Numerical Analyses of Soft Body Impacts on Rigid and Deformable Targets.

摘要

A two-dimensional finite difference code, WAVE-L,was used to investigate the impact of soft bodies (birds) on both rigid and deformable targets. The soft body was numerically modeled as a water sphere. Three impact cases were examined:impacts onto rigid targets (both normal and oblique),impact onto a deformable target (a stainless steel disk) and impact onto the edge of a typical jet engine fan blade. For the impacts onto rigid targets the finite difference calculation was used to obtain the pressures produced at impact,the distribution of pressure over the target and the total force exerted on the target. These calculations were compared with experimentally measured values. The impact onto a stainless steel disk was also modeled with the finite difference code. Plate deformation,impact pressures and forces were calculated. The fan blade impacts were modeled in two phases. The impact loading pressures and forces were calculated with the finite difference model. The blade was then modeled with a three dimensional finite element code, NONSAP,using the finite difference pressures on impact. (Author)