scholarly journals Strength of Materials at Elevated Temperatures. Type IV Cracking and Life Evaluation of Weldments on 2.25Cr-1Mo Steel under Creep-Fatigue Loading Condition.

1999 ◽  
Vol 48 (2) ◽  
pp. 137-143 ◽  
Author(s):  
Takashi OGATA ◽  
Masatsugu YAGUCHI
Keyword(s):  
Loading Condition ◽  
Elevated Temperatures ◽  
Fatigue Loading ◽  
Strength Of Materials ◽  
Type Iv ◽  
Life Evaluation ◽  
Creep Fatigue ◽  
Type Iv Cracking

Study on Creep-Fatigue Damage Evaluation for Boiler Weldment Parts

2000 ◽  
Vol 123 (1) ◽  
pp. 105-111 ◽  
Author(s):  
Takashi Ogata ◽  
Masatsugu Yaguchi
Keyword(s):  
Weld Joint ◽  
Creep Damage ◽  
Fem Analysis ◽  
Fatigue Tests ◽  
Type Iv ◽  
Fine Grain ◽  
Creep Fatigue ◽  
Damage Accumulation Model ◽  
Type Iv Cracking ◽  
Failure Life

Creep-fatigue tests on the heat-affected zone(HAZ) simulated materials, base metal, weld metal and weld joint of 2.25Cr-1Mo steel, and elastic-plastic and creep FEM analysis for the weld joint were conducted. It was found from the comparison between experimental evidences and the analytical results that “Type IV” cracking was caused by two major reasons. One is accumulation of creep strain during strain hold in the fine-grain region is larger than that in other regions, suggesting progress of creep damage in the fine-grain region prior to other regions. The other is existence of triaxial tensile stress field within the fine-grain region caused reduction of failure ductility. Crack initiation portion and failure life under the creep-fatigue test could be well predicted by the nonlinear damage accumulation model based on the FEM analysis results.

scholarly journals Study on deformation behavior and life evaluation method for SUS304 notched plate under bending creep fatigue loading.

1990 ◽  
Vol 39 (442) ◽  
pp. 982-988
Author(s):  
Yoshio FUKUDA ◽  
Yoshimi SATOH ◽  
Kazuhiro NAKAMURA ◽  
Yukio TAKAHASHI ◽  
Kazuo KUWABARA
Keyword(s):  
Deformation Behavior ◽  
Evaluation Method ◽  
Fatigue Loading ◽  
Life Evaluation ◽  
Creep Fatigue
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