WATERDROP IMPACT MODELING

The complete spatial and temporal interaction of a waterdrop impacting a deformable target can now be described using a three-dimensional finite element model. The advantage of the finite element formulation is that the stresses generated in structurally complex targets can be determined. The geometry of the target is also accurately represented in the model. A brief account of previous waterdrop impact modeling approaches is provided to illustrate the significance of what can be accomplished with the current model. A broad range of constitutive behavior and failure criteria are available within the finite element analysis, however implementation of the finite element analysis depends in many cases on how well the high rate of loading behavior of the components in the target is known. Experimentation to define the relevant material response models is being developed. Currently predictions for the onset of failure are based on the magnitude and duration of the stresses generated within the target. The finite element analysis is being extended to include the propagation of damage and the associated redistribution of stress around the failed elements. It will then be possible to predict the full extent of the damage produced by an arbitrary waterdrop impact.