MICRO MECHANICS BASED PROGNOSIS OF PROGRESSIVE DYNAMIC DAMAGE IN ADVANCED AEROSPACE COMPOSITE STRUCTURES

摘要

Analysis of advanced composites hasrnsignificantly improved in recent years, leadingrnto their successful integration into primaryrnaerospace structures. This has been broughtrnabout by improvements in computationalrnmethodologies, primarily finite element (FE)rnanalysis methods. However, there are particularrndifficulties associated with prediction ofrndelamination using current FE approaches. Thernintricate architecture of fibres and matrix at thern'micro' level often cannot be captured withrnconventional FE techniques. Therefore, there isrna growing interest in applying micro-mechanicsrnbased constitutive modelling techniques tornpredict damage in advanced composites.rnMicro/macro-mechanics approach has shownrnexcellent accuracy and efficiency in comparisonrnwith common FE methodologies. Thisrninvestigation aims to study and comparerndelamination prediction in a low-energy impactrnscenario in FE versus micro-mechanics basedrnconstitutive modelling platforms. It will bernargued that through using constitutivernmodelling, the precision of the analysis willrnsignificantly increase without intensiverncalibration efforts. This form of modelling canrnrather easily be implemented into design andrncertification analyses of future advancedrnaerospace composite structural concepts.