ssc-367 - Ship Structure Committee

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C.3.2(b) Smedley-HordsworthChord SCF’S for T-Joints The Smedley-Wordsworth chord SCF’S for T-joints are shown on the following pages. The following parameters are assumed for the Smedley-Wordsworthfigures: 1) = = 2L/D = 35.0 The Shell d/D limitations have not been imposed for the SCF calculation. C-14
— T-joint hid S5 Crm i%itim 1 1 1 i -= 120 : - = 15.0 ! ~= 20.0 j w=. a.o : 1 ;—l I 1 1 I t I : kh= ;Tw=l Ha 4/D ! b din : Ma*/o : h =dm I 1 I IWT : O*3!0.5: 0.710,9: 0,3! O,s: 0.7: 0.9: 0.3: 0.5: 0.7: 0.9: 0.3:0,5:0.7: 0.9; j—~— !— 1 — 1 —1—l—!—l —l—l—l—l—!—l—l—l—l—! 1 I O.a :2447‘3.OSI ‘Mu 3.2H3 :2.929 3*N13.1773.21E :3J693*14a3.l&l3.166:3,207 3*m 3.* 3.145 ! I :—; I ! : I : W.o fkj 0.54 W23 5.7W Lm b.(m ;5.365.7195,9075*W1;sm~g~,~ 5,7935,~:5,716 5m~ 5,~ 5,=; I 0.S?4rad:-1 I 1 t 1 : ! 0,25:8.15 9.361 %793 ?.~ k 140 %012 ?,ZJ1 9,015 ;8.276 E,W 8.891 R.= ;8.516 8.W7 8.7M MM ; { i— r I ~ I 1 f ! 1*Mh 13.5 14.49 13.71ill.% 13.(U 13,44 1275 :11.4E 12.46 12.57 11.Q h 1M6 12J5 ilma ; .... ..-, 1 1 i 0S 13.2U 3m&14.344 4.UO S294 3.W 4,320 4,7iZ :3.4~ 3.W 4,304 4.6W :3.E57 3.954 4,311 4.651: I I —i ! I 1 ! 1 M.O deq; 0,50 :5.74? 7.026 0.1~ 9.@ :5.06? 7,MI 7,% &EM ;kM4 7.(U3 7,905 MN k45 7.1~7,903 0,S1 ! I 1.047radi-! t 1 # 1 ) :0.75 :a.m10.M 12s27 13,52:s.643 10,47 11,95 13.10km 10.46 11,72 1273 k 10.57 11.66 i2.54 ; 1 1 ~—~ I i : : ! lm~ :11.57 14.63 16.M 1H,33;11.65 14.~ 16.Z 17.ti :11.94 ]4.14 15.83 17.03:12.32 14.19 15.65 16.71; 1 i 0.3 i3.E14 3AM 4.6UI 5.W !3.1S 3.W 4S47 5.1?6 13.240 3.BW 4,511 5.CQ7!3S43 3.741 4.549 5.046i 1 ;—{ t t 1 i i W.Odeqi O.~ !5.%9 7,X5 H.6W 10.02;5.6!II 7.15# E.= %779;5.M2 7,184 8.422 9,= ;b.03S 7.2K 9.397 9.443i I 1.571radl-! I ! i I I :0.75 :H.~ 10.81 13.ti 14.93;E.315 10,67 12.73 14,51:9.%4 10.64 12SI 14.13IH.E1410.71 12.41 13.93: I :—~ I I i i 1 : 1.M !!1.06 14.76 17.76 ZII,1O;11.14 14,45 17.22 !9.45 ;11.39 14.XI 16.7E 18.86:11.70 14,?3 MO 18.54!
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SSC-367 - FATIGUE TECHNOLOGY ASSESS
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SHIP STRUCTURF COMMllTFF The SHIP S
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—.--— 1. Report No. 2. Gowotnmr
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FATIGUE TECHNOLOGY Assessment AND D
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6. FATIGUE STRESS HISTORY MODELS 6,
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APPENDICES A. REVIEW OF OCEAN ENVIR
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D. VORTEX SHEDDING AVOIDANCE AND FA
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LIST OF FIGURES (cent.) FIGURE TITL
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HOT-SPOT STRESS . The hot-spot stre
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QA/Qc : Quality Assurance/QualityCo
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1. INTRODUCTION 1.1 BACKGROUND The
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general assessmentof fatiguewhile t
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2. OVERVIEW OF FATIGUE 2.1 FATIGUE
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2.2 FATIGUE ANALYSIS 2.2.1 Anal.vsi
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● Loads generated as affected by
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A deterministic method is sometimes
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1 APPLICATION OF NUMEROUS CYCLIC ST
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I MOBiLEANDSTATIONARY MARWE STRUCTU
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3. FATIGUE DESIGN AND ANALYSIS PARA
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and in-plane/out-of-planeangles,and
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the general quality of fabrication,
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3.2 REVIEW OF FATIGUE ANALYSIS PARA
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frequencies of interest, requiring
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● Reqular Waves in FrecjuencvDoma
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The finite element models of increa
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The stressmodel parametersdiscussed
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While API S-N curves are applicable
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DESIGN Osn40H rAnNsirsR8 FAMcA~ M P
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Primarily Affect .--------+’ & In
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MOTIONS MODEL — .—. ● ;LOADS
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loa 1 10 -— — — -t-i-nT 1[ -t
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4. GLOBAL REVIEW OF FATIGUE 4.1 APP
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An allowable stress method, also co
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esults of work covering assessment
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location. Thus, the method should b
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1. SDectral FaticlueAnalvsis Althou
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2. Weibull AtIDroach The Weibull sh
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energy about the central direction
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Although considered to be an emergi
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many design rules implement this ap
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Detailed Anal.vsisMethods The detai
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The DnV X-curve and the DEn Guidanc
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ending restrictions. Cruciform and
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period, are also designed tomeet th
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incorporates inspection-strategy(Re
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‘Thereare numerous finite element
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LOCATIONs oF FATIGUE CMCKS Figure 4
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TW=’T ——— ———___ __ r
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1 —. — — — — -.. - .. - .
