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International Journal for Multiscale Computational Engineering
Impact-faktor: 1.016 5-jähriger Impact-Faktor: 1.194 SJR: 0.554 SNIP: 0.82 CiteScore™: 2

ISSN Druckformat: 1543-1649
ISSN Online: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v3.i4.40
pages 451-461

Hypersurface for the Combined Loading Rate and Specimen Size Effects on Material Properties

Zhen Chen
International Research Center for Computational Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116024, People's Republic of China; Department of Civil and Environmental Engineering, University of Missouri, Columbia, Missouri 65211, USA
Luming Shen
School of Civil Engineering, University of Sydney
Yong Gan
Department of Civil and Environmental Engineering, University of Missouri-Columbia, USA
H. Eliot Fang
Computational Materials Science & Engineering Department, Sandia National Laboratories, Albuquerque, NM 87185-1411, USA

ABSTRAKT

The recent interest in developing multiscale model-based simulation procedures have brought about the challenging tasks of bridging different spatial and temporal scales within a unified framework. However, the research focus has been on the scale effect in the spatial domain with the loading rate being assumed to be quasi static. Although material properties are rate dependent in nature, little has been done in understanding combined loading-rate and specimen-size effects on the material properties at different scales. In addition, the length and time scales that can be probed by the molecular-level simulations are still fairly limited due to the limitation of computational capability. Based on the experimental and computational capabilities available, therefore, an attempt is made in this paper to formulate a hypersurface in both the spatial and temporal domains to predict combined size and rate effects on the mechanical properties of engineering materials. To demonstrate the features of the proposed hypersurface, tungsten specimens of various sizes under various loading rates are considered, with a focus on the uniaxial loading path. The mechanical responses of tungsten specimens under other loading paths are also explored to better understand the size effect. It appears from the preliminary results that the proposed procedure might provide an effective means to bridge different spatial and temporal scales in a unified multiscale modeling framework, and facilitate the application of nanoscale research results to engineering practice.


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