... pressure creep tests were conducted on P91 steel longitudinal welded tubes to characterize the evolution of creep damage with time and to evaluate a life prediction method. Interrupted creep tests were performed for damage observation in addition to rupture tests. Three dimensional finite element creep...

... , Subsection Z Technical Appendix A3, Design and Construction Rules for Mechanical Components of FBR Nuclear Islands, 2002 Edition. 16 03 2008 03 10 2008 07 04 2009 austenitic stainless steel creep creep testing fatigue cracks fatigue testing welding An assessment...

... the processes and mechanisms of Type IV creep damage using Mod.9Cr–1Mo (ASME Grade 91) steel weldments. Long-term creep tests for base metal, simulated fine-grained HAZ, and welded joints were conducted at 550 ° C , 600 ° C , and 650 ° C . Furthermore, creep tests of thick welded joint specimens were...

...S. Peravali; T. H. Hyde; K. A. Cliffe; S. B. Leen Past studies from creep tests on uniaxial specimens and Bridgman notch specimens, for a P91 weld metal, showed that anisotropic behavior (more specifically transverse isotropy) occurs in the weld metal, both in terms of creep (steady-state) strain...

.... Positive nonlinear rate sensitivity was observed in monotonic loading. Creep response was found to be significantly influenced by prior stress rate. The effect of loading history on creep was studied in stepwise creep tests, where specimens were subjected to a constant stress rate loading followed...

... similar to those used for creep testing). At 500 – 600 ° C , 2.25 Cr - 1 Mo steels showed a superior oxidation resistance than 1.25 Cr - 0.5 Mo steels. However, at 700 ° C , the oxidation resistance of 1.25 Cr - 0.5 Mo and 2.25 Cr - 1 Mo steels was similar. Multilayer oxide formation was observed to occur...

.... For the precise creep damage prediction, it will be necessary to have a database from the real boiler piping as well as for creep test specimens. The parameter fluctuation becomes small after the middle stage of the creep damage process. It is considered that the creep damage becomes a dominant indication...

... the background for the rules. 19 07 2005 10 10 2005 code standards creep fracture creep testing weld strength creep ASME B31.3 weldment creep rupture Welds have been known to perform worse with respect to creep life than the base material in some circumstances. The difference...

... by the PVP Division December 12, 2002; revision received September 23, 2003. Associate Editor: R. J. Scavuzzo. 12 December 2002 23 September 2003 05 05 2004 stress analysis failure analysis pipelines creep elastoplasticity finite element analysis creep testing geometry...

... displacements and updated pressure are taken into account, while at lower temperatures coupling between damage and deformation is necessary. Examples based on some RUPTHER creep test predictions are given. Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels...

... Creep Rupture Properties of FBR Grade 316 S.S. ,” J. Nucl. Mater. , 271&272 , pp. 173 – 178 . Gilbert , E. R. , and Harding , N. E. , 1969 , “ Comparison of In-Reactor Creep and Postirradiation Creep Tests of Structural Materials for Nuclear Applications ,” ASTM Spec. Tech. Publ...

...Levi O. Bueno; Luiz Marino The oxide-scale growth and metal loss kinetics during oxidation in air of 2 1/4 Cr-1 Mo steel were studied at 600, 700, and 800°C for times up to 1000 h, with cylindrical specimens similar to creep test pieces. The scale thickness (x) was observed to exhibit a gradually...

... boilers pressure vessels creep testing fatigue testing steel alloy steel molybdenum alloys chromium alloys elasticity plasticity tensile strength Creep cavity and crack initiation incidents in boiler weldment parts of long-term used boilers are recently reported 1 2 3 4 5 6 7...

... fracture mechanical engineering computing mechanical testing creep testing strain measurement With the availability today of powerful personal computers and the easier access to inelastic finite element programs, pressure component designers now have the ability to tackle problems involving...

... . Manuscript received by the PVP Division, April 8, 1998; revised manuscript received July 6, 2000. Technical Editor: S. Y. Zamrik. 08 April 1998 06 July 2000 creep creep testing pressure vessels Creep Larson-Miller Parameter Data Analysis Life Distribution Least-Squares Method...

... was sufficiently large to give an adequate sample cross section for reproducible creep testing. Replicate tests of three or more specimens typically gave substantially the same creep rates (within about + or −20 percent). An adequate gage length for testing was about 5/8 in., although longer was used when possible...

.... Displacement-controlled stresses are repeated or cyclic, relax with time, and have been known to cause failure. thermal stresses stress relaxation turbines high-temperature effects creep testing stainless steel failure analysis pressure vessels fracture toughness 01 August 1999 15...

... creep testing high-temperature techniques finite element analysis stress relaxation notch testing heat treatment In many components operating at high temperatures, there are inevitably geometrical discontinuities. These discontinuities have a strong effect on the material fatigue life due...

... Samples ,” ASME J. Eng. Mater. Technol. , 104 , Jan., pp. 36 – 40 . Hyde , T. , and Sun , W. , 1997 , “ Stress Singularities at the Free Surface of an Axisymmetric Two-Material Creep Test Specimen ,” J. Strain Anal. , 32 , No. 2 , pp. 107 – 117 . Sandstrom , R. , and Tu , S...

... for several reasons, including the fact that personnel tend to lose confidence in the design of piping exhibiting large deflection. A general rule of thumb in design of process piping is to limit the deflection to 1/2 in. (13 mm). pressure vessels high-temperature effects creep testing supports...