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Experimental Mechanics

, Volume 59, Issue 7, pp 953–962 | Cite as

High-Temperature Fracture Mechanics Parameter Measurement and Yielding Zone Analysis of Superalloy GH4169 Based on Single-Lens 3D Digital Image Correlation

  • Y. Yin
  • L. Wu
  • J. Li
  • H. XieEmail author
Article

Abstract

Fracture mechanics parameters are crucial for evaluating the failure of a material; furthermore, the yielding zone near the crack tip is closely related to the ultimate bearing capacity. How to characterize these parameters has drawn a lot of attention from mechanics researchers. Currently, the digital image correlation (DIC) method, due to its advantage of being able to perform full-field, non-contact measurements, has great potential for application in the measurement of the mentioned parameters. In this paper, a bi-prism-based single lens (BSL) 3D DIC technique was utilized to determine the fracture mechanics parameters and the yielding zone size of the Ni-based superalloy GH4169 at room temperature and 650 °C. In the measurement, the displacement fields of single-edge cracked specimens under a uniaxial tensile load were measured using the BSL 3D DIC system. And then, the J integral and stress intensity factor K at room and high temperature were calculated from the displacement fields. Finally, the J integral calculated using the path integral method (J _ 1) and the J integral converted from the stress intensity factor K (J _ 2) were used to evaluate the yielding condition near the crack tip Yoneyama et al. (Strain 50(2):147–160, 2014), while a specific value was also determined as the critical small-scale yielding load from the variations of J _ 1 and J _ 2. Additionally, the relationship between the yielding zone size rp, calculated from K and the value ∆J = J _ 2 − J _ 1 was established, which was found to be linear. On the rp − ∆J curve, the intercept on the rp axis could be regarded as the critical size of small-scale yielding zone.

Keywords

Single-lens 3D digital image correlation J integral Stress intensity factor Yielding zone 

Notes

Acknowledgements

This research as financially supported the National Natural Science Foundation of China (Grant Nos. 11672153, 11232008).

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Copyright information

© Society for Experimental Mechanics 2019

Authors and Affiliations

  1. 1.AML, School of Aerospace EngineeringTsinghua UniversityBeijingChina
  2. 2.Beijing Institute of Astronautical Systems EngineeringBeijingChina

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