1. Aprocedure for the mathematical definition of bird impact loads has been developed by AFWAL/FIER for use with MAGNA finite element simulations of aipjraft transparency bird impact dyaniic response. This procedure i s based firmly on an extensive experimental data base accumu a e o r a period of several years. 4-6148128 The data base i s valid for the case of a rigid, flat, inclined target and comprises pressure data recorded at the surface of the target during bird impact.
2. Plastic Strain mn.) Procedure for Uncoupled Bird Impaa Loads
3. This procedure for the definition of bird impact loading i s quite simplistic. It presumes a regular aeometry for the bird, ignores spikes of shock pressure which occur very early i n the impact event, and assumes a spatially uniform distribution of pressure. Even with these features, bird impact simulation results obtained with this procpgure have been found to be useful and realistic. The usefulness of uncoupled bird impact loads defined with this procedure i s apparentlimited, however, to glass transparency desions. Procedure for Coupled Bird Impact Loads Definition
4. Listed output from these 7 jobs included three-dimensional stresses and strains at element integration points for the 3 magnesium arch elements Iying against the widshieldcenter 1ine, as well as for the 6 steel tube elements adjoining the windshield centerline. For time increments 41-60, integration point stresses and strains for 8 polycarbonate elements were also listed. These 8 elements were those adjoining the windshield centerline, beginning at the aft edge of the windshield and continuing forward 4 rows, for both the inner and outer structural plies.