?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F275%2F&rft.title=Analysis+of+coil+slumping&rft.creator=Anderssen%2C+Bob&rft.creator=Fowkes%2C+Neville&rft.creator=Hickson%2C+Roslyn&rft.creator=McGuinness%2C+Mark&rft.subject=Materials&rft.description=Steel+strip+is+usually+stored+as+a+coil%2C+which+will+slump+to+some+degree+after+the+removal+of+the+mandrel.+More+often+than+not%2C+the+amount+of+slumping+is+so+minor+that+it+is+assumed+not+to+have+occurred.+Occasionally%2C+the+amount%2C+though+minor%2C+is+sufficient+to+compromise+the+integrity+of+the+cylindrical+bore+which+compromises+subsequent+handling+of+the+coil.+In+extreme+situations%2C+the+slumping+progresses+to+a+complete+collapse+of+the+coil.+Such+a+collapse+is+rare.+It+occurs+when+a+coil+cannot+hold+up+its+own+mass+and+loses+its+circular+cross-section.+It+is+thought+to+be+principally+associated+with+the+size+and+weight+of+the+coil%2C+inappropriate+coiling+tensions+and%2For+poor+re-coiler+equipment+design.+Strip+properties%2C+especially+inter-strip+contact+characteristics%2C+have+been+demonstrated+experimentally+to+be+crucial+determinants+of+whether+or+not+coil+collapse+is+likely+to+occur.%0D%0A%0D%0AThe+particular+kind+of+slumping%2Fcollapse+of+interest+to+BlueScope+Steel%2C+who+proposed+this+Study+Group+problem%2C+is+the+minor+slumping+that+compromises+cylindrical+bore+integrity.+It+is+referred+to+as+coil+slump.+%0D%0A%0D%0AThe+Study+Group+was+asked+to+investigate+and+model+the+phenomenon+of+coil+slumping%2C+and%2C+if+possible%2C+to+quantify+the+effect+of+critical+parameters%2C+especially+coil+mass%2C+strip+thickness+and+inter-strip+friction.+In+particular%2C+it+was+suggested+that+deliberations+should+aim+to+characterize+the+geometry+of+slumping+and+to+predict+the+deformation+profile+at+the+innermost+and+outermost+wraps.%0D%0A%0D%0AFor+BlueScope+Steel%2C+the+long+term+objectives+are%3A%0D%0A(1)+the+formulation+of+the+governing+equations+for+the+stresses+in+a+coil+under+self-weight%2C%0D%0A(2)+the+identification+of+analytical+solutions+and%2For+numerical+schemes+for+the+final+coil+shape+after+slumping%2C+and%0D%0A(3)+the+formulation+of+exclusion+rules-of-thumb+which+predict+when+a+particular+form+of+slump+(oval+or+triangular)+is+likely+to+occur.%0D%0A%0D%0AThe+Study+Group+made+some+progress+with+(1)%2C+limited+progress+with+(2)+and+most+progress+with+(3).+Though+various+computer+programs+were+written+to+explore+different+force+and+energy+balance+scenarios%2C+they+only+scratched+the+surface+with+regards+to+(2).+Success+with+it+is+heavily+dependent+in+substantial+progress+being+made+with+(1).+As+explained+in+detail+in+the+sequel%2C+the+Study+Group%E2%80%99s+deliberations+resulted+in+an+improved+understanding+of+the+coil+slumping%2Fcollapse+problem+by+identifying+a+number+of+specific+issues+that+should+be+of+direct+assistance+to+BlueScope+Steel%E2%80%99s+future+management+of+coil+slumping%2Fcollapse.%0D%0A%0D%0AIn+particular%2C+such+issues+included+the+need%2C+from+a+modelling+perspective%2C+to+draw+a+clear+distinction+between+minor+slumping+and+major+slumping+which+can+subsequently+lead+to+collapse%3B+the+formulation+of+a+heuristic+hypothesis+about+the+dynamics+of+coil+slumping%2Fcollapse+which+can+be+compared+with+historical+data+and+act+act+as+a+conceptualization+guide+for+further+investigations%3B+the+identification+of+a+%E2%80%9Ctension-weight+ratio%E2%80%9D+(R)+as+the+relevant+dimensionless+group+which+represents+an+indicative+rule-of-thumb+which+can+be+applied+in+practice%3B+and+proposed%2C+on+the+basis+of+the+hypothesis%2C+an+efficient+procedure+for+recording+collapse+events+and+statistically+identifying+possible+collapse+situations.&rft.date=2009&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F275%2F1%2Fbluescope2misg2009.pdf&rft.identifier=++Anderssen%2C+Bob+and+Fowkes%2C+Neville+and+Hickson%2C+Roslyn+and+McGuinness%2C+Mark++(2009)+Analysis+of+coil+slumping.++%5BStudy+Group+Report%5D+++++