Multiple parameter measurement of mixed-mode stress intensity factors using the photoelastic method

ZHAO Xi; JU Yang; ZHENG Ze-min

doi:10.13374/j.issn2095-9389.2017.08.020

Volume 39 Issue 8

Aug. 2017

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ZHAO Xi, JU Yang, ZHENG Ze-min. Multiple parameter measurement of mixed-mode stress intensity factors using the photoelastic method[J]. Chinese Journal of Engineering, 2017, 39(8): 1288-1294. doi: 10.13374/j.issn2095-9389.2017.08.020

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ZHAO Xi, JU Yang, ZHENG Ze-min. Multiple parameter measurement of mixed-mode stress intensity factors using the photoelastic method[J]. Chinese Journal of Engineering, 2017, 39(8): 1288-1294. doi: 10.13374/j.issn2095-9389.2017.08.020

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Multiple parameter measurement of mixed-mode stress intensity factors using the photoelastic method

doi: 10.13374/j.issn2095-9389.2017.08.020

ZHAO Xi^1,2,
JU Yang^{3,4
,
,},
ZHENG Ze-min¹

1) School of Mechanics & Civil Engineering, China University of Mining & Technology Beijing, Beijing 100083, China
2) Suzhou Electrical Apparatus Science Research Institute Co. Ltd., Suzhou 215104, China
3) State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology Beijing, Beijing 100083, China
4) State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China

Received Date: 2016-08-10

Abstract

Abstract

Precise calculation of the stress intensity factors at crack tips is of great significance in accurate analysis of a structure's crack initiation and fracture mode. In this research, a three-dimensional printing technique was adopted to manufacture a non-residual stress plate model, where high-precision printed pre-cracks avoid the occurrence of residual stress compared to traditional manufacturing processes. By comprehensively considering the singular and non-singular stresses at the near-crack-tip region, three constant stresses controlled by the far field were adopted. Multiple parameters of the photoelastic method combined with the least-squares method were applied to analyze the stress intensity factors of mode I and mixed modes in three-point bending tests under different loads, and a theoretical solution comparison was conducted. Results show that compared with the theoretical solution, the average calculation error for the mode I stress intensity factor is 6.1% and those for I-Ⅱ mixed modes are 6.4% and 5.5%, respectively. This slight calculation error verifies the reliability and accuracy of the multiple-parameter method and provides a reference for further precise calculations of the stress intensity factors using the photoelastic method.
- photoelastic method,
- three-dimensional printing,
- mixed-mode stress intensity factor,
- non-singular stress,
- least-squares method

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References(17)

References

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