Numerical investigation of factors affecting creep damage accumulation in ASME P92 steel welded joint

2012 ◽  
Vol 34 ◽  
pp. 566-575 ◽  
Author(s):  
Lei Zhao ◽  
Hongyang Jing ◽  
Lianyong Xu ◽  
Junchao An ◽  
Guangchun Xiao
Keyword(s):  
Numerical Investigation ◽  
Damage Accumulation ◽  
Welded Joint ◽  
Creep Damage ◽  
P92 Steel ◽  
Factors Affecting

Numerical Simulation of Stress Relaxation and Creep Response of X20 Steam Piping under Diverse Operating Conditions

2021 ◽  
Vol 57 ◽  
pp. 19-32
Author(s):  
Smith Salifu ◽  
Dawood A. Desai ◽  
Schalk Kok
Keyword(s):  
Steady State ◽  
Stress Relaxation ◽  
Damage Accumulation ◽  
Creep Behaviour ◽  
Creep Damage ◽  
Operating Conditions ◽  
Creep Model ◽  
Element Analysis ◽  
Peak Period ◽  
Creep Response

The creep response and stress relaxation of X20 CrMoV12-1 steam piping under diverse operating conditions were simulated using finite element analysis (FEA) code, Abaqus alongside fe-safe/Turbolife software. In the study, steady-state creep and creep analysis characterized by 24 hours daily cycle consisting of a total of 6 hours peak, 4 hours transient and 14 hours off-peak period was considered. Modified hyperbolic sine creep model used in the analysis was implemented in Abaqus via a special creep user-subroutine to compute the stress relaxation and creep behaviour, while the useful service life and creep damage was estimated using fe-safe/Turbolife. The optimum creep strain, stress, damage, and worst life were found at the intrados of the piping, with the steady-state analysis having a higher useful creep life and slower creep damage accumulation. Furthermore, slower stress relaxation with faster damage accumulation was observed in the analysis involving cycles. Finally, a good agreement was obtained between the analytical calculated and simulated rates of the piping.

Effect of multiaxial stress state on creep damage in ASME T92 welded joint

2020 ◽  
Vol 43 (5) ◽  
pp. 907-918
Author(s):  
Xiao Wang ◽  
Xue Wang ◽  
Chuang Wang ◽  
Ya‐Lin Zhang ◽  
Qiao‐Sheng Huang
Keyword(s):  
Stress State ◽  
Welded Joint ◽  
Creep Damage ◽  
Multiaxial Stress ◽  
Multiaxial Stress State

scholarly journals Estimating the Influences of Prior Residual Stress on the Creep Rupture Mechanism for P92 Steel

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 639 ◽  
Author(s):  
Dezheng Liu ◽  
Yan Li ◽  
Xiangdong Xie ◽  
Guijie Liang ◽  
Jing Zhao
Keyword(s):  
Residual Stress ◽  
Flow Stress ◽  
Power Plants ◽  
Creep Damage ◽  
Creep Rupture ◽  
Transgranular Fracture ◽  
Creep Tests ◽  
Energy Principle ◽  
P92 Steel ◽  
Rupture Mechanism

Creep damage is one of the main failure mechanisms of high Cr heat-resistant steel in power plants. Due to the complex changes of stress, strain, and damage at the tip of a creep crack with time, it is difficult to accurately evaluate the effects of residual stress on the creep rupture mechanism. In this study, two levels of residual stress were introduced in P92 high Cr alloy specimens using the local out-of-plane compression approach. The specimens were then subjected to thermal exposure at the temperature of 650 °C for accelerated creep tests. The chemical composition of P92 specimens was obtained using an FLS980-stm Edinburgh fluorescence spectrometer. Then, the constitutive coupling relation between the temperature and material intrinsic flow stress was established based on the Gibbs free energy principle. The effects of prior residual stress on the creep rupture mechanism were investigated by the finite element method (FEM) and experimental method. A comparison of the experimental and simulated results demonstrates that the effect of prior residual stress on the propagation of micro-cracks and the creep rupture time is significant. In sum, the transgranular fracture and the intergranular fracture can be observed in micrographs when the value of prior residual stress exceeds and is less than the material intrinsic flow stress, respectively.

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