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SUMMARY:Deformation of Coated Materials - Dr Jyhwen Wang\, Institute for M
 anufacturing
DTSTART:20081128T110000Z
DTEND:20081128T120000Z
UID:TALK15158@talks.cam.ac.uk
CONTACT:Roger Baker
DESCRIPTION:Deformable coated materials hold promises for various applicat
 ions such as polymer coated sheet metal for stamping and thin film coated 
 polymer for flexible electronics. The major challenges in forming coated m
 aterials into useful products are in keeping the coating form tooling cont
 act damage and in maintaining the adhesive bond in the deformation process
 . To develop successful processes and products\, it is critical to underst
 and the behavior of the coatings and substrates under plastic deformation.
 \n\nIn this talk\, two recent studies in coating adhesion during large def
 ormation are presented. To evaluate the performance of pre-coated sheet me
 tal in stamping\, a new testing methodology that combines the key attribut
 es of various experimental techniques is proposed. \n\nExperiments were co
 nducted and the results showed that the methodology can be successfully us
 ed to characterize the strength and weakness of two different types of PVD
 F coated materials. To analyze adhesion  loss\, the concept of adhesion po
 tential is proposed\, and the result in uniaxial deformation mode is prese
 nted.\n\nMotivated by the needs of improving corrosion resistance\, extrus
 ion of polymer coated metal rods was investigated in the second study. Ana
 lytical models based on upper bound method were developed to evaluate axis
 ymmetric conical die extrusion of pre-coated metals. The rigid plastic bou
 ndaries were optimized to obtain minimum extrusion power and to predict co
 ating failure. From the models\, the critical extrusion die angle can be d
 erived. The analytical results agreed well with the results from finite el
 ement simulation. The developed models can be used for extrusion die desig
 n and process analysis.\n
LOCATION:Seminar Room A at the Institute for Manufacturing\, Mill Lane
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