OS0707 Creep Damage Evaluation of Super 9Cr Steel by Internal Pressure Creep Test with Thick Specimen

2008 ◽  
Vol 2008 (0) ◽  
pp. _OS0707-1_-_OS0707-2_
Author(s):  
Shigetada HONGOU ◽  
Hiroshige ITO ◽  
Kazuhiro Saito ◽  
Shoichi FUKAMATU
Keyword(s):  
Internal Pressure ◽  
Creep Test ◽  
Creep Damage ◽  
Damage Evaluation ◽  
Thick Specimen ◽  
9Cr Steel

scholarly journals Creep Damage Evaluation of 9Cr-1Mo Steel Weld Joint by Internal Pressure Creep Test

2000 ◽  
Vol 2000 (0) ◽  
pp. 367-368
Author(s):  
Kiyoshi SAITO ◽  
Ryoichi KUME ◽  
Kazunari FUJIYAMA ◽  
Kazunari KIMURA
Keyword(s):  
Internal Pressure ◽  
Creep Test ◽  
Weld Joint ◽  
Creep Damage ◽  
Damage Evaluation ◽  
Steel Weld ◽  
Steel Weld Joint

D122 Creep damage evaluation for high temperature units using small punch creep test

2012 ◽  
Vol 2012.17 (0) ◽  
pp. 131-132
Author(s):  
Toshimi KOBAYASHI ◽  
Toru IZAKI ◽  
Akihiro KANAYA ◽  
Junichi KUSUMOTO ◽  
Hajime WATANABE
Keyword(s):  
High Temperature ◽  
Creep Test ◽  
Creep Damage ◽  
Damage Evaluation ◽  
Small Punch ◽  
Small Punch Creep Test

Full Size Internal Pressure Creep Test for Welded P91 Hot Reheat Piping

2004 ◽  
Author(s):  
Isamu Nonaka ◽  
Takuya Ito ◽  
Fumio Takemasa ◽  
Kensuke Saito ◽  
Yoshikazu Miyachi ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Damage Detection ◽  
Creep Test ◽  
Life Prediction ◽  
Prediction Method ◽  
Creep Damage ◽  
Assessment Method ◽  
Life Assessment ◽  
Full Size ◽  
Test Component

In order to establish the life assessment method for the welded modified 9Cr-1Mo steel hot reheat piping, an internal pressure creep test is conducted with a full size test component. As a result, the fracture mode of the component is clarified and the life prediction method is established. Furthermore, the creep damage detection procedures are proposed.

Full Size Internal Pressure Creep Test for Welded P91 Hot Reheat Elbow

2004 ◽  
Author(s):  
Isamu Nonaka ◽  
Takuya Ito ◽  
Fumio Takemasa ◽  
Kensuke Saitou ◽  
Yoshikazu Miyachi ◽  
...  
Keyword(s):  
Internal Pressure ◽  
Damage Detection ◽  
Creep Test ◽  
Life Prediction ◽  
Prediction Method ◽  
Creep Damage ◽  
Assessment Method ◽  
Life Assessment ◽  
Full Size ◽  
Test Component

In order to establish the life assessment method for the welded modified 9Cr-1Mo steel hot reheat elbow, an internal pressure creep test is conducted with a full size test component. As a result, the fracture mode of the component is clarified and the life prediction method is established. Furthermore, the creep damage detection procedures are proposed.

scholarly journals The Creep-Damage Model of Salt Rock Based on Fractional Derivative

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2349 ◽  
Author(s):  
Hongwei Zhou ◽  
Di Liu ◽  
Gang Lei ◽  
Dongjie Xue ◽  
Yang Zhao
Keyword(s):  
Fractional Derivative ◽  
Creep Test ◽  
Damage Model ◽  
Creep Damage ◽  
Uniaxial Stress ◽  
Radioactive Waste Disposal ◽  
Creep Process ◽  
Salt Rock ◽  
Damage Process ◽  
Creep Damage Model

The use of salt rock for underground radioactive waste disposal facilities requires a comprehensive analysis of the creep-damage process in salt rock. A computer-controlled creep setup was employed to carry out a creep test of salt rock that lasted as long as 359 days under a constant uniaxial stress. The acoustic emission (AE) space-time evolution and energy-releasing characteristics during the creep test were studied in the meantime. A new creep-damage model is proposed on the basis of a fractional derivative by combining the AE statistical regularity. It indicates that the AE data in the non-decay creep process of salt rock can be divided into three stages. Furthermore, the authors propose a new creep-damage model of salt rock based on a fractional derivative. The parameters in the model were determined by the Quasi-Newton method. The fitting analysis suggests that the new creep-damage model provides a precise description of full creep regions in salt rock.

Damage Evolution and Life Prediction of a P91 Longitudinal Welded Tube Under Internal Pressure Creep

2008 ◽  
Author(s):  
Takashi Ogata ◽  
Takayuki Sakai ◽  
Masatsugu Yaguchi
Keyword(s):  
Internal Pressure ◽  
Heat Affected Zone ◽  
Void Growth ◽  
Damage Evolution ◽  
Life Prediction ◽  
Prediction Method ◽  
Creep Damage ◽  
Creep Tests ◽  
Creep Analysis ◽  
Welded Tube

Clarification of creep damage mechanism and establishment of remaining life prediction methods of longitudinal welded piping of P91 steel are important subjects to maintain reliable operation of boilers in thermal power plants. Internal pressure creep tests were conducted on P91 steel longitudinal welded tubes to characterize the evolution of creep damage with time and to evaluate a life prediction method. Interrupted creep tests were utilized for damage observation in addition to rupture tests. Three dimensional FE creep analysis of the creep tested specimens were conducted to identify stress and creep strain distribution within the specimen during creep. Failure occurred at a heat affected zone without significant macroscopic deformation. It was found that initiation of creep voids had concentrated at mid-thickness region rather than surface. The creep analysis results indicated that triaxial tensile stress yielded at the mid-thickness region of the heat affected zone due to difference of creep deformation property between the base metal, heat affected zone and weld metal. It was suggested that the triaxial stress state caused acceleration of the creep damage evolution in the heat affected zone resulting in internal failure of the tube specimens. A rupture time prediction method of the welded tube is proposed based on the maximum principal stress and the triaxial stress factor. Void growth behavior in the heat affected zone was well predicted by the previously proposed void growth simulation method by introducing void initiation function to the method.

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