Paper number 342


Troy E. Meink1, H-M Herman Shen2, Steven M. Huybrechts1

1Structural Systems Branch, USAF Research Lab
Kirtland AFB, New Mexico, 87117-5776
2Department of Aerospace Engineering, The Ohio State University
Rm 328 Bolz Hall, 2036 Neil Ave, Columbus, OH 43210-1276

Summary Cure consolidation is the primary cause of warpage in filament wound closed-section parts. The amount of consolidation that occurs is dependent on various manufacturing parameters including: winding tension, material system, cure profiles, and tooling stability. A methodology has been developed to predict and reduce the warpage based on the magnitude and profile of the consolidation [1]. To allow for use of this theory in commercial manufacturing environments the consolidation must be better characterized. The dominant manufacturing parameter is winding tension, which effects the final consolidation in two ways. The first being the winding lay-down thickness and the second being the Effective Cure Pressure. This paper investigates the latter effect. It will be shown from theoretical derivations and testing, that the winding tension does affect the level of consolidation and causes a non-linear strain profile through the laminate thickness.
Keywords cure consolidation, filament winding, fiber placement, manufacturing, warpage, spring-back.

Theme : Processing, Integrated Design and Manufacturing

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