International Journal for Multiscale Computational Engineering

ISSN for PRINT: 1543-1649

For Online Access

Best Paper Award Selection - Editorial Board Site

2005, Volume3

Zhen Chen
Department of Civil & Environmental Engineering, University of Missouri, USA

Luming Shen
University of Sydney

Yong Gan
Department of Civil and Environmental Engineering, University of Missouri-Columbia, USA

H. Eliot Fang
Sandia National Laboratories

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.

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

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