Mechanical characteristics and strengthening effectiveness of random-chopped FRP composites containing air voids

Title
Mechanical characteristics and strengthening effectiveness of random-chopped FRP composites containing air voids
Authors
양범주하성국표석훈이행기
Issue Date
2014-06
Publisher
Composites. Part B, Engineering
Citation
VOL 62-166
Abstract
In random-chopped fiber-reinforced polymer (FRP) composites used as a retrofit material, a high volume fraction of voids is inevitable due to the manufacturing characteristics. In this paper, the mechanical characteristics and strengthening effectiveness of random-chopped FRP composites containing air porosity are investigated through experiments and numerical analysis. Coupon-shaped specimens with various material compositions were manufactured to examine the uniaxial tensile performance, and the air voids in the composites were measured by a microscope camera. In order to predict the overall performance of the composites, a micromechanical formulation that accounts for porosity was newly developed. The derived model was incorporated into a finite element (FE) code, and the model parameters were estimated by comparing uniaxial tensile test results for various systems of random-chopped FRP composites. In addition, concrete beams strengthened with the composites were produced to evaluate their load-carrying capacity. The FE predictions of the composite structures were then compared with experimental data to verify the predictive capability of the proposed numerical framework.
URI
http://pubs.kist.re.kr/handle/201004/65331
ISSN
1359-8368
Appears in Collections:
KIST Publication > Article
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