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Dynamic Caustic Line Experiment of Three-point Bending Beam with Different Crack Heights
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Qing LI, Bo-wen XU, Chen HUANG, Bing-bing YU, Kai WANG, Hui YUAN
Blasting | 2023, 40(4) : 13 - 19
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Blasting | 2023, 40(4): 13-19
• THEORETICAL AND TECHNOLOGICAL EXPLORATION •
Dynamic Caustic Line Experiment of Three-point Bending Beam with Different Crack Heights
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Qing LI, Bo-wen XU, Chen HUANG, Bing-bing YU, Kai WANG, Hui YUAN
Affiliations
  • School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Beijing 100083, China
Published: 2023-12-01 doi: 10.3963/j.issn.1001-487X.2023.04.002
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In order to explore the dynamic crack propagation law of beam members, bar defects with the heights of 22 mm, 28.5 mm and 35 mm were designed in a three-point bending beam, and then tested by the digital laser dynamic caustic line experiment system and the drop weight impact test system. The results show that the crack propagation rate and stress intensity factor are affected by the defect height in two stages in the drop weight impact experiment. In the first stage, the maximum growth rates of crack propagation have a trend of first rising and then stabilizing as 247.49 m/s, 292.49 m/s and 284.99 m/s with the increase of defect height, and the cracking stress intensity factor was respectively 1.480 MPa/m3/2, 1.665 MPa/m3/2 and 1.812 MPa/m3/2, which increased with the increase of defect height. Meanwhile, the crack initiation and propagation rates respectively decreased by 634.42 m/s, 524.97 m/s and 377.67 m/s, the cracking stress intensity factors of KⅠ type respectively decreased by 3.281 MPa/m3/2, 3.192 MPa/m3/2 and 2.876 MPa/m3/2, and the cracking stress intensity factors of KⅡ type respectively increased by 1.254 MPa/m3/2, 1.319 MPa/m3/2, and 1.398 MPa/m3/2. Furthermore, the KⅠ-KⅡ composite stress intensity factor was transformed into a KⅠ type stress intensity factor by deflection.

caustic line experiment system  /  stripy flaw  /  crack propagation speed  /  stress intensity factor
Qing LI, Bo-wen XU, Chen HUANG, Bing-bing YU, Kai WANG, Hui YUAN. Dynamic Caustic Line Experiment of Three-point Bending Beam with Different Crack Heights[J]. Blasting, 2023 , 40 (4) : 13 -19 . DOI: 10.3963/j.issn.1001-487X.2023.04.002
Funding
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  • National Natural Science Foundation of China(51374212)
Appendix
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Year 2023 volume 40 Issue 4
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Article Info
doi: 10.3963/j.issn.1001-487X.2023.04.002
  • Receive Date：2022-11-15
  • Online Date：2026-03-19
  • Published：2023-12-01
Article Data
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History
  • Received：2022-11-15
Funding
National Natural Science Foundation of China(51374212)
Affiliations
    School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Beijing 100083, China

Corresponding:

XU Bo-wen (1998-), male, postgraduate, mainly engaged in research work in blasting engineering, (E-mail) .
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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