Details

Autor(en) / Beteiligte

• Edwards, Lyndon
• Smith, Mike C.
• Bendeich, Phillip J.
• Hamelin, Cory J.
• Muránsky, Ondrej

Titel

The Role of Plasticity Theory on the Predicted Residual Stress Field of Weld Structures

Ist Teil von

• Materials science forum, 2013-11, Vol.772, p.65-71

Ort / Verlag

Trans Tech Publications Ltd

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Constitutive plasticity theory is commonly applied to the numerical analysis of welds in one of three ways: using an isotropic hardening model, a kinematic hardening model, or a mixed isotropic-kinematic hardening model. The choice of model is not entirely dependent on its numerical accuracy, however, as a lack of empirical data will often necessitate the use of a specific approach. The present paper seeks to identify the accuracy of each formalism through direct comparison of the predicted and actual post-weld residual stress field developed in a three-pass 316LN stainless steel slot weldment. From these comparisons, it is clear that while the isotropic hardening model tends to noticeably over-predict and the kinematic hardening model slightly under-predict the residual post-weld stress field, the results using a mixed hardening model are quantitatively accurate. Even though the kinematic hardening model generally provides more accurate results when compared to an isotropic hardening formalism, the latter might be a more appealing choice to engineers requiring a conservative design regarding weld residual stress.