## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 3American Society of Mechanical Engineers, 2002 - Arctic regions |

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Page 89

Normal

following equation : S " = ĖS ( 16 ) Since S " ( i = 1,2 , . , n ) in the Eq.16 may be

treated as a group of independent random variables , it can be assumed that S ; ”

is a ...

Normal

**distribution**method The equivalent fatigue stress is calculated by thefollowing equation : S " = ĖS ( 16 ) Since S " ( i = 1,2 , . , n ) in the Eq.16 may be

treated as a group of independent random variables , it can be assumed that S ; ”

is a ...

Page 93

For lognormal

+ C ) ( 42 ) For Weibull

following equations : N = nr ( 1 / m + 1 ) ( 43 ) C = C ( 2 / m + 1 ) / r ? ( 1 / m +1 ) -1

...

For lognormal

**distribution**, we have H = In N. = In N- \ n ( 1 + C ; ) ( 41 ) o ' = In ( 1+ C ) ( 42 ) For Weibull

**distribution**with 2 parameters , it is required to solve thefollowing equations : N = nr ( 1 / m + 1 ) ( 43 ) C = C ( 2 / m + 1 ) / r ? ( 1 / m +1 ) -1

...

Page 615

Recho ( 31 ) proposed a method to backtrack the initial defect size

from fatigue experiment results of welded joints by using LEFM and Miner's sum .

Palmerg et al ( 61 ) used the concept of equivalent initial flaw size in the ...

Recho ( 31 ) proposed a method to backtrack the initial defect size

**distribution**from fatigue experiment results of welded joints by using LEFM and Miner's sum .

Palmerg et al ( 61 ) used the concept of equivalent initial flaw size in the ...

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alloys analysis applied approximately assessment bending calculated carried coating compared composite compressive considered corrosion crack crack growth curve cycles damage defect deformation depth determined developed direction distribution effect element Engineering equation estimated evaluation experience factor failure fatigue field Figure flaw flexible fracture function geometry given Grade heat higher hydrogen important increase initial installation insulation integrity International joint length limit load locations lower material maximum mean measured mechanical method observed obtained Offshore operation parameters performed pipe plate predicted present pressure problem procedure production properties range reliability residual resistance respectively riser rope safety samples shown shows side simulation solution specimens standard steel strain strength stress structure surface Table temperature tensile tension thermal thickness titanium toughness uncertainties variables weld