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日時 | 2025.2.14(15:30~16:45) |
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会場 |
東京農工大学 小金井キャンパス 13号館 4階 講義室 L1341 ミーティングID:842 2865 5225 パスコード:025207 |
講演者 | Dr. Frédéric Barlat |
所属機関 | 浦項工科大学 / University of South Brittany (韓国 / フランス ) |
講演タイトル | "DISTORTIONAL PLASTICITY AND CONTINUUM THERMODYNAMICS" <要旨> A concise review of recent distortional plasticity models is provided in this presentation. Such models are efficient for the description of the plastic behavior of metals subjected to strain path changes. These changes are common during the forming operations of complex parts and must be accounted for in numerical simulations. This review underlines that the yield surface evolution can be described effectively with distortional plasticity. However, this comes at the expense of a number of state variables with their evolution equations. Compared with isotropic hardening, distortional plasticity models are more difficult to apply in practical problems. One of the main impediment comes from the complex optimization tools required for the identification of the model coefficients. However, one of such models, HEXAH, was designed to simplify this identification procedure. In fact, applications of HEXAH to advanced high strength steels, TRIP and DP, are given for illustration purpose in this presentation. It is shown that the determination of the model coefficients does not require complex optimization tools but just an old fashion trial-and-error method. Then, the classical continuum thermodynamics concepts applied to the constitutive models of plasticity are briefly discussed and illustrated with a simple example. It is shown that, within the framework of classical thermodynamics, it is very difficult to develop distortional plasticity models that lead to an accurate description of the material behavior. For this reason, a recently proposed unconventional thermodynamics approach that circumvent the drawbacks of the conventional approach is described in this presentation. It is shown that, if carefully developed, distortional plasticity models such as HEXAH provide an accurate description of the material behavior and are consistent with the requirement of thermodynamics. |
言語 | 英語 |
対象 | どなたでも、ご参加いただけます。 |
主催 | グローバルイノベーション研究院 エネルギー分野 ポンサトーン・ラクシンチャラーンサクチーム 卓越大学院プログラム |
お問い合わせ窓口 | グローバルイノベーション研究院・工学研究院 桑原 利彦 e-mail: kuwabara(ここに@ を入れてください)cc..tuat.ac.jp |
備考 | 本セミナーは、オンライン・対面型の同時開催となります。
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