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Conti­nuum Damage Models for Relia­bi­lity Assess­ment of Struc­tu­ral Composites

Zalikha Murni Abdul Hamid – Hector Fellow Peter Gumbsch

Der Bedarf an Kohle­fa­ser-/Epoxid-Verbund­struk­tu­ren wächst aufgrund ihrer Vorteile für die Indus­trie stetig an. Ziel des Projekts ist es, den Verschleiß- und Versa­gens­pro­zess von diesen Verbund­struk­tu­ren zu beobach­ten und darauf basie­rend ein hochkom­ple­xes Compu­ter­mo­dell zu entwi­ckeln, das das Verfor­men und Versa­gen von Materia­lien im Voraus berech­nen kann.

The market’s demand for carbon fiber/epoxy compo­site has drama­ti­cally incre­a­sed due to its signi­fi­cant appli­ca­ti­ons and advan­ta­ges in indus­try. Typical loading on the struc­tures that are made up by this material often invol­ves tensile and lateral bending of the compo­site lamina­tes. These include transi­ent and fatigue loading. Carbon fiber/epoxy compo­site struc­tures under applied loading will undergo several damages and fracture modes such as matrix yielding, matrix cracking, fiber pull-out, fiber fracture, inter-ply delami­na­tion or fiber/matrix inter­face debonding.

These damages may appear indivi­du­ally or inter­act collec­tively, which can later lead to catastro­phic struc­ture failure. Thus, relia­bi­lity assess­ment of the carbon fiber/epoxy compo­site struc­ture is absolutely criti­cal, taking into account the damage initia­tion, damage propa­ga­tion and final failure. Further­more, the versa­ti­lity of the materi­als that are explo­i­ted under higher stress and strains justi­fies the need for more reliable data.

The project super­vi­sed by Hector Fellow Peter Gumbsch aims to identify the dominant damage mecha­nisms in carbon fiber/epoxy compo­site struc­tures and their inter­ac­tions under static and cyclic condi­ti­ons. It aims, in parti­cu­lar, at defining the inter­ac­tion effects between the neigh­bo­ring lamina­tes. Apart from that, the project also aims to deter­mine the mecha­nism and to observe the pheno­me­non of inter-ply failure during the failure process of carbon fiber/epoxy compo­site lamina­tes. The study should result in a propo­sed model to predict damage and failure modes that evolve within carbon fiber/epoxy compo­site. This model is expec­ted to be able to predict the relia­bi­lity of the carbon fiber/epoxy compo­site under both monoto­nic and fatigue loading.

RR Lyrae stars as tracers of substructure and Galactic archaeology

Combi­ned fiber, matrix and inter­face failure modes

Zalikha Murni Abdul Hamid

Karls­ru­her Insti­tut für Technologie
   

Betreut durch

Prof. Dr.

Peter Gumbsch

Ingenieur­we­sen

Hector Fellow seit 2008Disziplinen Peter Gumbsch