Flow stress modelling in large strain region during non-monotonic loading for new guideline to improve formability

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03785
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 18020:Manufacturing and production engineering-related
• Research Institution: Tohoku University
• Principal Investigator: Ueshima Nobufumi 東北大学, 工学研究科, 助教 (10733131)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 流動応力 / 非単調負荷

Outline of Final Research Achievements

The influence of the non-monotonic loading on the flow stress of aluminum has been investigated by compression testing. We found that there are no detectable difference between monotonic and non-monotonic loading. Next, channel die compression has been carried out to compress the specimen uniformly and with keeping stress state unchanged. We found that the strain larger than 1 cannot be achieved by small die due to friction and burrs. On the contrary, the strain larger than 1 has been achieved by large die. These achievement enabled us to investigate flow stress during non-monotonic loading at large strain region.

Free Research Field

塑性加工学

Academic Significance and Societal Importance of the Research Achievements

引張では見られた流動応力の負荷方法依存性が円柱圧縮では見られなかったことから、通常のすえ込みでは、応力緩和による影響は考えなくてよいことが明らかとなった点が、学術的に意義があると考える。また、応力状態を保ったまま高ひずみ域まで流動応力を取得できる方法を開発した点は、社会的に意義があると考える。