Damage Including Incision Stiffened Composite Plates Extended Numerical Simulation And Repair Performance Analysis

We should consider the influence of damage in the battlefield for the airplane which is designed for viability. This article gives the subsistent ability and the analysis result of intensity after repair in the open field airplane composite material structure by research the intensity , rigid and repair problem under a axis compress loads on a typical three stiffened composite laminate which has a penetrability crack (a scatter damage)by a shrapnel. The main research is below:(1) the influence to intensity and rigid with corner angle(60, 75 and 90 degree) of crack and the board axes(2) do a FEM stress/strain and crack growth simulation analysis when the corner angle of crack and the board axes is 60 degree(3) do a intensity resume analysis for the structure which is repaired with a Titanium patch in a mechanical way when the corner angle of crack and the board axes is 60 degreeThrough simulation analysis for three failure criterion, We have:(1) In 60°, damage extend quickly with damage analysis in Hashin criterion; it is slower for analysis in Maximum Stress or Hashin-Rotem criterion.(2) In special term (physical condition incision, shape or maximum load)the compression strength of the stiffened plate will decline 45%~50% under compression loads.(3) The strength can suffice the wartime request under the loads with the mechanical connection repair which mentioned in the article.