I型裂纹动态断裂参量的应变片测试方法研究

doi:10.13722/j.cnki.jrme.2017.1542

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摘要基于冲击荷载作用下的三点弯曲试验，开展I型裂纹动态断裂力学参量的应变片测试方法研究。通过沿裂纹运动路径布置多点应变片，结合线弹性断裂力学裂纹尖端应变场解析解，提出动态裂纹断裂力学参量的特定锐角和钝角2种应变片测试方法。给出应变片与裂纹运动路径间特定锐角和钝角值，建立表征裂纹尖端位置及其周边应变场二项式，进而计算出裂纹运动速度和动态应力强度因子。结果表明，2种应变片方法测定的裂纹运动速度以及锐角应变片方法确定的动态应力强度因子，与同步进行的动焦散线试验结果相近；与动焦散线方法相比，钝角应变片方法确定的裂纹动态应力强度因子在试件中部相差较小，其余位置相差较大。研究结果为应变片方法在岩石材料I型裂纹动态断裂参量测定中的应用提供了试验支撑。

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	李清1
	于强1
	张随喜1
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	田策1
	钱路1
	李娜1

关键词 ：岩石力学, 应变片, I型裂纹, 动态应力强度因子, 运动速度

Abstract：The measurement of dynamic fracture parameters of mode-I crack with the strain gauge was performed through the three-point bending tests under impact loading. Based on the analytical solution of strain field around crack tip derived according to the linear elastic fracture mechanics，two strain gauge methods for the measurement of dynamic fracture parameters of mode-I crack were proposed. A couple of stain gauges were mounted along the crack track at the specific orientation angles of acute and obtuse. The specific acute and obtuse angles between the strain gauge and running crack track were given. A two-parameter formula was established to characterize the crack tip location and the strain field around it. Thus，both the running speed and dynamic stress intensity factor (DSIF) of the crack tip can be precisely calculated. The running speed obtained from both the acute and obtuse strain gauge method and DSIF calculated from the obtuse strain gauge method were close to results from the caustics experiments that conducted simultaneously. In addition，the difference between DSIF of the dynamic caustics method and the obtuse strain gauge method was small in the middle of the specimen，and was large in other positions.

Key words： rock mechanics strain gage mode-I crack dynamic stress intensity factor running speed

引用本文:

李清1，于强1，张随喜1，2，田策1，钱路1，李娜1. I型裂纹动态断裂参量的应变片测试方法研究[J]. 岩石力学与工程学报, 2018, 37(6): 1430-1437.
LI Qing1，YU Qiang1，ZHANG Suixi1，2，TIAN Ce1，QIAN Lu1，LI Na1. Strain gauge method for the measurement of dynamic fracture parameters of mode-I crack. , 2018, 37(6): 1430-1437.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1542 或 http://www.rockmech.org/CN/Y2018/V37/I6/1430

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