An analytical and computational study of combined rate and size effects on material properties.

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The recent interests 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 ... continued below

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32 p.

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Fang, Huei Eliot; Chen, Zhen (University of Missouri-Columbia, Columbia, MO); Shen, Luming () University of Missouri-Columbia, Columbia, MO) & Gan, Yong (University of Missouri-Columbia, Columbia, MO) May 1, 2005.

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Description

The recent interests 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 report to formulate a hyper-surface in both 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 hyper-surface, 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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32 p.

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  • Report No.: SAND2005-2021
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/923163 | External Link
  • Office of Scientific & Technical Information Report Number: 923163
  • Archival Resource Key: ark:/67531/metadc893259

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 1, 2005

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

Description Last Updated

  • Dec. 6, 2016, 6:59 p.m.

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Fang, Huei Eliot; Chen, Zhen (University of Missouri-Columbia, Columbia, MO); Shen, Luming () University of Missouri-Columbia, Columbia, MO) & Gan, Yong (University of Missouri-Columbia, Columbia, MO). An analytical and computational study of combined rate and size effects on material properties., report, May 1, 2005; United States. (digital.library.unt.edu/ark:/67531/metadc893259/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.