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기술보고서 게시판 내용
타이틀	Simulation of Complex Cracking in Plain Weave C/SiC Composite under Biaxial Loading
저자	Cheng, Ron-Bin;; Hsu, Su-Yuen
Keyword	BRITTLENESS;; CERAMIC MATRIX COMPOSITES;; COHESION;; CRACK INITIATION;; CYCLIC LOADS;; DAMAGE ASSESSMENT;; FIBER COMPOSITES;; FINITE ELEMENT METHOD;; INTERLAYERS;; PREDICTIONS;; SIMULATION
URL	http://hdl.handle.net/2060/20120016711
보고서번호	NF1676L-14243
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Finite element analysis is performed on a mesh, based on computed geometry of a plain weave C/SiC composite with assumed internal stacking, to reveal the pattern of internal damage due to biaxial normal cyclic loading. The simulation encompasses intertow matrix cracking, matrix cracking inside the tows, and separation at the tow-intertow matrix and tow-tow interfaces. All these dissipative behaviors are represented by traction-separation cohesive laws. Not aimed at quantitatively predicting the overall stress-strain relation, the simulation, however, does not take the actual process of fiber debonding into account. The fiber tows are represented by a simple rule-of-mixture model where the reinforcing phase is a hypothetical one-dimensional material. Numerical results indicate that for the plain weave C/SiC composite, 1) matrix-crack initiation sites are primarily determined by large intertow matrix voids and interlayer tow-tow contacts, 2) the pattern of internal damage strongly depends on the loading path and initial stress, 3) compressive loading inflicts virtually no damage evolution. KEY WORDS: ceramic matrix composite, plain weave, cohesive model, brittle failure, smeared crack model, progressive damage, meso-mechanical analysis, finite element.