Fatigue Damage Analysis Of Welded Structures Based On Continuum
Damage Mechanics
Author(s)
K. Thepvongsa, Y. Sonoda & H. Hikosaka
Abstract
Fatigue damage analysis of welded structures
based on continuum damage mechanics
K. Thepvongsa, Y. Sonoda & H. Hikosaka
Department of Civil Engineering, Kyushu University, Japan
Abstract
In this study, the fatigue damage analysis and life prediction of welded structures
are carried out by using continuum damage mechanics. For high cycle fatigue, it
is considered that plastic deformation and damage occurs at a microscopic scale.
Therefore, a two-scale model presented by Lemaitre is introduced to evaluate the
high cycle fatigue damage evolution. As it is difficult to identify the parameters
directly at the micro scale, the identification method is proposed to obtain the
reliable material parameters for weldment. In order to consider the effect of
residual stress on fatigue behavior of welded joints, the inherent strain method is
applied to determine the residual stress. The analytical results by the proposed
method are compared to experimental results and it is confirmed that the
proposed method
Keywords
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