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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.,
- Page 230 and 231: 4.12 Daidola, J.C., and Basar, N.S.
- Page 232 and 233: 5.4 Papanikolaou,A. and Zaraphoniti
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- Page 236 and 237: “7.2 Jordan, C.R., and Cochran, C
- Page 238 and 239: 7.19 Niemi, E.J., “FatigueTests o
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- Page 250 and 251: APPENDIX A REVIEW OF OCEAN ENVIRONM
- Page 252 and 253: The most distinctive feature-of a r
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- Page 262 and 263: H~ is the significantwave height, a
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- Page 270 and 271: Sample Wave scatter Diagram s 12 +.
- Page 272 and 273: Nm is the total number of waves in
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- Page 276 and 277: Applied Wind Speed Vz(t) ft/s (m/s)
- Page 278 and 279: A.1O REFERENCES A*I Mechanics of Wa
- Page 282 and 283: B. REVIEW OF LINEAR SYSTEM RESPONSE
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- Page 286 and 287: B.2.2.1 Equation of Motions By assu
- Page 288 and 289: X(w) = A*RAO(w)*cos(wt+ O(W)). When
- Page 290 and 291: [dn/dx]max= aW2/g . Squaring the eq
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- Page 296 and 297: 0.3 EXTREME RESPONSE The extreme re
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- Page 302 and 303: APPENDIX C STRESS CONCENTRATIONFACT
- Page 304 and 305: c. STRESSCONCENTRATIONFACTORS. C.1
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- Page 308 and 309: C.2.2 Smedley-Wordsworth The Smedle
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- Page 317 and 318: (3) Table 2 only .. (l)-~f~ ~ 0.95
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- Page 321 and 322: 5 4 L u w 3“ 9 t o -. ii Ic Kuang
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j K Out— ~lanq SCF ‘?’ + F .
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, 5 Smediey-Wordswotih SCF Computat
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Smedley-Wordswotih SCFComputation *
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C.3.l(e) Smedley-Wordsworth Chord S
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\ Smedley-Wordswoti SCF Computation
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C.3.2 Tables The Kuang and Smedley-
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I@q W ~tim T-juint Axial W Owd Side
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-- -- -- .- -- -- -- -- -- -- .- --
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— T-joint hid S5 Crm i%itim 1 1 1
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. T-joint In-PlaneSE UM P~itim ., 1
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— i : m ! 0.3: O*5: 0.7: o*?: 0.3
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Ku&W Cr@atim K-jrnntiht++laae SF M
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!WsA-MIEy SF bqutaticm K-joint Axia
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-- ..—--- ------ -- ------ ------
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kbrdwmii%dl~y SCFComputation ,..-,
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C.4 FINITE ELEMENT ANALYSES RESULTS
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,. .. ..-. __ _________ ._ _ ______
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—..—.— -.. — 7 a . LOWER HU
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. Loading ~ Figure C.4-4 Equivalent
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C.5 REFERENCES C.1 Kuang, J.G. et a
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NOMENCLATURE co CLj CLO o ‘tot DI
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x (THIS PAGE INTENTIONALLY LEFT BIA
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shedding frequency to synchronize w
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deflection and stability parameters
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a fn = ~ (EI/mi L4)% where: the mom
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0.3.1 In-Line Vortex Shedding . In-
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0.4.1 In-LineVortex Sheddinq Amplit
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CLO = base lift coefficient = 0.29
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The vortex shedding bending stress
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a. Depending on marine structure in
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c constant (See Vr reduced velocity
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D.7.2 Analysis for Wind-Induced Cro
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I . + [ (+)-L (+ - t)4] (cm4) COLUM
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Experiments have shown- that for a
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Shrouds Shrouds consist of an outer
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Harmonic Flow, Royal Institute of N
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o.: Q., 0“.. 0.1 0.1 * REGION 0 9
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SHIP STRUCTURE COMMITTEE PUBLICATIO