Residual-Strength Analysis of Primary Aircraft Structure Damaged Due to Projectile Impact and Penetration. Volume I. Test and Analysis.

摘要

High-strength aluminum channels, damaged by projectile impacts, have been loaded to failure in pure bending. In cases where damage included cracks of significant lengths, failure loads have been compared with those predicted by linear fracture mechanics through a finite-element computer program (CRAKD) which contains special crack-tip stress-singularity elements. CRAKD has been employed for the computation of time-dependent stress-intensity factors in several problems of elastodynamic fracture. The results demonstrate the importance of specimen inertia in impact tests designed for the determination of dynamic fracture toughness. (Author)