Characterization of material constraint effects on creep crack growth for welded joints by a new constraint parameter Q* M

2021 ◽  
pp. 108085
Author(s):  
Hongyang Jing ◽  
Yu Xiong ◽  
Lei Zhao ◽  
Lianyong Xu ◽  
Yongdian Han
Keyword(s):  
Crack Growth ◽  
Welded Joints ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Constraint Effects

Geometry and Material Constraint Effects on Creep Crack Growth Behavior in Welded Joints

2017 ◽  
Vol 36 (2) ◽  
pp. 155-162 ◽  
Author(s):  
Y. Li ◽  
G. Z. Wang ◽  
F. Z. Xuan ◽  
S. T. Tu
Keyword(s):  
Crack Growth ◽  
Welded Joints ◽  
Creep Crack Growth ◽  
Stress Triaxiality ◽  
Life Assessment ◽  
Crack Growth Behavior ◽  
Creep Crack ◽  
Constraint Effects ◽  
Creep Life Assessment ◽  
Material Constraints

AbstractIn this work, the geometry and material constraint effects on creep crack growth (CCG) and behavior in welded joints were investigated. The CCG paths and rates of two kinds of specimen geometry (C(T) and M(T)) with initial cracks located at soft HAZ (heat-affected zone with lower creep strength) and different material mismatches were simulated. The effect of constraint on creep crack initiation (CCI) time was discussed. The results show that there exists interaction between geometry and material constraints in terms of their effects on CCG rate and CCI time of welded joints. Under the condition of low geometry constraint, the effect of material constraint on CCG rate and CCI time becomes more obvious. Higher material constraint can promote CCG due to the formation of higher stress triaxiality around crack tip. Higher geometry constraint can increase CCG rate and reduce CCI time of welded joints. Both geometry and material constraints should be considered in creep life assessment and design for high-temperature welded components.

GS12 Characterization of side-groove geometry of C(T) specimen used for creep crack growth test based on micro damage mechanics

2014 ◽  
Vol 2014 (0) ◽  
pp. _GS12-1_-_GS12-3_
Author(s):  
Takahiro FUKUDA ◽  
Haruhisa SHIGEYAMA ◽  
A. Toshimitsu YOKOBORI Jr. ◽  
Ryuji SGIURA
Keyword(s):  
Crack Growth ◽  
Damage Mechanics ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Growth Test

Characterization of incubation time on creep crack growth for weldments of P92

2010 ◽  
Vol 77 (15) ◽  
pp. 3053-3065 ◽  
Author(s):  
Ryuji Sugiura ◽  
A. Toshimitsu Yokobori ◽  
Kazuto Suzuki ◽  
Masaaki Tabuchi
Keyword(s):  
Crack Growth ◽  
Incubation Time ◽  
Creep Crack Growth ◽  
Creep Crack

Experimental Investigation of Constraint Effects on Creep Crack Growth

2002 ◽  
Author(s):  
Adam D. Bettinson ◽  
Noel P. O’Dowd ◽  
Kamran M. Nikbin ◽  
George A. Webster
Keyword(s):  
Stainless Steel ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Compact Tension ◽  
Growth Data ◽  
Creep Crack ◽  
Low Constraint ◽  
Constraint Effects ◽  
Crack Growth Model ◽  
Crack Growth Rates

In this work the effects of specimen size and type on creep crack growth rates in stainless steel are examined. Experiments have been carried out on high constraint compact tension specimens (CT) and low constraint centre cracked panels (CCP) of ex-service 316H stainless steel. All testing was carried out at 550°C. Constraint effects have been observed in the data, with the large CT specimens having the fastest crack growth rate and the small CCP specimens the slowest. These trends are consistent with those that would be predicted from two parameter (C*–Q) theories. However, it is found that a constraint dependent creep crack growth model based on ductility exhaustion overpredicts the constraint dependence of the crack growth data.

scholarly journals Characterization of Creep Crack Growth Rate at the Early Stage and Estimation of Creep Crack Initiation Life for High Cr Steels and Their Weldments

