Journal
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 34, Issue 3, Pages 1049-1058Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-020-0207-3
Keywords
Al6061-T6; Notch effect; Notch strengthening; Digital image correlation (DIC); Finite element method (FEM); Strain distribution; Stress triaxiality
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Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A2C1002193]
- National Research Foundation of Korea [2019R1A2C1002193] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The fracture of ductile materials such as Al6061-T6 usually starts from void nucleation. In this study, we investigated strengthening effect and stress triaxiality behavior in notched Al alloy specimens. Various specimens, one un-notched and two with different U-types of notch, one with large diameter (L-notched) and another with small diameter (S-notched), having the same width were selected. The distribution of strain in the full-field was examined using the digital image correlation (DIC) method. Under the tensile test, S-notched specimens showed a more pronounced strengthening effect than the L-notched specimens. The results of DIC confirmed that the notch tip of the S-notched specimen experienced high strain, while the L-notched specimen experienced high strain at the center. The maximum stress triaxiality moved rapidly from the notch tip to the center with the increase in notch radius over 10 mm. The results of the stress triaxiality analysis by finite element method were in good agreement with the above DIC measurement results and predicted the void generation and fracture sites in L-notched and S-notched specimens.
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