Data processing: structural design – modeling – simulation – and em – Modeling by mathematical expression
Reexamination Certificate
2000-09-21
2004-09-07
Knight, Anthony (Department: 2121)
Data processing: structural design, modeling, simulation, and em
Modeling by mathematical expression
C703S007000, C706S915000, C219S117100
Reexamination Certificate
active
06789051
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to a method and apparatus for modeling a welding process and, more particularly, to a method and apparatus for integrating models for a welding process to perform a thermal and structural analysis of the process.
BACKGROUND ART
The process of welding materials has some amount of detrimental effect on the materials being welded. For example, materials being welded are subjected to residual stresses and distortions due to the extreme heat caused by the weld process.
In the past, attempts have been made to analyze and determine the effects of heat on materials from the welding process. One method in particular, the finite element method (FEM), uses finite element analysis to model the weld process, and has been widely used to analyze the thermal effects of welding. However, FEM can be extremely cumbersome to implement and very costly.
Another method used to determine the effects of heat on materials from the welding process incorporates an analytical solution to determine the thermal history of the welding process. For example, analytical solutions have been developed which use the superposition of point heat source solutions. These methods generally do not require the extremely cumbersome finite element analysis techniques previously used, and therefore provide a much more rapid analytical solution procedure. However, analytical methods do not account for such features as weld joint geometry. Furthermore, it may be desired to use both types of thermal models for some applications. For example, an analytical based model may be used for providing rapid, global solutions, and the FEM may be used to provide accurate temperature models for local areas of concern.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a method for providing a simulation of a welding process using integrated models is disclosed. The method includes the steps of determining a model of a geometry of a set of materials to be welded, defining a set of coordinates of elements and nodes of the geometry model for a finite element analysis mesh, delivering the finite element analysis mesh coordinates to a thermal analysis model, the thermal analysis model including an analytical solution model and a finite element analysis model, and determining a thermal analysis of the welding process, the thermal analysis responsively providing a thermal history of the welding process. The method further includes the steps of delivering the thermal history of the welding process to a structural analysis model, and providing a structural analysis of the welding process as a function of the thermal history.
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Chen Xiao
Dong Yi
Nanjundan Ashok
Barnes Crystal J.
Caterpillar Inc
Knight Anthony
Lundquist Steve D
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