Asymptotic thermal and residual stress distributions due to transient thermal loads

The paper deals with the development of thermal and residual stress distributions arising from the solidification of a fusion zone near a V-notch tip. A set of numerical solutions of the problem was carried out under the hypothesis of generalized plane strain conditions by means of SYSWELD code. The intensity of the thermal and residual asymptotic stress fields at the sharp V-notch tip was studied for a given V-notch specimen geometry and a predefined fusion zone dimension after simulations on materials with different thermal, mechanical and phase transformation properties and after changing the clamping conditions at the specimen's boundary. The results were compared in terms of the elastic or elastic-plastic notch stress intensity factors giving a contribution to the interpretation of the experimental behaviour of welded joint.

[1]  T R Gurney,et al.  The Fatigue Strength of Transverse Fillet Welded Joints , 1991 .

[2]  Paolo Lazzarin,et al.  A NOTCH INTENSITY FACTOR APPROACH TO THE STRESS ANALYSIS OF WELDS , 1998 .

[3]  G. Meneghetti,et al.  Fatigue strength of fillet welded structural steels: finite elements, strain gauges and reality , 2001 .

[4]  Paolo Lazzarin,et al.  Notch stress intensity factors and fatigue strength of aluminium and steel welded joints , 2001 .

[5]  Yves Verreman,et al.  Early development of fatigue cracking at manual fillet welds , 1996 .

[6]  John W. Hutchinson,et al.  Singular behaviour at the end of a tensile crack in a hardening material , 1968 .

[7]  Paolo Lazzarin,et al.  From a local stress approach to fracture mechanics: a comprehensive evaluation of the fatigue strength of welded joints , 1999 .

[8]  Guy Pluvinage,et al.  The use of notch stress intensity factor as a fatigue crack initiation parameter , 1995 .

[9]  Wolfgang Fricke,et al.  Fatigue analysis of welded joints: state of development , 2003 .

[10]  Nikolaos Aravas,et al.  Determination of higher-order terms in asymptotic elastoplastic crack tip solutions , 1991 .

[11]  M. Williams,et al.  Stress Singularities Resulting From Various Boundary Conditions in Angular Corners of Plates in Extension , 1952 .

[12]  Antonio Blázquez,et al.  A simplified numerical analysis of residual stresses in aluminum welded plates , 1996 .

[13]  Huang Yuan,et al.  Analysis of elastoplastic sharp notches , 1994 .

[14]  Paolo Lazzarin,et al.  Fatigue strength of steel and aluminium welded joints based on generalised stress intensity factors and local strain energy values , 2005 .

[15]  Bernard Gross,et al.  Plane elastostatic analysis of V-notched plates , 1972 .

[16]  G. Härkegård,et al.  Fatigue life enhancement of aluminium joints through mechanical and thermal prestressing , 2006 .

[17]  D. Radaj,et al.  Review of fatigue strength assessment of nonwelded and welded structures based on local parameters , 1996 .

[18]  M. N. James,et al.  Residual stresses and fatigue performance , 2007 .

[19]  J. Rice,et al.  Plane strain deformation near a crack tip in a power-law hardening material , 1967 .

[20]  Paolo Lazzarin,et al.  The Equivalent Strain Energy Density approach re-formulated and applied to sharp V-shaped notches under localized and generalized plasticity , 2002 .

[21]  Vigilio Fontanari,et al.  Influence of post weld treatments on the fatigue behaviour of Al-alloy welded joints , 1998 .

[22]  Filippo Berto,et al.  Generalized stress intensity factors due to steady and transient thermal loads with applications to welded joints , 2006 .

[23]  Paolo Lazzarin,et al.  A finite-volume-energy based approach to predict the static and fatigue behavior of components with sharp V-shaped notches , 2001 .

[24]  P. Ponte Castañeda,et al.  Asymptotic Fields in Steady Crack Growth with Linear Strain-Hardening, , 1987 .

[25]  Paolo Lazzarin,et al.  Plastic notch stress intensity factors for large V-shaped notches under mixed load conditions , 2001 .

[26]  Plastic stress singularity near the tip of a V-notch , 2000 .

[27]  L. Xia,et al.  Singular behaviour near the tip of a sharp V-notch in a power law hardening material , 1993, International Journal of Fracture.

[28]  Paolo Lazzarin,et al.  A notch stress intensity approach applied to fatigue life predictions of welded joints with different local toe geometry , 2003 .

[29]  Franco Bonollo,et al.  The influence of phase transformations on residual stresses induced by the welding process—3D and 2D numerical models , 2006 .