Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub

    Description

    As wind energy production drives the manufacturing of wind turbine blades, the utilization of glass and carbon fiber composites as a material of choice continuously increases. Consequently, the needs for accurate structural design and material qualification and certification as well as the needs for aging predictions further underline the need for accurate constitutive characterization of composites. In the present paper we describe an outline of a recently developed methodology that utilizes mutliaxial robotically controlled testing combined with design optimization for the automated constitutive characterization of composite materials for both the linear and non-linear regimes. Our approach is based on the generation of experimental data originating from custom-developed mechatronic material testing systems that can expose specimens to multidimensional loading paths and can automate the acquisition of data representing the excitation and response behavior of the specimens involved. Material characterization is achieved by minimizing the difference between experimentally measured and analytically computed system responses as described by strain fields and surface strain energy densities. Small and finite strain formulations based on strain energy density decompositions are developed and utilized for determining the constitutive behavior of composite materials. Examples based on actual data demonstrate the successful application of design optimization for constitutive characterization. Validation experiments and their comparisons to theoretical predictions demonstrate the power of this approach.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Michopoulos, John; Iliopoulos, Athanasios; Hermanson, John. 2012. Robotic and Multiaxial Testing for the Determination of the Constitutive Characterization of Composites. Michopoulos, J., Iliopoulos, A. and Hermanson, J. (2012) Robotic and Multiaxial Testing for the Determination of the Constitutive Characterization of Composites, In: Materials Challenges in Alternative and Renewable Energy II: Ceramic Transactions (eds G. Wicks, J. Simon, R. Zidan, R. Brigmon, G. Fischman, S. Arepalli, A. Norris and M. McCluer), John Wiley & Sons, Inc., Hoboken, NJ, USA. 14 p.

    Keywords

    hexapod, 6 degree-of-freedom, mechatronics, data-driven methodology, automation

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/49492