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ssc-367 - Ship Structure Committee

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●<br />

Stress concentrationfactors; includingcollating of existing<br />

data, calibration of SCF equations and development of<br />

parametric equations.<br />

●<br />

Fatigue analysis and design methods; includingfinite element<br />

analysis procedures and application of fatigue design rules.<br />

●<br />

Fatigue resistance; including simple plate S-N curves and<br />

complex details, S-N curves for stiffened joints and S-N<br />

curves for different materials.<br />

●<br />

Effect of various parameters on fatigue life; including the<br />

effect of cathodicprotectionin seawater,plate thicknessand<br />

weld profile effects.<br />

●<br />

Fatigue<br />

life improvementtechniques.<br />

●- Fatigue<br />

damage,<br />

life determination; including review of cumulative<br />

assessment of random loading and low cycle fatigue.<br />

9.4.3 Cost-EffectiveAnalysis Strategies<br />

Acost-effective analysesstrategy is relativelyeasy to develop for<br />

any marine structure. First, the structure configuration and the<br />

likely marine environment should be assessed to determine<br />

susceptibility of the structure to fatigue. Second, structure<br />

configuration and operational response characteristics should be<br />

assessed to determinethe desirable analyses techniques to generate<br />

the loads and to determine the response of the structure.”<br />

Although computer cost is an important variable in developing an<br />

analysis strategy, computer cost should be assessed in conjunction<br />

with engineering time and effort as well as the time available to<br />

completethe fatigueanalysisand design. Most important,design is<br />

an iterative process and structural changes will invariably occur<br />

during fatigue analysis. Thus, fatigue analysis should be treated<br />

9-21

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