scholarly journals Creep-Fatigue Damage and Life Evaluation for Boiler Header Stub Weldment.

2003 ◽  
Vol 52 (2) ◽  
pp. 162-166 ◽  
Author(s):  
Takuya ITO ◽  
Isamu NONAKA ◽  
Hideo UMAKI ◽  
Hidetaka NISHIDA ◽  
Shizuma SHINTANI
Keyword(s):  
Fatigue Damage ◽  
Life Evaluation ◽  
Creep Fatigue

Evaluation of Creep-Fatigue Damage Interaction in HK40 Alloy

1993 ◽  
Vol 115 (1) ◽  
pp. 41-46 ◽  
Author(s):  
S. Konosu ◽  
T. Koshimizu ◽  
T. Iijima ◽  
K. Maeda
Keyword(s):  
Fatigue Damage ◽  
Fatigue Behavior ◽  
Cast Steel ◽  
Strain Range ◽  
Slow Waves ◽  
Design Criteria ◽  
Peak Strain ◽  
Life Evaluation ◽  
Creep Fatigue ◽  
Fast Waves

In order to establish design criteria for materials which may sustain creep-fatigue damage, the creep rupture and creep-fatigue behavior of a high-carbon centrifugal cast steel was investigated at three different temperatures of 800, 900, and 1000°C, using HK-40 alloy which is a typical furnace tube material for fuel cell plant reformers and so on. The strain waveforms used for the creep-fatigue tests consisted of triangular waveforms—pp waves (fast-fast waves), cc waves (slow-slow waves), pc waves (fast-slow waves), and cp waves (slow-fast waves)—and a trapezoidal waveform holding the peak strain at the tension side. The applicability of various creep-fatigue interaction damage assessment methods were evaluated with particular emphasis on the life fraction rule (LFR) employed in ASME Section III, Boiler & Pressure Vessel Code Case N-47 and the strain range partitioning method (SRP). As it turned out that through the LFR life evaluation of HK-40 alloy subjected to strain cycling with holding at the tension side was well interpreted, design criteria for reformer tubes were established by applying the LFR to creep-fatigue life evaluation.

Evaluation of Creep-Fatigue Damage Interaction in HK40 Alloy

1991 ◽  
Author(s):  
Shinji Konosu ◽  
Tamotsu Koshimizu ◽  
Takahiro Iijima ◽  
Keikichi Maeda
Keyword(s):  
Fatigue Damage ◽  
Fatigue Behavior ◽  
Cast Steel ◽  
Strain Range ◽  
Slow Waves ◽  
Design Criteria ◽  
Peak Strain ◽  
Life Evaluation ◽  
Creep Fatigue ◽  
Fast Waves

Abstract In order to establish design criteria for materials which may sustain creep-fatigue damage, the creep rupture and creep-fatigue behavior of a high-carbon centrifugal cast steel was investigated at three different temperatures of 800, 900, and 1000°C, using HK-40 alloy which is a typical furnace tube material for fuel cell plant reformers and so on. The strain waveforms used for the creep-fatigue tests consisted of triangular waveforms (pp waves [fast-fast waves], cc waves [slow-slow waves], pc waves [fast-slow waves], and cp waves [slow-fast waves]) and a trapezoidal waveform holding the peak strain at the tension side. The applicability of various creep-fatigue interaction damage assessment methods were evaluated with particular emphasis on the life fraction rule (LFR) employed in ASME Section III, Boiler & Pressure Vessel Code Case N-47 and the strain range partitioning method (SRP). As it turned out that through the LFR life evaluation of HK-40 alloy subjected to strain cycling with holding at the tension side was well interpreted, design criteria for reformer tubes were established by applying the LFR to creep-fatigue life evaluation.

Creep-fatigue interaction on estimation of lifetime and fatigue damage of F82H

2021 ◽  
Vol 173 ◽  
pp. 112830
Author(s):  
Wenhai Guan ◽  
Hyoseong Gwon ◽  
Takanori Hirose ◽  
Hisashi Tanigawa ◽  
Yoshinori Kawamura ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
Creep Fatigue

Management of Complex Loading Histories for Use in Probabilistic Creep-Fatigue Damage Assessments

2018 ◽  
Author(s):  
N. A. Zentuti ◽  
J. D. Booker ◽  
R. A. W. Bradford ◽  
C. E. Truman
Keyword(s):  
Fatigue Damage ◽  
Input Parameter ◽  
Three Dimensional ◽  
Complex Loading ◽  
Fe Model ◽  
Plant Component ◽  
Fatigue Lifetime ◽  
Wide Range ◽  
Stress Components ◽  
Creep Fatigue

An approach is outlined for the treatment of stresses in complex three-dimensional components for the purpose of conducting probabilistic creep-fatigue lifetime assessments. For conventional deterministic assessments, the stress state in a plant component is found using thermal and mechanical (elastic) finite element (FE) models. Key inputs are typically steam temperatures and pressures, with the three principal stress components (PSCs) at the assessment location(s) being the outputs. This paper presents an approach which was developed based on application experience with a tube-plate ligament (TPL) component, for which historical data was available. Though both transient as well as steady-state conditions can have large contributions towards the creep-fatigue damage, this work is mainly concerned with the latter. In a probabilistic assessment, the aim of this approach is to replace time intensive FE runs with a predictive model to approximate stresses at various assessment locations. This is achieved by firstly modelling a wide range of typical loading conditions using FE models to obtain the desire stresses. Based on the results from these FE runs, a probability map is produced and input(s)-output(s) functions are fitted (either using a Response Surface Method or Linear Regression). These models are thereafter used to predict stresses as functions of the input parameter(s) directly. This mitigates running an FE model for every probabilistic trial (of which there typically may be more than 104), an approach which would be computationally prohibitive.

Sign in / Sign up

Export Citation Format

Share Document