Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 9, Part 5American Society of Mechanical Engineers, 1990 - Arctic regions |
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Page 28
... crack exten- sion method by Parks ( 1974 ) . The 1 / √r singularity at the crack tip was simulated by placing the midpoints of the crack tip elements at the quarter positions ( Barsoum , 1976 ) . A recently developed special filter ...
... crack exten- sion method by Parks ( 1974 ) . The 1 / √r singularity at the crack tip was simulated by placing the midpoints of the crack tip elements at the quarter positions ( Barsoum , 1976 ) . A recently developed special filter ...
Page 29
J - value . The radially orientated crack tip of an ensemble is thus sub- jected to larger stress intensities than a single radial crack under pure mode l - loading . A very important result can thus be stated as : A radially ending crack ...
J - value . The radially orientated crack tip of an ensemble is thus sub- jected to larger stress intensities than a single radial crack under pure mode l - loading . A very important result can thus be stated as : A radially ending crack ...
Page 32
... crack tip : J Circumferential crack tip : [ N / mm⚫ 10-5 ] 8.48 R35 b 6.26 6.09 5.84 1.19 R35 d 7.84 Fig.5 : Crack ensemble and radial crack R45a - i ; all crack ensembles have identical crack tip nodal positions . Only the deformation ...
... crack tip : J Circumferential crack tip : [ N / mm⚫ 10-5 ] 8.48 R35 b 6.26 6.09 5.84 1.19 R35 d 7.84 Fig.5 : Crack ensemble and radial crack R45a - i ; all crack ensembles have identical crack tip nodal positions . Only the deformation ...
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addition analysis applied approach assessment assumed bending calculations caused considered CONTINUE corrosion crack damage deformation depth described diameter direction displacement distribution effect energy Engineering ensemble equations factors failure field Figure flow force fracture function given hole included increase initial installation internal layer length limit load material maximum mean measured mechanical method mode movement obtained occurred Offshore operation parameters pipe pipeline plastic plate platform position predicted presented pressure probability problem procedure properties radial range reduced relative reliability resistance response safety scaling scour seabed shown shows simulated soil solution span stability steel strain strength stress structure subsea surface Table term thickness toughness tracers tube uncertainty values valve variables wall wave weight weld