scholarly journals Effect Range of the Material Constraint-II. Interface Crack

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 696 ◽  
Author(s):  
Yue Dai ◽  
Jie Yang ◽  
Lei Wang
Keyword(s):  
Interface Crack ◽  
Welded Joints ◽  
Integrity Assessment ◽  
Center Crack ◽  
Fracture Behaviors ◽  
Selection Of ◽  
Material Constraints

The selection of fracture behaviors used in the structure integrity assessment has significant implications on the accuracy of the assessment. The effect range of the material constraint is an important factor which effects the fracture behaviors of structures and exists in the different kinds of welded joints with the center crack. However, for the material constraint induced by an interface crack, which also appears widely in the welded joints, it is not clear whether the effect range exists or not. The further study of the effect range of the material constraint for the welded joints with interface crack is meaningful. Thus, in this study, different basic models with interface crack were designed, the fracture behaviors of these basic models under different material constraints were calculated, and the effect range of the material constraint induced by interface crack were studied. This study about the interface crack and the previous study about the center crack provide an additional basis for an accurate structure integrity assessment.

scholarly journals Effect Range of the Material Constraint-I. Center Crack

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 67 ◽  
Author(s):  
Jie Yang ◽  
Lei Wang
Keyword(s):  
Welded Joints ◽  
Fracture Behavior ◽  
Solid Mechanics ◽  
Adjacent Area ◽  
Strain Fields ◽  
Integrity Assessment ◽  
Center Crack ◽  
Design Structure ◽  
Resistance Curves ◽  
Material Constraints

Material constraints are important factor effects on the fracture behavior of welded joints. The effect range of the material constraint is an important and interesting issue which needs to be clarified, including whether the effect range of a material constraint exists or not, who will affect it, and whether the material constraint is affected by the no adjacent area or not. In this study, different basic models which reflect different single metallic welded joints, bimetallic welded joints and dissimilar metal welded joints were designed, and the fracture resistance curves and crack tip strain fields of the different models with various material constraints were calculated. Based on the results, the questions above were answered. This study has significance for developing solid mechanics, optimizing joint design, structure integrity assessment, and so on.

scholarly journals Prediction and Selection of the Best Process Parameters to Improve Toughness of Mild Steel Welded Joints

OALib ◽  
2021 ◽  
Vol 08 (08) ◽  
pp. 1-9
Author(s):  
Larry M. Ebhota ◽  
Osamede Osarobo Ogbeide ◽  
Innocent Uduehi Abhulimen
Keyword(s):  
Mild Steel ◽  
Process Parameters ◽  
Welded Joints ◽  
Selection Of

On the Constraint-Based Failure Assessment of Surface Cracks in T-Plate Welded Joints

2003 ◽  
Author(s):  
X. Wang ◽  
R. Bell ◽  
S. B. Lambert
Keyword(s):  
Lower Bound ◽  
Welded Joints ◽  
Structural Integrity ◽  
Constraint Effect ◽  
Engineering Structures ◽  
Integrity Assessment ◽  
Failure Assessment ◽  
Recent Developments ◽  
Failure Predictions ◽  
Crack Tip Constraint

The loss of crack tip constraint leads to enhanced resistance to both cleavage and ductile tearing. However, conventional failure assessment schemes (CEGB-R6, BS-7910) use lower bound toughness obtained from highly constrained test specimens. Cracks in many real engineering structures are not highly constrained, which makes failure predictions using conventional failure assessment schemes based on lower bound fracture toughness values overly pessimistic. Excessive pessimism in the structural assessment can lead to unwarranted repair or decommissioning of structures, and thus cause unneeded cost and inconvenience. Recent developments on constraint-based fracture mechanics have enabled the practical assessment of defective components including the constraint effect. For example, the recent revision of R6 and the newly developed structural integrity assessment procedures for European industry (SINTAP) have suggested a framework for failure assessments including the constraint effect. In this paper, the constraint-based failure assessment of surface cracked T-plate welded joints under tension load is presented. Different issues including the constraint-based failure assessment diagrams, the treatment of combining primary and the secondary loads, and the calculation of stress intensity factors, limit loads and constraint parameters for surface cracked T-plate joints are discussed. It is demonstrated that when the lower constraint effect is properly accounted for, the maximum allowable tensile stress level increases substantially.

