Dynamic fracture processes of L-shaped beam-column specimens with prefabricated cracks

LI Qing; XUE Yaodong; YU Qiang; XU Wenlong; WEI Guihua

doi:10.11883/bzycj-2017-0255

Volume 38 Issue 3

Feb. 2018

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Article Navigation > Explosion And Shock Waves > 2018 > 38(3): 491-500

LI Qing, XUE Yaodong, YU Qiang, XU Wenlong, WEI Guihua. Dynamic fracture processes of L-shaped beam-column specimens with prefabricated cracks[J]. Explosion And Shock Waves, 2018, 38(3): 491-500. doi: 10.11883/bzycj-2017-0255

Citation:

LI Qing, XUE Yaodong, YU Qiang, XU Wenlong, WEI Guihua. Dynamic fracture processes of L-shaped beam-column specimens with prefabricated cracks[J]. Explosion And Shock Waves, 2018, 38(3): 491-500. doi: 10.11883/bzycj-2017-0255

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Dynamic fracture processes of L-shaped beam-column specimens with prefabricated cracks

doi: 10.11883/bzycj-2017-0255

School of Mechanics and Architecture Engineering, China University of Mining and Technology, Beijing 100083, China

Received Date: 2017-07-07
Rev Recd Date: 2017-09-25
Publish Date: 2018-05-25

Abstract

Abstract

The dynamic propagation mechanics of prefabricated crack and its effect on joint were studied for the impact fracture process of L-shaped beam-column specimens with prefabricated cracks. The drop testing was carried out on the specimens with cracks at different distances l far from node core area by using the digital dynamic caustic system and the variations of crack propagation trajectory, velocity and dynamic stress-intensity factor were obtained. The results show that the increase of l leads to the angle between the penetration point of the extended crack at the edge of the beam and the prefabricated crack increases gradually and the degree of crack curving becomes larger. With the increase of l, the oscillation of crack propagation velocity increases, the average velocity decreases and the crack propagation time is gradually prolonged. When the value of l is 2 mm, the fracture pattern is mode Ⅰ. As the value of l increases, the crack tip is increased by the shear stress, the dynamic stress intensity factor of mode Ⅰ decreases and the dynamic stress intensity factor of mode Ⅱ gradually increases. The fracture pattern gradually becomes Ⅰ-Ⅱ complex mode.
- beam-column specimen,
- impact,
- caustic,
- dynamic fracture,
- prefabricated crack,
- stress intensity factor

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References(20)

References

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