(a/R)先增后减。裂纹起裂角几乎发生在裂纹长度比(a/R)为0.5情况。
Abstract:In view of the limitation of crack propagation in previous studies and the shortage of fracture mechanics theory, based on Abaqus platform, the numerical simulation of crack free propagation based on fracture mechanics is realized by using the method of confining channel integral and mesh resection. The results show that the SCB model is consistent with the theoretical results of the International Society of Rock Mechanics (ISRM). 。 when the yi value is 0, the specimen is subjected to pure type ii. for the scb model with s/r =0.8, type ii crack propagation mode appears only at a/r =0.7 and α=65°. the crack angle of the pure die ii decreases with the increase of the crack length ratio, but increases with the increase of the span height ratio (s/r); the crack growth process is numerically simulated, and the crack occurs from the crack tip and propagates towards the upper loading point. When the crack angle increases, the value of the crack starting angle increases and its value decreases with the increase of the span ratio (S/R). Moreover, the value of the crack starting angle increases first with the crack length ratio (a/R) Less. the crack initiation angle almost occurs when the crack length ratio (a/r) is 0.5.
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基金项目:国家自然科学基金“基于本体和约束理论的统一时空数据模型研究”(编号:51569004)
引用文本:
竹宇波.基于围道积分及网格重剖分下的SCB裂纹扩展数值模拟研究[J].有色金属工程,2020,(9):.

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