Modeling of dynamic growth of a micro-scaled void based on strain gradient elasto-plasticity

• Autorzy: Ma Xinbing , Liu Jinxing , Wang Jiadong , Pan Hao

Identyfikatory

DOI

10.15632/jtam-pl/124993

• Języki publikacji: EN

Abstrakty

EN

Void initiation and growth serve as an important mechanism in ductile failures in metals. Particularly, on the micron-level, the extra hardening effect associated with strain gradient is accounted for by adopting strain gradient elasto-plasticity instead of the conventional plasticity. Effects of inertial, strain gradient hardening and thermal softening are formulated analytically for the case where a spherical void expands under external hydrostatic stress. As demonstrated by our results, the inertia effect firstly tends to hinder but then promotes the void growth. The threshold stress required for rapid void growth is lifted due to extra hardening of strain gradient so that the growth of a smaller void is delayed more remarkably. A considerable thermal softening phenomenon is observed here, which is caused by plastic work during the deformation process. The final void growth rate is mainly related to the maximum loading, which is consistent with the prediction based on the classical plastic theory.

Słowa kluczowe

EN

dynamic void growth; size effect; inertia; thermal softening

• Wydawca: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
• Czasopismo: Journal of Theoretical and Applied Mechanics
• Rocznik: 2020
• Tom: Vol. 58 nr 4
• Strony: 927--941
• Opis fizyczny: Bibliogr. 25 poz., rys., tab.

Twórcy

autor

Ma Xinbing

• Jiangsu University, Faculty of Civil Engineering and Mechanics, Zhenjiang, Jiangsu Province, China

autor

Liu Jinxing

• Jiangsu University, Faculty of Civil Engineering and Mechanics, Zhenjiang, Jiangsu Province, China
• Wuhan University of Science and Technology, The State Key Laboratory of Refractories and Metallurgy, Wuhan, Hubei Province

autor

Wang Jiadong

• Jiangsu University, Faculty of Civil Engineering and Mechanics, Zhenjiang, Jiangsu Province, China

autor

Pan Hao

• Institute of Applied Physics and Computational Mathematics, Beijing, China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).