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- W1607032271 abstract "Two-dimensional thermal models from automated tape placement (ATP) of thermoplastic composites neglect the diffusive heat transport that occurs between the newly placed tape and the cool substrate beside it. Such lateral transport can cool the tape edges prematurely and weaken the bond. The three-dimensional, steady state, thermal transport equation is solved by the Green''s function method for a tape of finite width being placed in an infinitely wide substrate. The isotherm for the glass transition temperature on the weld interface is used to determine the distance inward from the tape edge that is prematurely cooled, called the cooling incursion delta a. For the Langely ATP robot, delta a = 0.4 mm for a unidirectional lay-up of PEEK/carbon fiber composite, and delta a = 1.2 mm for an isotropic lay-up. A formula for delta a is developed and applied to a wide range of operating conditions. A surprise finding is that delta a need not decrease as the Peclet number Pe becomes very large, where Pe is the dimensionless ratio of inertial to diffusive heat transport. Conformable rollers that increase the consolidation length would also increase delta a, unless other changes are made, such as proportionally increasing the material speed. To compensate for premature edge cooling, the thermal input could be extended past the tape edges by the amount delta a. The method should help achieve uniform weld strength and crystallinity across the width of the tape." @default.
- W1607032271 created "2016-06-24" @default.
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- W1607032271 date "2000-05-25" @default.
- W1607032271 modified "2023-09-23" @default.
- W1607032271 title "Thermal Edge-Effects Model for Automated Tape Placement of Thermoplastic Composites" @default.
- W1607032271 hasPublicationYear "2000" @default.
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