TEST VALIDATION ON THE ENERGY ABSORPTION BEHAVIOR OF COMPOSITE TUBES WITH DIFFERENT PLY ARCHITECTURES

摘要

Crush simulations are performed using the explicit FEA capabilities of MD Nastran SOL 700with a micromechanics-based PFA constitutive model, GENOA, implemented as a materiallibrary known as MATM. Available experimental data on quasi-static crush tests are used tovalidate the numerical predictions of tape, fabric and tape/fabric material systems made of sameconstituent materials. The FE model obtains the stresses based on the micromechanics basedmaterial stiffness at the ply level, and compared with the micromechanically based calculatedstrength. This methodology is valid until any damage or failure is observed in the material. Asthe material meets the failure mode the associated degradation factors affect the stiffnessproperties. The woven fabric is modeled by dividing the thickness of the cross-ply layers in halfand treating them as separate unidirectional layers. The material properties that are defined at themicro level are defined in the Advanced Composite option (MATM) of MD Nastran. The presentstudy provided a consistent strategy to successfully study the crushing behavior of the tubes in avariety of layups.