국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Progressive Damage Analysis of Bonded Composite Joints
저자	Leone, Frank A., Jr.;; Girolamo, Donato;; Davila, Carlos G.
Keyword	ADHESIVE BONDING;; BONDED JOINTS;; DAMAGE;; DAMAGE ASSESSMENT;; DELAMINATING;; EPOXY MATRIX COMPOSITES;; FAILURE;; FRACTURING;; HONEYCOMB STRUCTURES;; LOADS (FORCES); SANDWICH STRUCTURES
URL	http://hdl.handle.net/2060/20130000531
보고서번호	NASA/TM-2012-217790
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The present work is related to the development and application of progressive damage modeling techniques to bonded joint technology. The joint designs studied in this work include a conventional composite splice joint and a NASA-patented durable redundant joint. Both designs involve honeycomb sandwich structures with carbon/epoxy facesheets joined using adhesively bonded doublers.Progressive damage modeling allows for the prediction of the initiation and evolution of damage within a structure. For structures that include multiple material systems, such as the joint designs under consideration, the number of potential failure mechanisms that must be accounted for drastically increases the complexity of the analyses. Potential failure mechanisms include fiber fracture, intraply matrix cracking, delamination, core crushing, adhesive failure, and their interactions. The bonded joints were modeled using highly parametric, explicitly solved finite element models, with damage modeling implemented via custom user-written subroutines. Each ply was discretely meshed using three-dimensional solid elements. Layers of cohesive elements were included between each ply to account for the possibility of delaminations and were used to model the adhesive layers forming the joint. Good correlation with experimental results was achieved both in terms of load-displacement history and the predicted failure mechanism(s).