中南大学学报（自然科学版）2017，Vol.48Issue(6)：1607-1614,8.DOI:10.11817/j.issn.1672-7207.2017.06.026
横观各向同性岩石亚临界裂纹扩展实验研究
Experimental study for subcritical crack growth of transverse isotropy rock
摘要
Abstract
Subcritical crack growth in transverse isotropy slate was investigated experimentally using constant displacement load relaxation method on MTS insight electronic tensile testing machine.The relationship between the stress intensity factor K1 and the crack velocity v and the fracture toughness K1c were obtained by the test.The growth behavior of subcritical crack was connected with different joint inclination angles.The results show that lgKI-lgv relationships are in accordance with linear rule,i.e.when the joint inclination angle α is in the range of 0° to 45°,the regression parameter a increases with the increase of α and the regression parameter b decreases with the increase of α,and when the joint inclination angle α is in the range of 45° to 90°,a decreases with the increase of α and the regression parameter b is just the opposite.The change laws of subcritical crack growth parameters 4 and n are the same with those of the factors a and b,respectively.Both the fracture toughness KIC and the relaxation maximum load Pmax obey the "U"shaped parabolic distribution.When α is in the range of 0° to 45°,these two factors decrease with the increase of α,and when α is in the range of 45° to 90°,these two factors increase with the increase of α.In addition,the two factors reach the maximum value when the angle is 0° and reach the minimum when the angle is 45.关键词
MTS Insight电子拉力试验机/横观各向同性/常位移松弛法/亚临界裂纹扩展/断裂韧度Key words
MTS Insight electronic tensile testing machine/transverse isotropy/constant displacement load relaxation method/subcritical crack growth/fracture toughness分类
建筑与水利引用本文复制引用
王思青,李江腾,王聪聪..横观各向同性岩石亚临界裂纹扩展实验研究[J].中南大学学报（自然科学版）,2017,48(6):1607-1614,8.基金项目
国家自然科学基金资助项目(51374246,51304240) （51374246,51304240）
湖南省科技计划项目(2013FJ6002)(Projects(51374246,51304240)supported by the National Natural Science Foundation of China （2013FJ6002）
Project(2013FJ6002) supported by Plan of Science and Technology of Hunan Province) （2013FJ6002）
