Abstract:

　A n engineering app roach is developed fo r the residual st rength analysis of damaged,specially impacted, lam inated compo sites. Themain features of the app roach are ① an independent damage characterizat ion method, Damage Data St ructure, DDS, ② a N ew failure criterion ——Damage Influence (D I) criterion fo r no tched specimen, ③ a simp le model, BendingSt rain Energy Density (BSED ) , fo r impact damage p redict ion, ④ an algo rithm of residualst rength analysis fo r single and o rmult ip le delam inat ions, either int roduced by impact o r p reimp lanted. The app licability and effect iveness of th is app roach w ere validated by numerical analysis fo r no tched tension, comp ression of impacted and p reimp lanted delam inat ion, fo r 52 different layup s and of material system s. Good consistency of analysis results w ith test results isobtained.

Key words: laminated composites, damage, strength