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Home > Archive>Volume 52, Issue 6, 2023 >2031-2038. DOI:10.12442/j.issn.1002-185X.20220888
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An Improved Lemaitre Fracture Criterion and Its Application to Crack Prediction in Bending Forming
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Affiliation:

1.School of Materials Science and Engineering, Taiyuan University of Sciences and Technology, Taiyuan 030024, China;2.School of Intelligent Engineering, Jin Zhong College of Information, Jinzhong 030800, China

Fund Project:

Shanxi Province Patent Transformation Special Plan Project (202201006, 202202032); Shanxi Provincial Graduate Student Innovation Project (2021Y674); Taiyuan University of Science and Technology Postgraduate Joint Training Demonstration Base (JD2022002); Shanxi Province Key Research and Development Plan of Shanxi Province (202102150401002); Graduate Education Innovation Project of Taiyuan University of Science and Technology (BY2022004, SY2022007)

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    Abstract:

    In order to predict the crack defects in sheet metal bending, an Lemaitre criterion was improved to effectively predict the forming limit in bending while considering the stress triaxiality , the maximum principal stress ratio , and the influence of plastic strain on the damage. Taking 7075-T6 aluminum alloy as the research object, the crack forming in sheet bending was simulated to obtain the criterion parameter so as to determine the cracking threshold. Three point bending test and metallographic test were carried out on 7075-T6 aluminum alloy sheet with 6 mm in thickness. The accuracy of the criterion for crack prediction was verified by comparing the press measure of experimental, simulation and theoretical values. The results show that the improved Lemaitre fracture criterion is 9.7 mm, which is consistent with the results of simulation and experiment. Therefore the improved Lemaitre fracture criterion has a certain accuracy in predicting the crack of bending forming.

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[Gui Hailian, Zhang Chen, Liu Hao, Liu Jie, Tuo Leifeng, Chu Zhibing. An Improved Lemaitre Fracture Criterion and Its Application to Crack Prediction in Bending Forming[J]. Rare Metal Materials and Engineering,2023,52(6):2031~2038.]
DOI：10.12442/j. issn.1002-185X.20220888

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History
  • Received:November 10,2022
  • Revised:May 14,2023
  • Adopted:December 30,2022
  • Online: July 03,2023
  • Published: June 30,2023

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