[1] Yue Zhongwen, Han Ruijie, Zhang Wang, Liu Wei, et al. Dynamic caustics experimental study on interaction betweenpropagating crack and deformity inclusions in primary structure [J]. Journal of Southeast University (English Edition), 2016, 32 (1): 73-77. [doi:10.3969/j.issn.1003-7985.2016.01.013]

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Dynamic caustics experimental study on interaction betweenpropagating crack and deformity inclusions in primary structure()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

32

Issue:

2016 1

Page:

73-77

Research Field:

Mathematics, Physics, Mechanics

Publishing date:

2016-03-20

Info

Title:

Dynamic caustics experimental study on interaction betweenpropagating crack and deformity inclusions in primary structure

Author(s):

Yue Zhongwen¹;  Han Ruijie¹;  Zhang Wang¹;  Liu Wei²

¹School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
²Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

Keywords:

dynamic caustics;  deformity inclusion;  dynamic stress intensity factor(DSIF);  crack propagation velocity

PACS:

O346.1

DOI:

10.3969/j.issn.1003-7985.2016.01.013

Abstract:

The approach combining the dynamic caustics method with high-speed photography technology is used to study the interaction between propagating cracks and three kinds of deformity inclusions(cylinder inclusion, quadruple inclusion and triangular inclusion)under low velocity impact loading. By recording the caustic spots of crack tips at different moments during the crack propagation, the variation regulations of dynamic stress intensity factors(DSIF)and crack growth velocity with respect to time are obtained. The experimental results show that the resistance effects to crack growth are varied with different shapes of inclusions in specimens, and the quadruple inclusion’s effect is more apparent. The distortion degree of caustic spots is affected by the shapes of inclusions as well, and the situation is more serious for cylinder and quadruple inclusions. The overall values of DSIFs of triangular inclusion specimen are greater than the others, and the crack growth velocities, characteristic sizes and DSIFs show processes of fluctuations because of the disturbance of reflection waves in specimens. The results provide an experimental basis for the analysis of strength and impact-resistance ability in structures with deformity inclusions.

References:

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Memo

Memo:

Biography: Yue Zhongwen(1975—), male, doctor, associate professor, zwyue75@163.com.
Foundation items: The National Natural Science Foundation of China(No.51374210, 51134025), the 111 Project(No.B14006).
Citation: Yue Zhongwen, Han Ruijie, Zhang Wang, et al. Dynamic caustics experimental study on interaction between propagating crack and deformity inclusions in primary structure[J].Journal of Southeast University(English Edition), 2016, 32(1):73-77. DOI:10.3969/j.issn.1003-7985.2016.01.013.

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