Analytical model for the prediction of the plastic shear resistance of the panel zone in welded joints

ce/papers ◽  
2021 ◽  
Vol 4 (2-4) ◽  
pp. 995-1005
Author(s):  
Adrien Corman ◽  
Jean‐François Demonceau ◽  
Jean‐Pierre Jaspart
Keyword(s):  
Analytical Model ◽  
Welded Joints ◽  
Shear Resistance ◽  
Plastic Shear ◽  
Panel Zone

Analytical model for the panel zone resistance in welded steel beam-to-column joints

2022 ◽  
Vol 189 ◽  
pp. 107099
Author(s):  
Adrien Corman ◽  
Jean-François Demonceau ◽  
Jean-Pierre Jaspart
Keyword(s):  
Analytical Model ◽  
Steel Beam ◽  
Welded Steel ◽  
Panel Zone

Microscopic mechanism of the effect of composition and topological orders of metal glasses on plastic shear resistance

1997 ◽  
Vol 23 (12) ◽  
pp. 1004-1009 ◽  
Author(s):  
A. S. Bakai ◽  
V. Z. Bengus ◽  
E. D. Tabachnikova ◽  
P. Duhaj
Keyword(s):  
Shear Resistance ◽  
Plastic Shear ◽  
Microscopic Mechanism ◽  
Metal Glasses

Analysis of Fatigue Crack Propagation in Typical Welded Joints of FPSOs

2005 ◽  
Author(s):  
Bin Zhang ◽  
Torgeir Moan
Keyword(s):  
Stress Intensity ◽  
Residual Stresses ◽  
Crack Propagation ◽  
Analytical Model ◽  
Surface Crack ◽  
Welded Joints ◽  
Structural Reliability ◽  
Fatigue Cracks ◽  
Integral Approach ◽  
Initial Surface

The purpose of this paper is to predict crack propagation and especially the remaining life after through-the-thickness crack at typical joints in deck and bottom structures of FPSOs. This information can be used in planning inspection, repair and maintenance. The growth of fatigue cracks is studied in typical welded joints through the use of analytical and numerical methods. The simplified analytical model is based on the British Standard 7910 [3] and Dexter’s analytical model [1–2]. Numerical analysis is performed with the finite element method, considering the effect of residual stresses, and using the J-integral approach to determine the stress intensity factor at the crack tip during different stages of crack growth. The first stage is referred the surface crack stage, in which the crack grows from an initial surface crack of a size of about 0.1 mm in depth and 0.2mm-1.0mm in length to the through-thickness crack. The second stage is named the long crack stage, in which the crack grows from an approximately 40–100mm long through-thickness crack to the final critical long crack. The computed stress intensity factors, along with the Paris law, are used to predict the crack propagation at each stage with reasonable accuracy. The effect of welding residual stresses on fatigue behaviour is considered by introducing an effective SIF concept. It is concluded that stable crack propagation behaviour can be conservatively predicted by using relatively simple approaches. These techniques can be used in making rational decisions regarding scheduling of inspections, repairs, and allow a better prediction of the structural reliability in view of fatigue cracks.

scholarly journals Analytical model for assessing fatigue limit of welded joints of ferritic-pearlitic steels

2020 ◽  
Vol 20 (3) ◽  
pp. 225-234
Author(s):  
K. A. Molokov ◽  
V. V. Novikov ◽  
A. P. German
Keyword(s):  
Crack Length ◽  
Fatigue Limit ◽  
Analytical Model ◽  
Welded Joints ◽  
Endurance Limit ◽  
Crack Tip ◽  
Analytical Dependence ◽  
Critical Crack ◽  
Critical Crack Length ◽  
Grain Diameter

Introduction. Microdefects and zones with stress concentration in welded joints cause fatigue macrocracks. Such damage is potentially dangerous, especially if the fatigue life of the structure is almost exhausted. In this case, the crack size is close to the critical value, and it is crucial to determine its length. The paper considers the development of an engineering analytical model for assessing the critical crack length and endurance limit of welded joints with the formed grain in the structure of ferrite-pearlitic steels after welding. Materials and Methods. The theory and methods of fracture mechanics at the mesoscale are used. A simple analytical dependence is obtained, which provides determining the critical dimensions of a macrocrack for ferrite-pearlite steels without using the Griffiths formula. . The calculation results of the critical crack lengths of various steels depending on their yield strength are presented. An analytical dependence of the endurance limit calculation for the most dangerous symmetric loading cycle, according to the standard set of mechanical characteristics and the average grain diameter of ferrite-pearlite steel, is presented. Results. Structural deformation analysis of the crack propagation process has been performed. On its basis, an engineering technique for assessing the endurance limit is developed. A mathematical model that enables to calculate the endurance limit and the critical crack length in the components of welded assemblies of large-sized facilities, considering periodic loads of a symmetrical cycle, is developed. Using this model, it is possible to estimate the degree of metal sensitivity to the original characteristics (yield stress, Poisson's ratio, grain diameter, relative constriction, Young's modulus, power-law hardening coefficient, etc.).Discussion and Conclusion. Under stresses corresponding to the steel endurance limit, the critical crack opening rates of the tip and edges approach each other. Energetically, this moment approximately corresponds to the transition of the crack to an unstable state. The accumulation of one-sided plastic deformations causes the limiting state of plasticity of the region adjacent to the crack tip and its avalanche-like or sharply accelerated motion. This critical area is interrelated with the grain diameter of the material, the characteristic of critical plasticity and the critical opening at the crack tip at the fatigue limit. The proposed analytical dependences can be used to assess the residual life and the fatigue limit of welded structures, the influence of various factors on the fatigue limit of welded joints of ferrite-pearlitic steels used in mechanical engineering, shipbuilding, pipeline transport, etc

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