Abstract
Structures operating in the creep regime will consume
their creep life at a greater rate in locations where the
stress state is aggravated by triaxiality constraints.
Many structures, such as the welded steam mixer studied
here, also have multiple material zones differing in
microstructure and material properties. The 3-dimensional
structure as such in addition to interacting material
zones is a great challenge for finite element analysis
(FEA), even to accurately pinpoint the critical locations
where damage will be found. The studied steam mixer, made
of 10CrMo 9-10 steel (P22), has after 100 000 hours of
service developed severe creep damage in the several
saddle point positions adjacent to nozzle welds.
FE-simulation of long term behaviour of this structure
has been performed taking developing triaxiality
constraints, material zones and primary to tertiary creep
regimes into account. The creep strain rate formulation
is based on the logistic creep strain prediction (LCSP)
model implemented to ABAQUS, including primary, secondary
and tertiary creep. The results are presented using a
filtering technique utilising the formulation of rigid
plastic deformation for describing and quantifying the
developing "creep exhaustion".
Original language | English |
---|---|
Title of host publication | Proceedings of the ASME 2008 Pressure Vessels & Piping Conference, PVP 2008 |
Place of Publication | New York, NY |
Publisher | American Society of Mechanical Engineers (ASME) |
Pages | 505-510 |
Volume | 7 |
ISBN (Print) | 978-0-7918-4830-2 |
DOIs | |
Publication status | Published - 2008 |
MoE publication type | A4 Article in a conference publication |
Event | ASME 2008 Pressure Vessels and Piping Conference, PVP 2008 - Chicago, Illinois, United States Duration: 27 Jul 2008 → 31 Jul 2008 |
Conference
Conference | ASME 2008 Pressure Vessels and Piping Conference, PVP 2008 |
---|---|
Abbreviated title | PVP 2008 |
Country/Territory | United States |
City | Chicago, Illinois |
Period | 27/07/08 → 31/07/08 |