Influence of crack arresting rib on the fracture characteristic of integral wing-spar

摘要

Focus on the problem that fracture characteristic of integral structure is worse than composite structure, this paper studied the influence of anti-crack rib design parameters on the fracture characteristic of integral wing-spar through calculating the stress intensity factor and constructing support vector machine agent model. Results indicated that crack arresting rib could enhance the fracture characteristic of integral wing-spar well. When crack extended to crack arresting rib, residual strength of integral wing-spar will enhance for about 36%, crack growth life enhance about 13.5%; the best location of crack arresting rib is at 1/3 the height of wing-spar. Conclusions gained could provide reference for damage tolerance design of integral wing-spar.