21411 The Simplified J-integral Evaluation Method for Perforated Plate at Elevated Temperature by Reference Stress Method

2010 ◽  
Vol 2010.16 (0) ◽  
pp. 481-482
Author(s):  
Masahide IGUCHI ◽  
Osamu WATANABE
Keyword(s):  
Elevated Temperature ◽  
Evaluation Method ◽  
Perforated Plate ◽  
J Integral ◽  
Integral Evaluation ◽  
Reference Stress

Creep-Fatigue Life Evaluation Method for Perforated Plates at Elevated Temperature

2005 ◽  
Vol 128 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Osamu Watanabe ◽  
Takuya Koike
Keyword(s):  
Elevated Temperature ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Evaluation Method ◽  
Three Dimensional ◽  
Perforated Plate ◽  
Dimensional Structure ◽  
Creep Process ◽  
Plastic Behavior ◽  
Creep Fatigue

The accurate evaluation scheme for creep-fatigue strength is one of the continuing main issues for elevated temperature design; particularly, the three-dimensional structure having stress concentration is becoming more important. The present paper investigates fatigue strength and creep-fatigue strength of perforated plate having stress concentration as an example. The specimens are made of type 304 SUS stainless steel, and the temperature is kept to 550°C. The whole cycles of the experiment record are analyzed, and the characteristics of the structure having stress concentration are discussed. The present paper employs stress redistribution locus (abbreviated as SRL) in evaluation plastic behavior in cyclic fatigue process as well as stress relaxation in creep process, and the feasibility is discussed in conjunction with the comparison to experimental results.

scholarly journals Proposal of Simplified J-Integral Evaluation Method for a Through Wall Crack in SFR Pipe Made of Mod.9Cr-1Mo Steel

2018 ◽  
Author(s):  
Takashi Wakai ◽  
Hideo Machida ◽  
Manabu Arakawa ◽  
Koichi Kikuchi
Keyword(s):  
Failure Analysis ◽  
Evaluation Method ◽  
Large Diameter ◽  
Parameter Method ◽  
Piping System ◽  
J Integral ◽  
Loading Conditions ◽  
Integral Evaluation ◽  
Material Characteristics ◽  
Unstable Failure

A simplified J-integral evaluation method applicable to unstable failure analysis in Leak Before Break (LBB) assessment of Sodium-cooled Fast Reactor (SFR) in Japan was proposed. Mod.9Cr-1Mo steel is supposed to be a candidate material for the coolant systems of SFR in Japan. This steel has relatively high yield strength and poor fracture toughness comparing to those of conventional austenitic stainless steels. In addition, SFR pipe has small thickness and large diameter. Furthermore, in SFR, primary stresses are insignificant and displacement controlled secondary stresses are predominant. Therefore, the load balance in such piping system changes by crack extension and R6 (2-parameter) method (hereinafter “2-parameter method”) [1] using J-integral is applicable to unstable failure analysis for the pipes under such loading conditions. As a J-integral evaluation method for circumferential through-wall crack in a cylinder, EPRI has proposed a fully plastic solution method. However, the geometry of SFR pipe and material characteristics of Mod.9Cr-1Mo steel exceed the applicable range of EPRI’s method. Therefore, a series of elastic, elasto-plastic and plastic finite element analyses (FEA) were performed for a pipe with a circumferential through-wall crack to propose a J-integral evaluation method applicable to such loading conditions. J-integrals obtained from the FEA were resolved into elastic, local plastic and fully plastic components. Each component was expressed as a function of analytical parameter, such as pipe geometries, crack size, material characteristics and so on. As a result, a simplified J-integral evaluation method was proposed. The method enables to conduct 2-parameter method using J-integral without any fracture mechanics knowledge.

J-integral evaluation in cracked wood specimen using the mark tracking method

2012 ◽  
Vol 47 (2) ◽  
pp. 257-267 ◽  
Author(s):  
Octavian Pop ◽  
Frédéric Dubois ◽  
Joseph Absi
Keyword(s):  
Wood Specimen ◽  
J Integral ◽  
Tracking Method ◽  
Integral Evaluation
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