Ultimate strength prediction of braided textile composites using a multi-scale approach

Title
Ultimate strength prediction of braided textile composites using a multi-scale approach
Author
하성규
Keywords
Braided textile composites; micromechanics; progressive damage; ultimate strength prediction
Issue Date
2015-01
Publisher
SAGE PUBLICATIONS LTD
Citation
JOURNAL OF COMPOSITE MATERIALS, v. 49, Page. 477-494
Abstract
In this paper, the strength of braided textile composites is predicted using a multi-scale approach bridging the mesoscale and microscale regimes. Mesoscale finite element models of representative unit cells of biaxial and triaxial braided composites are developed for predicting strength. The constituent stresses of tows inside the braided unit cell are calculated using micromechanics. Correlations between mesoscale stresses and microscale constituent stresses are established by using stress amplification factors. After calculating microscale stresses, a micromechanics-based progressive damage model is employed to determine the damage statuses of braided composites. A volume-averaging homogenization method is utilized to eliminate damage localization in the matrix of tows, and a parametric study is performed to evaluate the effects of damage homogenization. Subsequently, the ultimate strength is predicted for braided composites in which the braiding angle ranges from 15 degrees to 75 degrees. The prediction results are compared with the experimental values, and good agreement is observed.
URI
http://hdl.handle.net/20.500.11754/21396http://journals.sagepub.com/doi/10.1177/0021998314521062
ISSN
0021-9983
DOI
10.1177/0021998314521062
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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