No abstract

No abstract

No abstract

The spatial and temporal distributions of the transient stresses generated in elastically deformable bodies with the elastic properties of zinc selenide, polymethylmethacrylate, and soda-lime glass have been evaluated for an idealized representation of a water drop impacting a plane surface. The development of regions of significant tensile stresses within the target material is clearly shown which can be related to fracture initiation in brittle materials. The analytical approach used has its inherent shortcomings which include the lack of obtaining the stresses at the surface in the vicinity of the Rayleigh wave front and the fact that it is only applicable to the earliest stages of the impact event before lateral outflow dominates. However, the idealized model reasonably approximates the results from numerical analyses with regard to the water drop shape profile in the initial stage of the impact when the compressibility of the water in the drop is most significant. It does appear that the period of the collision covered by the analysis is where the damage within the material originates, whether due to the deformations within the impact zone or by the transient stress distribution established after the passage of the shear wave into the target material.