利用TWSRC试件进行砂岩与PMMA脆性材料裂纹断裂特性研究

doi:10.13722/j.cnki.jrme.2018.1305

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摘要不同脆性材料在冲击载荷作用下，起裂时间、裂纹扩展速度及动态起裂韧度等断裂力学参数将呈现不同的表现形式。选择青砂岩、红砂岩、黑砂岩及PMMA(polymethyl methacrylate) 4种脆性材料作为研究对象，采用TWSRC(tunnel with single radial crack)试件，结合裂纹扩展计对预制裂纹的起裂时刻及扩展时刻进行测试，结合试验–数值法对动态起裂韧度进行计算，并采用有限差分法程序对试件的破坏行为进行数值分析，将冲击试验结果与数值模拟结果进行对比分析，可以得到以下结论：(1) 裂纹平均扩展速度随着脆性材料弹性模量的增加逐渐增大，而起裂时间呈现反比例关系；(2) 脆性材料的动态起裂韧度随着脆性材料弹性模量的增加而逐渐增大；(3) 在冲击载荷作用下，3种岩石材料的破坏形式与PMMA的破坏形式有很大差别。

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	周磊
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	周昌林

关键词 ：岩石力学, 脆性材料, TWSRC, 裂纹扩展速度, 起裂时间, 起裂韧度

Abstract：The fracture parameters such as crack initiation time，crack propagation velocity and dynamic crack initiation toughness of different brittle materials will be different under impact loads. In this paper，the crack propagation characteristics of four types of common brittle materials including green sandstone，red sandstone，black sandstone and PMMA(polymethyl methacrylate) were investigated under dynamic loading.. The crack propagation velocity and crack initiation time were measured by utilizing TWSRC(tunnel with single radial crack) samples and crack propagation gauges(CPG)，and the initiation fracture toughness was calculated by experimental-numerical approach. The failure behaviors of the TWSRC samples were analyzed by the finite difference code AUTODYN. Through comparisons between the test results and the numerical results，some significant conclusions were obtained as follows. The crack propagation velocity increases with increasing the elastic modulus of the brittle materials and，conversely，the crack initiation time decreases. The dynamic crack initiation toughness of brittle materials increases with increasing the elastic modulus of the brittle materials. Under the same impact loading，the failure behaviors of three types of rock materials are greatly different from those of PMMA.

Key words： rock mechanics brittle material TWSRC crack propagation velocity crack initiation time crack initiation toughness

引用本文:

周磊，朱哲明，董玉清，范勇，邓帅，周昌林. 利用TWSRC试件进行砂岩与PMMA脆性材料裂纹断裂特性研究[J]. 岩石力学与工程学报, 2019, 38(5): 888-899.
ZHOU Lei，ZHU Zheming，DONG Yuqing，FAN Yong，DENG Shuai，ZHOU Changlin. Study on crack fracture characteristics of sandstone and PMMA brittle materials by utilizing TWSRC samples. , 2019, 38(5): 888-899.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1305 或 http://www.rockmech.org/CN/Y2019/V38/I5/888

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