th  On August 13, 2014, the U.S. Department of Energy (DOE) formally announced two grants for hydrogen storage technology development; WireTough Cylinders LLC of Bristol, Virginia was selected by DOE as the primary investigator for a $2 million project to build low cost, high pressure hydrogen storage vessels using its patent pending steel wire over-wrap process. The second project for hydrogen storage was awarded to the Oak Ridge National Laboratory, which incorporated WireTough’s technology into its proposal. These two projects were part of the Energy Department’s $20 million dollar grant program designed to find companies to research and develop affordable, efficient fuel cell and hydrogen technologies.

N&R Engineering assisted WireTough with its design and analysis for this project. N&R provided a finite element stress analysis of these steel wire over-wrapped pressure vessels. In addition to utilizing non-liner elastic-plastic material definitions, various manufacturing processes such as autofrettage and wire pretension were included in the analysis.

Services Provided:

  • Finite Element Stress Analysis
  • Elastic-Plastic Material Definitions
  • Analysis includes:
    • Autofrettage
    • Wire Pretension
    • Cyclic Fatigue
    • Crack Growth


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