국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Modification of a Macromechanical Finite-Element Based Model for Impact Analysis of Triaxially-Braided Composites
저자	Goldberg, Robert K.;; Blinzler, Brina J.;; Binienda, Wieslaw K.
Keyword	BRAIDED COMPOSITES;; COMPUTATIONAL MECHANICS;; FINITE ELEMENT METHOD;; IMPACT DAMAGE;; IMPACT TESTS;; MATHEMATICAL MODELS;; MICROMECHANICS;; POLYMER MATRIX COMPOSITES;; STIFFNESS
URL	http://hdl.handle.net/2060/20110003081
보고서번호	NASA/TM-2010-216922
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	A macro level finite element-based model has been developed to simulate the mechanical and impact response of triaxially-braided polymer matrix composites. In the analytical model, the triaxial braid architecture is simulated by using four parallel shell elements, each of which is modeled as a laminated composite. For the current analytical approach, each shell element is considered to be a smeared homogeneous material. The commercial transient dynamic finite element code LS-DYNA is used to conduct the simulations, and a continuum damage mechanics model internal to LS-DYNA is used as the material constitutive model. The constitutive model requires stiffness and strength properties of an equivalent unidirectional composite. Simplified micromechanics methods are used to determine the equivalent stiffness properties, and results from coupon level tests on the braided composite are utilized to back out the required strength properties. Simulations of quasi-static coupon tests of several representative braided composites are conducted to demonstrate the correlation of the model. Impact simulations of a represented braided composites are conducted to demonstrate the capability of the model to predict the penetration velocity and damage patterns obtained experimentally.