Deformation parameters influencing prepreg tack
- Univ. of Washington, Seattle (United States)
- Boeing Commercial Airplanes, Seattle, WA (United States)
A compression to tension apparatus and a methodology capable of measuring prepreg tack have been analyzed in detail in order to establish fundamental material and operating characteristics. Both intrinsic and extrinsic parameters influencing prepreg tack were identified and analyzed using commercially available carbon fiber/epoxy prepregs and mechanical testing equipment. Two different factors, (1) contact (or wetting) area of adjacent prepreg plies and (2) viscoelastic properties of the prepreg, were found to control prepreg tack. At low temperatures, contact area was the main deformation controlling step, while at high temperatures, the viscoelastic property of the prepreg was found to be dominant. Both interlaminar and intralaminar deformations were observed depending on the prepreg systems examined as well as the operating conditions of the test. In addition, hold time, hold pressure, loading rate, resin content, and out-time were also found to affect prepreg tack. Energy of separation, which may be viewed as a descriptor of prepreg tack, was observed to increase with increasing hold time, hold pressure, and loading rate. Energy of separation also showed a maximum value at a specific resin content for a specific prepreg system, while it decreased with increasing prepreg out-time due to prepreg surface characteristic change rather than bulk physical aging. Conclusively, it was observed that prepreg tack must be viewed as an extrinsic, bulk, but surface-sensitive, viscoelastic property which depends on material as well as operating conditions.
- OSTI ID:
- 5275885
- Journal Information:
- SAMPE Quarterly (Society of Aerospace Material and Process Engineers); (United States), Vol. 23:2; ISSN 0036-0821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMPOSITE MATERIALS
DEFORMATION
ADHESIVES
ANISOTROPY
CARBON FIBERS
COMPRESSION
DENSITY
ELASTICITY
EPOXIDES
EXPERIMENTAL DATA
LAYERS
MEASURING METHODS
OPTICAL MICROSCOPY
PARAMETRIC ANALYSIS
RESINS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
VISCOSITY
WETTABILITY
DATA
FIBERS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHYSICAL PROPERTIES
POLYMERS
TENSILE PROPERTIES
360603* - Materials- Properties