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SUMMARY:Folding tape springs and “tapered” springs - Jamie Clarkson
DTSTART:20231124T150000Z
DTEND:20231124T160000Z
UID:TALK208600@talks.cam.ac.uk
CONTACT:Jamie Clarkson
DESCRIPTION:Tape springs are transversely curved thin strips\, of which a 
 carpenter’s tape measure is a familiar example. They are widely used as 
 deployable structures in aerospace applications. One key desirable propert
 y is the ability to form elastic folds\, where\, upon bending\, the cross 
 section flattens into a developable surface and large rotations can be app
 lied to the tape spring at a low\, constant\, moment. This allows tape spr
 ings to be packaged by folding up with hinges at various locations\, or by
  coiling the whole spring up on a drum. Predicting the fold radius and mom
 ent is of considerable importance for design. Early work by Rimrott predic
 ts a fold radius equal to the transverse radius of the spring\, which is a
 pproximately true. An improved prediction was recently introduced by Calla
 dine & Seffen. This talk will discuss tape spring folding as a two-phase e
 nergy minimisation problem\, solved by the Maxwell “equal area” condit
 ion\, and show how previous solutions are approximations to this condition
 . The approach is then extended to “tapered” springs where the transve
 rse radius and/or width can vary linearly along the length of the spring\,
  which form spiralling folds that may avoid some practical problems with p
 ackaging tape springs for deployment. Finally\, arbitrary variations of cr
 oss section along the length will be considered.\n\n\n\n\nJoin Zoom Meetin
 g\n\nhttps://cam-ac-uk.zoom.us/j/89120663558?pwd=UTRMNnZPbDVGdWVXWU41S3NCa
 WFrUT09 \n\nMeeting ID: 891 2066 3558\nPasscode: 645190\n
LOCATION:CivEng Seminar Room (1-33) (Civil Engineering Building)
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