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Co-bonded composite joints using Z-fiber(trademark) stubble
Z-pins are small diameter carbon rods that are ultrasonically inserted through composite laminates in the z-direction to provide extra resistance to crack growth and delaminatiom. Titey are normally inserted through co-cured composites, but this paper presents an experimental study on a new z-pin stubbie manufacturing technique that is compatible with the co-bonding process. Z-pin stubble is created by inserting pins through the thickness of an uncured laminate and trimming the pins to a certain height above the surface. After cure, an uncured composite part is cured on the exposed stubble. Early researchers were limited to an exposed stubble height of 0.030 inch, which would not provide all of the benefits of a full-depth co-cured z-pin reinforced joint. Past studies have successfully increased the useful stubble reinforcement to 0.080 inch which was shown to have significant advantages. This paper describes the most recent attempt to create stubble fields with smaller diameter pins, increased aerial density, and increased height. Polyester peel plies and Teflon were stacked to define the height of the stubble fields. Several pins puled out of the composite during peel ply removal. Double cantilever beam (DCB) specimens were used to characterize the effect of stubble diameter and height on the Mode I crack resistance. In agreement with previous studies, the resistance to crack growth improved with increasing stubble density and height. Polyester and Teflon were also used in an attempt to make 0.125 and 0.250 inch long stubble. In this case, the majority of the pins pulled out of the composite during peel ply removal. These fabrication challenges were successfully overcome through a characterization of 21 different rubber materials. These materials possessed a wide range of mechanical and physical properties. Through this study, 2-pin stubble fields were successfully created with a height of 0.125 inch without losing any pins.
Co-bonded composite joints using Z-fiber(trademark) stubble
Z-pins are small diameter carbon rods that are ultrasonically inserted through composite laminates in the z-direction to provide extra resistance to crack growth and delaminatiom. Titey are normally inserted through co-cured composites, but this paper presents an experimental study on a new z-pin stubbie manufacturing technique that is compatible with the co-bonding process. Z-pin stubble is created by inserting pins through the thickness of an uncured laminate and trimming the pins to a certain height above the surface. After cure, an uncured composite part is cured on the exposed stubble. Early researchers were limited to an exposed stubble height of 0.030 inch, which would not provide all of the benefits of a full-depth co-cured z-pin reinforced joint. Past studies have successfully increased the useful stubble reinforcement to 0.080 inch which was shown to have significant advantages. This paper describes the most recent attempt to create stubble fields with smaller diameter pins, increased aerial density, and increased height. Polyester peel plies and Teflon were stacked to define the height of the stubble fields. Several pins puled out of the composite during peel ply removal. Double cantilever beam (DCB) specimens were used to characterize the effect of stubble diameter and height on the Mode I crack resistance. In agreement with previous studies, the resistance to crack growth improved with increasing stubble density and height. Polyester and Teflon were also used in an attempt to make 0.125 and 0.250 inch long stubble. In this case, the majority of the pins pulled out of the composite during peel ply removal. These fabrication challenges were successfully overcome through a characterization of 21 different rubber materials. These materials possessed a wide range of mechanical and physical properties. Through this study, 2-pin stubble fields were successfully created with a height of 0.125 inch without losing any pins.
Co-bonded composite joints using Z-fiber(trademark) stubble
Clay, Stephen B. (Autor:in) / Pommer, Amanda K. (Autor:in)
2006
11 Seiten, 9 Quellen
Aufsatz (Konferenz)
Englisch
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