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Moisture Absorption of Composite Sandwich Structures

[+] Author Affiliations
Todd Coburn

California State Polytechnic University Pomona, Pomona, CAUS Technical, Fullerton, CA

Paper No. IMECE2014-39956, pp. V001T01A032; 11 pages
doi:10.1115/IMECE2014-39956
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 1: Advances in Aerospace Technology
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4642-1
  • Copyright © 2014 by ASME

abstract

It is widely understood that moisture can have a detrimental effect on the strength of composite structures. Traditional analysis often focuses on the effects to solid laminates or on the facesheets of composite sandwich structures. However, this focus is often not sufficient to ensure material strength and performance. It has been found that moisture effects on sandwich structures can also have a detrimental effect on secondary failure modes such as shear crimping and facesheet wrinkling, and that these effects can be significant, especially at temperature. A proper assessment of moisture effects on composite sandwich structures involves five key components: development of moisture diffusion constants, prediction of structural moisture levels, development of material allowables at predicted moisture levels, analysis of structure, and modification of the design, when warranted. This paper describes each component of this process, and introduces a simple algorithm to integrate the analysis.

Copyright © 2014 by ASME

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