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TOP[C U.K.DEPARTMENTOF ENERGY(OEn)
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:1 U.K.DEPARTMENTOF ENERGY(DEn) AME
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TOPIC U.K.DEPARTMENJOFEIWRGV(oEn) O
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5. FATIGUE STRESS MODELS 5.1 REVIEW
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● The water particle kinematicsar
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“radiation pressure” of waves,
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influence on the applied loading. H
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their function, selecting appropria
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hydrostatic stiffness is introduced
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structure is unique and an allowabl
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loads directly. Since the diffracti
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typically from 0.6 to 0.8 and 1.5 t
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therefore be defined uniformly alon
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load analysisof adetailed three-dim
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esponsesare required , or where con
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either multiple stick elements (for
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Braces may have stubs or cones, whi
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Whatever the basis for an empirical
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The SCF equations currently in use
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life. During the comprehensive desi
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?.s I z - ]LEvE~ ~ 1,5 \ i i+ 11 Is
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-. Figure 5-5 Comparison of Detaile
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( -t ) ( T-JOINT Y-JOINT ( \ I / K-
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SMEDLEY-WORDSWORTH 0 d =— = D 600
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Wave Records Older wave and wind in
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In many cases wind informationmay b
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q = 3.3 s = 0.07, for f< fm s = 0.0
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Seasonal Variation The annual wave
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4. ~arpkaya spreading. (Reference 6
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~. \“ life of a structure,cannot
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6.3 TIME-DOMAIN ANALYSES Nonlinear
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The wave environmentdefinitionsbase
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.,..,, ....- ., ;., .. .... .- .. .
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● Fatiguetest data should be care
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assessmentis typically identifiedas
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damage accumulation similar to that
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“FabricationRestrictions Fabricat
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Fatigue strength of a tubular joint
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Current recommendations,rules and s
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n NB=T 1 [p=+pi Ei . ‘c where: NB
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(2) Damage computation does not acc
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DNB = (f. T/K) (2/2 U)m r (f+ 1) wh
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interactionof multiple fatigue crac
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amplitude loading and loading seque
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n“ CAP PASSES ROOT = * { A A 4 I
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It should be pointed out that the e
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v= flow velocity normal to the cyli
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8.4 METHODS OF MINIMIZING VORTEX SH
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Ra < S REGIME OF UNSE?ARATE~ FLOW 5
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ages. The designer has no control o
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failure data on various structures,
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connections, knife edge crossings,
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9.3.1 Fabrication Effects The fatig
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● Controlled Erosion An alternate
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after a given number of stress cycl
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A second pass with polishingdisc is
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others. Extensive analytical and ex
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d) Stress SDectrum Hot-spot stresse
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Cumulativefatiguedamagecomputations
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as a parametric study intended to i
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Additional areas requiring further
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GROUP Modification of Weld Profile
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400 ‘,, . . 350 - I I 300r [ ~ ,0
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TOPIC SUBJECT INVESTIGATOR COMPLETI
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3.1 Soyak, J. F., Caldwell, J. W.,
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4.12 Daidola, J.C., and Basar, N.S.
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5.4 Papanikolaou,A. and Zaraphoniti
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5.21 -”’ ” ”---”---”
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“7.2 Jordan, C.R., and Cochran, C
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7.19 Niemi, E.J., “FatigueTests o
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9.1 Skaar, K.T., “ContributingFac
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COMMllTEE ON MARINE STRUCTURES Comm
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U.S.Department of Transportation Un
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Member Agencies: United States Coas
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‘ METRIC CONVERSION FACTORS Appro
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APPENDIX A REVIEW OF OCEAN ENVIRONM
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The most distinctive feature-of a r
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s(w) = 2*(4*112) - For a “height
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common probability distributions, t
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T: v. Visually Observed Period, or
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The characteristic wave heights of
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H~ is the significantwave height, a
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a = 0.09, for UJ>wm The U value of
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H~ is the significant height, ‘m
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If the wind duration is less than t
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Sample Wave scatter Diagram s 12 +.