2013 ◽  
Vol 62 (2) ◽  
pp. 68-74
Author(s):  
Ryuji SUGIURA ◽  
A. Toshimitsu YOKOBORI, Jr. ◽  
Kazuto SATO ◽  
Masaaki TABUCHI ◽  
Kenichi KOBAYASHI ◽  
...  
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Initiation ◽  
Crack Growth ◽  
Early Stage ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Creep Crack Growth Rate ◽  
Crack Initiation Life

Unified correlation of geometry and material constraints with creep crack growth rate of welded joints

2016 ◽  
Vol 163 ◽  
pp. 220-235 ◽  
Author(s):  
H.S. Ma ◽  
G.Z. Wang ◽  
S.T. Tu ◽  
F.Z. Xuan
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Welded Joints ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Creep Crack Growth Rate ◽  
Material Constraints

Specimen Orientation and Constraint Effects on the Creep Crack Growth Behaviour of 316H Stainless Steel

2012 ◽  
Author(s):  
A. Mehmanparast ◽  
C. M. Davies ◽  
D. W. Dean ◽  
K. M. Nikbin
Keyword(s):  
Stainless Steel ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Compact Tension ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Uniaxial Creep ◽  
Microstructural Effects ◽  
Specimen Orientation ◽  
Constraint Effects

Pre-compression (PC) is found to have strong effects on the tensile, uniaxial creep rupture and creep crack growth (CCG) behaviour of type 316H stainless steel at 550 °C. In this work, blocks of 316H steel have been pre-compressed to 8% plastic strain at room temperature and compact tension, C(T), specimens are extracted from the pre-strained blocks with loading directions parallel and normal to the PC axis. The influence of specimen orientation and thickness on the CCG behaviour of the PC material is examined. The results are compared to short term and long term CCG behaviour of 316H steel at the same temperature. Higher CCG rates and shorter CCI times have been found in PC material with a loading direction normal to the PC axis compared to that parallel to the PC axis. These observations are discussed with respect to the microstructural effects.

Specimen Geometry Effects on Creep Crack Initiation and Growth in Parent Materials and Weldments

2011 ◽  
Author(s):  
Catrin M. Davies ◽  
Robert C. Wimpory ◽  
David W. Dean ◽  
Kamran M. Nikbin
Keyword(s):  
High Temperature ◽  
Crack Initiation ◽  
Crack Growth ◽  
Creep Crack Growth ◽  
Parent Material ◽  
Crack Growth Behaviour ◽  
Creep Crack ◽  
Significant Difference ◽  
Constraint Effects

High temperature crack growth in weldments is of great practical concern in high temperature plant components. Cracking typically occurs in the heat affected zone (HAZ) and often propagates into adjacent parent material (PM). Recently, the importance of constraint effects on creep crack growth behaviour has been recognised and creep crack growth testing on a range of specimen geometries has been performed. Experimental crack growth testing has been performed at 550 °C on a range of fracture specimens using sections taken from a non-stress-relieved 316 steel weldment. These specimens include the compact tension, C(T), middle tension, M(T) and circumferentially cracked bar, CCB, geometries. Results are presented from two long-term creep crack growth (CCG) tests performed on M(T) weldment specimens and these are compared with available data on C(T) and CCB weldment specimens together with both long and short term tests on parent material for a range of specimen geometries. The creep crack initiation (CCI) and growth (CCG) behaviour from these tests has been analysed in terms of the C* parameter. As high levels of residual stress exist in non-stress-relieved weldments, the residual stresses remaining in the weldment specimens have therefore been quantified using the neutron diffraction technique. Long-term (low-load) tests are required on PM specimen to observe specimen constraint effects in 316 steel at 550 °C. When interpreted in terms of the C* parameter the CCG behavior of PM and Weldment materials follow the same trendline on low constraint geometries. However, significant difference is observed in the CCG behavior of PM and weldments on the high constraint C(T) geometry. Long term tests on C(T) specimen weldments are required to confirm the results found.

Creep crack growth properties of P91 and P22 welded joints

2017 ◽  
Vol 40 (8) ◽  
pp. 1267-1275 ◽  
Author(s):  
A. Sedmak ◽  
M. Swei ◽  
B. Petrovski
Keyword(s):  
Crack Growth ◽  
Welded Joints ◽  
Creep Crack Growth ◽  
Creep Crack ◽  
Growth Properties
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