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| Strain gauge method for the measurement of dynamic fracture parameters of mode-I crack |
| LI Qing1，YU Qiang1，ZHANG Suixi1，2，TIAN Ce1，QIAN Lu1，LI Na1 |
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2. Huozhou Coal Electricity Group Co.，Ltd.，Huozhou，Shanxi 031400，China) |
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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.
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2018, Vol. 37 