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Nm is the total number of waves in
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turbulence largely a function of te
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Applied Wind Speed Vz(t) ft/s (m/s)
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A.1O REFERENCES A*I Mechanics of Wa
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APPENDIX B REVIEW OF LINEAR SYSTEM
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Awhite noise function-may be used t
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Multiplication of the wave spectrum
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B.2.2.2 Response Amplitude Operator
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0.2.3 Wave Spectra The wave spectru
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9 is the acceleration of gravity in
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The following is..a. sample...of..a
Page 295 and 296: is the damping ratio,..the ratio of
Page 297 and 298: the set of extreme conditions, and
Page 299 and 300: A response scatter diagram could be
Page 301 and 302: 2.4 2.2 2 1 ‘Sen &-”Swull$p~ctr
Page 303 and 304: L ‘2
Page 305 and 306: o Kuang (ReferenceCl) “ o Wordswo
Page 307 and 308: C.2 STRESS CONCENTRATION FACTOR EQU
Page 309 and 310: C.3 PARAMETRIC STUDY RESULTS . C.3.
Page 311: 30. 2s , 20. 15. 10. 5. & wORDSWORT
Page 314 and 315: ChordSide Brace Side K-Joints SCFU
Page 316 and 317: Definition of Parameters, Validitv
Page 318 and 319: -, l— I + ?1 -— I . 4> a ,- I I
Page 320 and 321: Kuang SCF Computdion 1 L u UI \ f-
Page 322 and 323: ., I , 1- out— FIano SCF m tg n I
Page 324 and 325: — 6 Smedley-Wordswoti SCF Computa
Page 326 and 327: T ln— Plan- SCF CrOwn POsltlon o
Page 328 and 329: C.3.l(C) Kuang Chord SCF’S for T-
Page 330 and 331: 5 Kuang SCF Computation 4 IL u M 3
Page 332 and 333: C.3.l(d) Smedley-WordsworthChord SC
Page 334 and 335: . ,i 5 Smedley-Wordsworth SCF Compu
Page 336 and 337: I I K Out— Plan= SCF —— Saddl
Page 338 and 339: - 10 Smedley-Wordsworth SCFComputat
Page 340 and 341: ‘\, ?v x out— Plan- SCF ——
Page 342 and 343: C.3.2(a) Kuang Chord SCF’S for T-
Page 344 and 345: KuwqSE _im T-joint In%neW UrrdSicko
Page 348 and 349: T-joint Axial SF Saddle Posiiim
Page 350 and 351: -— T-joint CtkuHlane ELFSaddlePci
Page 352 and 353: I 1 1 1 1 ~. l~o ~ ha= 1s0 : ~. ~J
Page 354 and 355: 1 ! ! O.fi ;0.762 %841 0,769 O,= !0
Page 356 and 357: Ikrdwth-kdlw SF l%quiaiifm K-joint
Page 358 and 359: hdsmthqwdhy W Camputatim l-joint Ax
Page 360 and 361: Ejrnnt flkf+lane SF SaddlePmitim ~,
Page 362 and 363: MAXIMUM PRINCIPAL STRESS SCF = ----
Page 364 and 365: ‘-W, .\ I Ill I : II m -,, !) .
Page 366 and 367: ’ \./ ““’ w~”mm m ““-
Page 368 and 369: . . I Column L’ Longitudinal Gird
Page 370 and 371: C.8 Underwater Engineering Group,
Page 372 and 373: APPENDIX D VORTEX SHEDDING AVOIDANC
Page 374 and 375: a an b d f“ f ar f~ ‘bmax f~ fn
Page 376 and 377: D. VORTEX SHEDDING 0.1. INTRODUCTIO
Page 378 and 379: Vortex Shedding Frequency (f”) fv
Page 380 and 381: waves. When only isolated members u
Page 382 and 383: member’s nominal diameter and thi
Page 384 and 385: \Lf-! of cycles. Thus, the reduced
Page 386 and 387: s ; J steady current, by substituti
Page 388 and 389: Step 3: Obtain a new valueof 1/10 b
Page 390 and 391: vortex shedding will occur, i.e., V
Page 392 and 393: h. The fatigue life may -be modifie
Page 394 and 395: NOTE: The relationship given is bas
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CELL C7: KINEMATIC VISCOSITY = U CE
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COLUMN N: THE STRESS AMPLITUDE IS C
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D.8.3 Devices and Spoilers Devices
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D*9 REFERENCES D.1 King, R., “A R
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Fint Insmbility Rtgion I !%mmd Inat
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.—____ *U.S. E.P.O. :1993-343-273
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COMMllTEE ON MARINE STRUCTURES Comm
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4!! . ,—.-.,
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