Effects of joint filling thickness on crack propagation behaviors

SONG Yanqi; LI Xiangshang; LIU Jichen; WANG Pengyi

doi:10.11883/bzycj-2019-0358

Volume 40 Issue 8

Aug. 2020

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SONG Yanqi, LI Xiangshang, LIU Jichen, WANG Pengyi. Effects of joint filling thickness on crack propagation behaviors[J]. Explosion And Shock Waves, 2020, 40(8): 083102. doi: 10.11883/bzycj-2019-0358

Citation:

SONG Yanqi, LI Xiangshang, LIU Jichen, WANG Pengyi. Effects of joint filling thickness on crack propagation behaviors[J]. Explosion And Shock Waves, 2020, 40(8): 083102. doi: 10.11883/bzycj-2019-0358

SONG Yanqi, LI Xiangshang, LIU Jichen, WANG Pengyi. Effects of joint filling thickness on crack propagation behaviors[J]. Explosion And Shock Waves, 2020, 40(8): 083102. doi: 10.11883/bzycj-2019-0358

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Effects of joint filling thickness on crack propagation behaviors

doi: 10.11883/bzycj-2019-0358

School of Mechanics and Civil Engineering, China University of Ming and Technology (Beijing), Beijing 100083, China

Received Date: 2019-09-17
Rev Recd Date: 2019-10-28

Available Online: 2020-06-25

Publish Date: 2020-08-01

Abstract

Abstract

To explore the effects of the thickness of joint-filling material on the dynamic fracture properties of cracks under impact load, the gypsum was used as the material filled into the prefabricated cracks in polymethyl methacrylate (PMMA) specimens, three-point bending impact tests were conducted on the PMMA specimens with different joint filling thicknesses by using a novel digital laser dynamic caustics experimental system. The experimental results show that the vertical prefabricated cracks propagate vertically upward toward the free surface under the same impact load, which is a tytical mode-Ⅰ crack, and the thicker the filling, the easier the vertical crack initiation. When the vertical crack propagates to the horizontal prefabricated crack, the energy gathering times of the horizontal prefabricated cracks in the specimens with a filling thickness of 1, 3 and 5 mm are 433, 2 200 and 2 580 μs, respectively. And the stress intensity factors of crack initiation are 635.2, 742.4 and 906.8 kN/m^3/2, respectively. It indicates that the thicker the filling, the more difficult the horizontal crack initiation. The horizontal prefabricated crack is a typical Ⅰ-Ⅱ composite crack. The thicker the joint filler, the more curved the propagation path of the horizontal prefabricated crack. When the distance between the crack and the upper boundary of the specimen is 3 mm, the horizontal crack propagates towards the upper boundary of the specimen, and the specimen finally breaks. It is found that the distances between the fracture points and the impact load points of the specimens with the filling thicknesses of 1, 3 and 5 mm are 16.5, 11.0 and 6.0 mm, respectively.
- joint filler,
- dynamic caustics,
- impact load,
- stress intensity factor

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References(18)

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