scholarly journals Selection of modes of high-temperature tempering of heat-resistant steel welded joints made by electrodes thermanit MTS616

2016 ◽  
Vol 2016 (9) ◽  
pp. 47-50
Author(s):  
V.Yu. Skulsky ◽  
◽  
A.K. Tsaryuk ◽  
A.R. Gavrik ◽  
M.A. Nimko ◽  
...  
Keyword(s):  
High Temperature ◽  
Welded Joints ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Selection Of

scholarly journals Selection of PAUT probes for submarine pressure hull integrity assessment

2020 ◽  
Vol 12 ◽  
pp. 578-595
Author(s):  
Min-jae Jung ◽  
Byeong-cheol Park ◽  
Chae-og Lim ◽  
Jae-chul Lee ◽  
Sung-chul Shin
Keyword(s):  
Integrity Assessment ◽  
Selection Of

scholarly journals Oscillatory Singularity Behaviors Near Interface Crack Tip for Mode II of Orthotropic Bimaterial

2013 ◽  
Vol 2013 ◽  
pp. 1-9
Author(s):  
Xiaomei Yang ◽  
Weiyang Yang ◽  
Junlin Li ◽  
Xuexia Zhang
Keyword(s):  
Interface Crack ◽  
Linear Independence ◽  
Linear Equations ◽  
Crack Tip ◽  
Analytic Solutions ◽  
Mode Ii ◽  
Crack Tip Field ◽  
Fracture Behaviors ◽  
Stress Functions ◽  
Singularity Exponent

The fracture behaviors near the interface crack tip for mode II of orthotropic bimaterial are discussed. The oscillatory singularity fields are researched. The stress functions are chosen which contain twelve undetermined coefficients and an unknown singularity exponent. Based on the boundary conditions and linear independence, the system of twelve nonhomogeneous linear equations is derived. According to the condition for the system of nonhomogeneous linear equations which has a solution, the singularity exponent is determined. Total coefficients are found by means of successive elimination of the unknowns. The theoretical formulae of stress intensity factors and analytic solutions of stress field near the interface crack tip are obtained. The crack tip field is shown by figures.

scholarly journals Tension fracture behaviors of welded joints in X70 steel pipeline

2011 ◽  
Vol 1 (3) ◽  
pp. 031008 ◽  
Author(s):  
Dejun Kong ◽  
Yongzhong Wu ◽  
Dan Long ◽  
Chaozheng Zhou
Keyword(s):  
Welded Joints ◽  
Steel Pipeline ◽  
Fracture Behaviors ◽  
Tension Fracture

Correlation of Fracture Toughness With Charpy Impact Energy for Low Alloy, Structural Steel Welds

2017 ◽  
Author(s):  
Kleber E. Bianchi ◽  
Vitor Scarabeli Barbosa ◽  
Rafael Savioli ◽  
Paulo Eduardo Alves Fernandes ◽  
Claudio Ruggieri
Keyword(s):  
Fracture Toughness ◽  
Impact Energy ◽  
Welded Joints ◽  
Structural Integrity ◽  
Charpy Impact ◽  
Reference Temperature ◽  
Transition Curve ◽  
Charpy Impact Energy ◽  
Integrity Assessment ◽  
Steel Welds

Correlations between Charpy impact energy and fracture toughness values have continuously been developed because of their applicability in structural integrity assessment methodologies. This also applies to the integrity analysis of welded joints, which represent material discontinuities and potential failure locus in structures. Therefore, in effective FFS methodology applications, the fracture toughness of welded joints located in critical regions should be accurately estimated. This work addresses an estimation procedure of fracture toughness values based on Charpy impact energy for low alloy, steel welds made from an ASTM A572 Gr 50 base plate material. To produce the welded joints, two processes were used: SMAW and FCAW. To ensure valid toughness test values corresponding to high constraint conditions, a strength overmatched, deeply-cracked SE(B) configuration having a weld centerline notch was adopted. The ductile-to-brittle transition curve was established by means of Charpy tests. Direct CVN correlations with fracture toughness, as well as reference temperature based correlations derived from the Master Curve approach, were evaluated. The obtained results indicate that both correlation procedures are suitable for weld metal toughness estimations based on Charpy data. However, slightly different values of correlation constants than those indicated for the base metal should be employed in the case of the reference temperature method.

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