- Chapter 6 Buckling and Indents

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1、CracksBucklingIndent失稳BucklingCorrosion如何保证这种情况不再发生？Howdowemakesurethisdoesnothappen?CracksBucklingIndent失稳模式Corrosion（DNV规范）Bucklingmodes(DNVRules)失稳模式由结构形式和载荷情况决定Bucklingmodesdependongeometricalproportionsandloading:不同的失稳模式:Differentbucklingmodes:•剪切失稳Shearbuckling•板失稳-单轴Platebuckling-

2、uniaxial•双向板失稳Bi-axialplatebuckling•扶强材失稳BucklingofstiffenerCracksBuckling剪切失稳IndentShearbucklingCorrosion剪切失稳Shearbuckling-板材太薄-纵骨太强Weak/thinplate-strongstiffeners:剪切力ShearforcesCracksBucklingIndent剪ᑨ࡯䖛载ᓩ发的失稳CorrosionBucklingduetoexcessiveshearstress:由Ѣぎ㠅和⍋∈य़࡯Ꮒᓩ发的剪࡯Shearforcesduetoseaᬷ䋻

3、㠍双ሖᑩpressureemptyhold的ᅲ㙟板DoublebottomfloorBulkCarrier形ব切剪剪ᑨ࡯䖛载ᓩ发的失稳Bucklingduetoexcessiveshearstress:≑䔺䖤䕧㠍㠍㠝㙟板ᡓফ⍋∈ᢡᠧय़࡯Floorintheaftshipofacarcarriersubjectedtoslammingpressure:催剪切ᑨ࡯Highshearstress:剪ᑨ࡯䖛载ᓩ发的失稳Bucklingduetoexcessiveshearstress:CracksBucklingIndent剪ᑨ࡯䖛载ᓩ发的失稳CorrosionBuckling

4、duetoexcessiveshearstress:ῑൟ῾㠅ຕTransversecorrugatedbulkheadSheardeformationCracksBucklingIndent单向板失稳CorrosionUnilateralplatebucklingᑇ䴶ᑨ࡯Inplanestresses板८/扶强材䯈䎱ᰃ失稳强ᑺ的݇䬂platethickness/stiffenerspacingiscriticalforbucklingstrength单向板失稳Uniaxial-Platebuckling–WaveBreakerCracksBucklingIndent双向

5、板失稳CorrosionBi-axialplatebucklingCracks᳝扶强材的板ᶊ失稳形式BucklingIndentBucklingmodesinstiffenedpanelsCorrosionPULSbucklingcode1.纵骨П䯈的板失稳Platebucklingbetweenstiffeners-薄板-强纵骨Weak/thinplate-strongstiffenerCracksBuckling᳝扶强材的板ᶊ失稳形式IndentCorrosionBucklingmodesinstiffenedpanelsCracksBucklingᡁ᳆失稳形式In

6、dentTorsionalbucklingmodeCorrosion2.ᡁ᳆失稳形式Torsionalbucklingmode-ᔅ扶๭材（催㝍板+ᇣ䴶板）Weakstiffener-highstiffenerwithsmallflangeandthinwebCracksBucklingIndentᡁ᳆失稳形式TorsionalbucklingmodeCorrosion•扶๭材೼῾向≵᳝䎇໳的稳ᗻˈᇚᡁ᳆Thestiffenerdoesnothavesufficientstabilityintransversedirectionandwilltwistout•ϟ䴶খ᭄ᕅડ

7、ᡁ᳆失稳强ᑺThefollowingdimensionsaffectthetorsionbucklingstrength;–䴶板ሎᇌThedimensionoftheflange–㝍板催ᑺ/८ᑺHeight/thicknessofwebplate–板的८ᑺ/ᆑᑺThicknessandwidthofthesupportingplate•催㝍板和ᇣ䴶板的㠍ᑩ纵骨的ᆍᯧᡁ᳆失稳Forbottomlongswithhighwebsandrelativelysmallflanges,torsionbucklingmodehasshowncriti