Structural Qualification of Composite Propeller Blades Fabricated by the Resin Transfer Molding Process / SL. Smith, JL. Mattavi
- Conference Author
- Composite Structures: Theory and Practice (1999 : Seattle, Washington)
- Physical Description
- 1 online resource (19 pages) : illustrations, figures, tables
- Additional Creators
- Smith, SL., Mattavi, JL., American Society for Testing and Materials, and ASTM International
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License restrictions may limit access. - Summary
- The unique challenges for developing design allowables for a resin transfer molded propeller blade are discussed. Preliminary allowables were determined based on coupon tests for the initial blade design. Nonstandard specimen geometries were investigated in order to provide valid failure modes and associated strength values for the spar, shell and adhesive bond joint in terms of static and fatigue strengths out to 108 cycles. Full-size blade component tests were performed to verify or substantiate the preliminary allowables. Analyses of failure modes on the full-size specimens directed the structural qualification process. This included follow-up coupon fatigue tests and expansion of the fullsize test matrix. The general conclusions are that coupon tests are necessary for determining elastic constants and for effects of batch variation, environment, and for shape of fatigue curves, but generally do not provide enough guidance to design a resin transfer molded (RTM) structure without some full-size test experience. This is due to the absence of edge, surface and width effects found in coupons and the inclusion of thermal, manufacturing and geometry effects found in the full-size specimens. These and other scale effect issues therefore dictate the need to test full-size specimens early on in the normal building block approach. The number of full-size tests is generally higher for an RTM blade or structure than for a metal blade or for a standard prepreg, thin composite structure, since statistical treatment of the full-size fatigue data is necessary for establishing final design allowables. This top-of-the-pyramid approach to structural qualification can make RTM unique from prepreg or metal structures.
- Dates of Publication and/or Sequential Designation
- Volume 2001, Issue 1383 (January 2001)
- Subject(s)
- Other Subject(s)
- ISBN
- 9780803154490 (e-ISBN)
9780803128620
0803128622 - Digital File Characteristics
- text file PDF
- Bibliography Note
- Includes bibliographical references 16.
- Other Forms
- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Also available in PDF edition. - Reproduction Note
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2001. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details
- Mode of access: World Wide Web.
- Source of Acquisition
- ASTM International PDF Purchase price USD25.
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