Sensitivity Analysis for Dynamic Failure, Damage and Distortions in Welded Metallic Structures

The objective of the proposed study is to develop effective computational strategies for: a) assessing the sensitivity of the dynamic failure, damage and distortions of welded metallic structures to variations in the microstructure, macrostructure material and weld process parameters; and b) incorporating the uncertainties in material and weld process parameters in the prediction of response and damage of these structures. The sensitivity coefficients, which are the derivatives of the various structural response quantities with respect to the material parameters, will be evaluated by using the direct differentiation method.

A two-phase computational procedure will be applied to the uncertainty analysis of dynamic failure, damage and distortions in welded metallic structures. In the first phase the sensitivity analysis is used to identify the major material and weld process parameters, i.e., the parameters which have the most impact on the response and failure. In the second phase, the major parameters are treated as fuzzy parameters, and the fuzzy set techniques are used to provide information about the range of variation of possible response quantities and damage associated with pre-selected ranges of variations of the major parameter. In this study, the thermomechanical analysis is performed by using the ABAQUS commercial software code.