Welded Connection Analysis


Introduction

This tutorial describes the steps needed to analyze cracking in a model of a weld connection using FRANC3D V6.0 and ABAQUS V6.11.1. This tutorial does not describe how to build the ABAQUS model of the weld connection; but images of the model and some of the *Tie constraints are provided for reference. Note that we maintain all the *Part/*Instance/*Assembly information during the fracture simulation process.

Illustrating the ABAQUS Model of a Weld Connection

The ABAQUS model of the simple welded connection is shown in Figure 1. Two plates are welded together. The model is composed of the following parts: flange, frame, bottom weld, and the top weld. The top weld is broken into three pieces and the central portion of the top weld will be extracted from ABAQUS for use with FRANC3D. Global and local portions of the mesh are defined, Figure 2, and .inp files are written for each portion. Various parts of the model are held together using ABAQUS’s *Tie constraints. Figure 3 shows some of the surfaces that are involved; the welds are tied to the column (as well as the flange) – left image in Figure 3. The top weld is made of three pieces that are tied together – right image in Figure 3.

Figure 1. ABAQUS model of a simple weld connection.


Figure 2. ABAQUS global and local models of a simple weld connection.


Figure 3. ABAQUS *Tie constraint surfaces for a simple weld connection.

Once the two .inp files have been exported from ABAQUS, we can proceed with the fracture analysis using FRANC3D.

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