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Fracture analysis of the battery cans for Implantable Pulse Generators

SIMULIA's picture

The stresses in a battery housing used in Implantable Pulse Generators (IPGs), also known as pacemakers, were investigated using Abaqus/Standard. There were three levels of analysis: the global level, the three-dimensional submodel level and the plane strain submodel level. The output of the global analysis was fed into the three-dimensional submodel analysis and subsequently the output of the three-dimensional submodel analysis was fed into the plane strain submodel analysis. The simulation results of the global model were used to drive the more detailed three-dimensional submodels on long and short sides of the battery models. The material properties of the heat affected zone and fusion zone were incorporated into the more detailed three-dimensional submodels. The geometry for the battery housing was also enhanced in the three-dimensional submodel. From the three-dimensional submodel analyses, the displacements of several key points were recorded and imposed on the plane strain submodels. The plane strain submodel included details of the notches, whereas the three-dimensional submodels did not. Ultimately, the finite-strain fracture analyses were conducted on the plane strain submodels and J-integral values were extracted. The J-integral results on the long and short sides were compared and it was found that the J-integral values on the long-side are higher than the corresponding values on the short-side. This was consistent with the experimental observations.

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