Student: Payden Coffman

Mentor: Craig Johnson


In collaboration with CWU students and faculty, improvements were made to the existing system that was intended to process scrap Boeing aircraft composite material. Current projects consist of changes to the design of the feed and crushing system, the system driving the crushing system, and the pyrolysis process. The previous feed and crushing system had a two step process that would feed and then delaminate the composite; the improved and redesigned system incorporates both these steps into a single process that both crushes and delaminates with a gear-like roller mechanism that will apply a load and then continually feed material through the system. Work so far has consisted of creating a shaft that sustain the high loads caused when the motor in the drive system is outputting its highest possible torque. From this, basic load and stress analysis was performed on the rest of the crushing mechanism and supporting chassis to ensure yielding and failure does not occur during testing. From the results found using Boeing’s composite material, the amount of material that could be processed was only about 0.8 ft/min, 0.2 ft/min less than what the system was designed for; these feeding issues appear to be due to slipping on the tooth surface as material passes through. In addition, there is about 20% less delamination in the layers when compared visually to the delaminated layers from composite fed through the previous design; this is likely due to lower radial loads or spacing between the applied loads from the crusher.


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