16108

Multi Fracture/Delamination Analysis of Composites Subjected to Impact Loadings

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A combined finite/ discrete element method is presented for modelling composite specimens subjeded to dynamic/impact loadings. The main task is set on developing an algorithm for simulation of potential bonding and debonding/delarnination phenomena during impact or qenera! dynamic loading conditions. In addition. full fracture lIיf1alysis also be pcrjormed. The proposed approach. adopts a general node to face nonlinear jrictiouo) contact algorithm to enforce bonding/debonding constraints btJwern composite plies. The method i8 also capable of analyzinq progressive [racturc and .!jYtgnwntrdion beluunour as well as potential post cracking interactions caused [ry the newly created r:raek sides and scqnicn:«. A loud rettieslusu; teciuiiqne is adopted every time a new crack is [ormed. uihil»: an onerall remeshing is performed aruitinu: a certain criterion of (:,(7"OT estimation is violated. The special local retnesliitu; tecluuque is de.,i.i]ncd to qcoinetricallsj model ILTI individurd crack by sp/dting the dement. sepmnting the failed node. crcatin.1f tieu. nodes and dividing the nciqhbornu; clemenis to preserne the eornpatibllity corulitions. The same procedure יis capable oj modelling opplieation of jibrc rein/o1"(;((1 !JOlyllUT (FRP) layerיs to other en.gineering structures in order to unprorc their fie:rible bciuiuior in static «nd dimamu: loadinq contlitiou».

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