资源描述：
《从泰坦尼克号的沉没到世贸大楼的倒塌（from the sinking of the titanic to the collapse of the world trade center）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、从泰坦尼克号的沉没到世贸大楼的倒塌（FromthesinkingoftheTitanictothecollapseoftheWorldTradeCenter）Yourcompetitiontopicis"fracturefailureofmetalalloymaterial"".IheardthatyouaddedthecauseofthesinkingoftheTitaniclinerasanexampleThebrandof.ThisisanexampleIreadinanEnglishtextboo
2、k,whichwasjustaquestionforafter-schoolthinking.IthinktheTitanicincidentisveryfamiliartoeveryone.Ifyoulookatthefamiliarexamplesfromthematerialperspective,thestudentswillfeelnew.Improvingthefractureisoneofthemostdangerousfailureofengineeringcomponents,espec
3、iallythebrittlefracture,itisasuddenfailure,noobvioussignsoffracture,whichoftencausedcatastrophicdamageaccidents.Beforetalkingaboutthebasicconceptof"break",IfirstputafilmfragmentofTitanicsinking.Titanic,everybodyisveryfamiliarwith,itwasthelargestandmostlux
4、uriouscruiseship,drainagecapacityof4600tons,thereisthenameofthemaritimecapital.Butitissucha"unsinkable"luxurypassengership,afteracollisionwiththeiceberg,itwillproducemorethan90meterslongcracks,just3hourssank.Thisisanunsolvedmysteryinthepast100years.Scient
5、istsbelievethattheaccidentiscloselyrelatedtothematerial,basedontheanalysisoftheship'swreckageremovedfromthebottomofthesea.Materialsprofessionalstudentsheardhereimmediatelypale.WhichwasthenIsaid,theTitanichitanicebergandsank,theshipisnotwater,butafterhitti
6、nganiceberg,thefrontisbroken,thefronthalfofwater,causingtheshiperectedthisshipslammingoff!Yousee,thisisbrittle,justlikeglass.ButthesteelofNo.20isgenerallyductile!Whyisitbrittle?Improvingthestudentsareanxioustoknowthesecret.APbutIstop,don'tworry,wefirstana
7、lyzethebasicconceptof"fault".Thisistheteachertheyteach"foreshadowing","suspense".Thisislikethestudentstotreasurebeforethedoor,pushingthestudentstoseethebabytreasurehousewasasuperbcollectionofbeautifulthings,eager,eagertotreasure.Atthistime,thestudentsthir
8、stforknowledgeisthemostintense.Becausethesuspensegrippedthecuriosityofthestudents.Whichwasfinallyintheclassroom,weuncoverthemysterysuspense,letthestudentsopenthetreasurewith:undercertainconditions,thenatureofthemate
