Application of laser ultrasonic measurement to verification of ply-by-ply damage modelling of composite laminates subjected to low velocity impact

摘要

One of an available way for damage analysis of composite laminates subjected to low velocity impact is ply-by-ply finite element modelling. A usage of this modelling technique for real composite structural elements requires its experimental verification. At present paper, the application of laser ultrasonic non-destructive method is demonstrated for getting data about impact interlaminar damage as well as initial material state of vacuum infused subcomponent specimens. The FE model simulates impact damage of plates during testing in according with ASTM D7137 framework. The constitutive and damage material model is identified by corresponding coupon test data. The developed models allow analysing of the both intra- and interply damage and failure for prediction of residual strength of the structural elements. The results of the simulation are compared with the impact test and laser-ultrasonic evaluation data through the specimen thickness.