Creep analysis of pressurized circumferential pipe weldments—a review

Hyde, T H; Sun, Wei; Williams, John A.

doi:10.1243/030932403762671854

Cited by 59 publications

(43 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nondestructive inspection of the Takashi HONDA*, Takuya FUKAHORI*, Toshihide IGARI*, Yasuharu CHUMAN*, Takumi TOKIYOSHI* and Alan CF COCKS** surface and subsurface of pipe welds is carried out to examine the current damage, such as the cavity density, and the results are employed to guide simulation-based predictions. Several approaches can be taken in terms of damage simulation for Type IV failure, such as: continuum mechanics together with the stress-based time fraction or the ductility fraction of the material; creep fracture mechanics using the C* parameter (Yatomi et al, 2003, Segle et al, 2000; creep cavitation mechanics assuming diffusion (Rice, 1981); use of a grain boundary-resistance model (Fukahori, et al, 2013; and/or damage mechanics (Hyde et al, 2003, Yao et al, 2007. It remains difficult, however, to determine an optimal method for expressing both the microscopic and macroscopic phenomena of actual Type IV damage.…”

Section: Introductionmentioning

confidence: 99%

Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel

Honda

Fukahori

Igari

et al. 2017

Mechanical Engineering Journal

View full text Add to dashboard Cite

From the standpoint of evaluating Type IV creep damage in the fine-grained heat affected zones (FGHAZ) of welded joints, an analysis method combining continuum damage mechanics (CDM) and a cavity nucleation model is proposed and applied to the creep testing of simulated-FGHAZ notched bars of mod. 9Cr-1Mo steel at 650℃. The Perrin-Hayhurst CDM model is adopted, which considers both softening by precipitate coarsening and damage by creep cavities. For the cavity nucleation model, a proposal by Gonzalez and Cocks is employed, which considers the randomness of grain-boundary-facet orientations in a polycrystalline material and gives a nucleation rate that is a function of the creep strain rate and a tri-axiality factor. The critical value of the damage parameter, corresponding to the initiation of micro cracks due to the coalescence of creep cavities, is expressed in terms of a critical value of the number density of creep cavities as determined from grain-boundary-resistance model simulations by the present authors. Creep rupture experiments have been conducted for circumferentially notched bar specimens with two kinds of notch acuities. The applicability of the combined CDM and cavity nucleation model is demonstrated by comparing the distribution of creep cavities observed experimentally with the simulation results. The final rupture life of the circumferentially notched bar specimens was also predicted to within a factor of two.

show abstract

Section: Introductionmentioning

confidence: 99%

Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel

Honda

Fukahori

Igari

et al. 2017

Mechanical Engineering Journal

View full text Add to dashboard Cite

show abstract

“…For example, the stresses and failure behaviour of pipe weldments under creep condition have been modelled successfully by Hyde et al [5]. Similar studies have been carried out, for a P91 steel, in order to develop a creep constitutive model with a damage capability [6].…”

Section: Introductionmentioning

confidence: 99%

Characterization of viscoplasticity behaviour of P91 and P92 power plant steels

Saad

Hyde

Sun

et al. 2013

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

This paper deals with the determination of material constitutive model for P91 and P92 steels at high temperatures. An isothermal, strain-controlled test programme was conducted for both steels for a temperatre range between 400 and 675˚C. The experimental data from these tests were used to obtain the material constants in a viscoplasticity model. The model includes the effects of isotropic and kinematic hardening, as well as time-dependent effects, has been used to model the cyclic material behaviour of each material. Material constants were initially determined from initial cycle stress-strain data, maximum stress evolution data and stress relaxation data. The material constants were improved by use of a least-squares optimisation algorithm. The constitutive models have been implemented into the ABAQUS finite element (FE) code by using the Z-mat software. The performances of the material models for both steels have been assessed by comparing predictions with experimental data obtained from the tests.

show abstract

“…There are several approaches to Type IV damage, such as continuum mechanics together with the stressbased time fraction or the ductility fraction of the material (3) , damage mechanics on the basis of the effective stress reflecting the damage parameter (4) , creep fracture mechanics using the C * parameter (5) - (7) , and creep void mechanics assuming diffusion (8) . There is not a method currently available, however, that can simulate both microscopic damage such as the initiation and coalescence of the cavities, and the progress of macroscopic damage such as the distribution of the cavities or the growth of the crack-like defects in the welded joints with stress distribution.…”

Section: Introductionmentioning

confidence: 99%

Micro-Macro Combined Simulation of the Damage Progress in Low-Alloy Steel Welds Subject to Type IV Creep Failure

Kawashima

Igari

Tokiyoshi

et al. 2004

JSME Int. J., Ser. A

View full text Add to dashboard Cite

A simulation method for microscopic creep damage at grain boundaries in the fine-grain heat-affected zone of low-alloy steel welds involving high energy piping was proposed on the basis of the combination of elastic-creep FEM analysis and random fracture resistance modeling of the materials. First, the initiation and growth-driving forces of small defects were concretely determined based on microscopic observation of the damage progress at the grain boundaries of the material, taking into account dependence on stress and temperature. Then, a simulation procedure combining the stress distribution from elastic-creep FEM and the random fracture resistance model was proposed, and this procedure was applied to the simulation of the microscopic damage progress in a welded joint model test and in actual power piping. The results in terms of the simulated number density of small defects throughout the wall thickness were in good agreement with the observed results.

show abstract

Creep analysis of pressurized circumferential pipe weldments—a review

Cited by 59 publications

References 38 publications

Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel

Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel

Characterization of viscoplasticity behaviour of P91 and P92 power plant steels

Micro-Macro Combined Simulation of the Damage Progress in Low-Alloy Steel Welds Subject to Type IV Creep Failure

Contact Info

Product

Resources

About