Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 195, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2021.104573
Keywords
Indentation; Biaxial stress; Energy method; Knoop indenter
Funding
- National Natural Science Foundation of China [51805546]
- Natural Science Foundation of Shandong Province [ZR2019BEE050]
- Fundamental Research Funds for the Central Universities [(20CX06060 A)]
- China Postdoctoral Science Foundation [2020M672167]
- Qingdao Postdoctoral Applied Research Project [qd20200003]
- Graduate Student Innovation Project, China University of Petroleum (East China) [YCX2020089]
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An energy difference method is proposed to estimate biaxial stress components based on indentation technique. This method can transform a biaxial stress state into two equivalent uniaxial stress states by measuring the difference in indentation energy. A portable indentation instrument was developed for on-site measurements.
In this paper, an energy difference method is proposed to estimate biaxial stress components based on inden-tation technique. The indentation energy is chosen as an analytical parameter, which can be calculated directly from the load-depth curve. The presence of residual stress in a material causes the change of indentation energy. The mapping relationship between uniaxial stress and indentation energy difference was established by finite element analysis. Meanwhile, the Knoop tip was applied since the indentation response varies according to the indenter orientation. Using this feature, a biaxial stress state can be transformed into two equivalent uniaxial stress states by indentation energy conversion. Finally, the biaxial residual stress components can be solved by the energy difference functions of two orthogonal indentations. A portable indentation instrument was developed to implement this approach, which is suitable for in-site measurement. The obtained results show good agree-ments with the artificial stresses applied by cross-shape sample experiment.
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