Experimental study on crack propagation of brittle materials based on DIC under explosive loading

SUN Qiang; LI Xuedong; YAO Tengfei; GAO Chun

doi:10.11883/bzycj-2018-0308

Volume 39 Issue 10

Oct. 2019

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Article Navigation > Explosion And Shock Waves > 2019 > 39(10): 103102

SUN Qiang, LI Xuedong, YAO Tengfei, GAO Chun. Experimental study on crack propagation of brittle materials based on DIC under explosive loading[J]. Explosion And Shock Waves, 2019, 39(10): 103102. doi: 10.11883/bzycj-2018-0308

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SUN Qiang, LI Xuedong, YAO Tengfei, GAO Chun. Experimental study on crack propagation of brittle materials based on DIC under explosive loading[J]. Explosion And Shock Waves, 2019, 39(10): 103102. doi: 10.11883/bzycj-2018-0308

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Experimental study on crack propagation of brittle materials based on DIC under explosive loading

doi: 10.11883/bzycj-2018-0308

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

Received Date: 2018-08-21
Rev Recd Date: 2019-04-07

Available Online: 2019-09-25

Publish Date: 2019-10-01

Abstract

Abstract

In this paper, the digital image correlation method is used to test the tip position of the brittle material in the explosion loading strip, the stress intensity factor calculation considering the inertia effect and the crack propagation law. Firstly, the symmetry experimental model is used to realize the intuitive positioning of the crack tip, and the more accurate full-field strain and displacement information is recorded. By analyzing the main strain field at the crack tip, the maximum strain point cannot be used as the crack tip. Judgments based. Secondly, based on the fracture dynamics, the crack propagation length, the crack propagation velocity and the displacement information of the data points in a certain area of the tip are obtained according to the crack tip position. The differential principle and the least squares Newton iteration method are used to calculate the inertial effect. The stress intensity factor of the I-II hybrid crack, wherein the K_I maximum is 2.63 MPa·m^1/2 and the minimum value is 0.89 MPa·m^1/2. The overall trend of K_II has remained basically the same, but due to the complexity of the late stage of the model, the crack propagation direction changes and the mutation occurs; Then, the overall trend of the stress intensity factor shows that the crack propagation of the brittle material develops in a cyclically decreasing manner with the energy accumulation and release under explosive loading conditions, but the variation range is relatively large when crack initiation and crack arrest occur, and in the test. The late expansion crack is an I-II hybrid type. Finally, the crack propagation length and stress intensity factor change trend are compared with the actual test results. The two are basically the same, which indicates that the test method and the theoretical calculation result can be well matched, and the experimental precision is high, which is feasible.
- digital image correlation method,
- blast load,
- brittle material,
- stress intensity factor,
- crack propagation

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References

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