[논문]Prediction of Deterioration Rate for Composite Material by Moisture Absorption

Kim, Yun-Hae; An, Seung-Jun; Jo, Young-Dae; Bae, Chang-Won; Moon, Kyung-Man

doi:10.5916/jkosme.2010.34.2.296

Prediction of Deterioration Rate for Composite Material by Moisture Absorption 원문보기

한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering, v.34 no.2, 2010년, pp.296 - 302

Kim, Yun-Hae (Department of Marine equipment Engineering, Korea Maritime University) , An, Seung-Jun (Department of Marine equipment Engineering, Korea Maritime University) , Jo, Young-Dae (Department of Marine equipment Engineering, Korea Maritime University) , Bae, Chang-Won (Engineering Education Team, Korea Institute of Maritime and Fisheries Technology) , Moon, Kyung-Man (Department of Materials Engineering, Korea Maritime University)

Abstract ▼ AI-Helper

If the fiber reinforced plastic is exposed to the moisture for a long period of time, most of moisture absorption occurs on the resin place, thus dropping cohesiveness between the molecules as the water molecules permeated between high molecular chains grant high molecular mobility and flexibility. Also as the micro crack occurs due to the permeation of moisture on the interface of glass fiber and epoxy resin, it is developed to the overall damage of interface place. Hence, the study on absorption is essential as the mechanical and physical properties of fiber reinforced composites are reduced. However, the study on absorption has the inconvenience needing to expose composite materials to fresh water or seawater for 1 month or up to 1 year. Therefore, this study has exposed fiber reinforced composites to fresh water and has developed a model with an accuracy of 98% after comparing the analysis value obtained by using ANSYS while basing on the experimental value of property decline by absorption and the basic properties of glass fiber and epoxy resin used in the experiment.

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문제 정의

This study has checked the durability when the fiber reinforced composites were exposed to moisture and has analyzed the property deterioration of composite materials by absorption using ANSYS a finite element analysis program. This is a study on the possibility of a model that can predict the tensile strength behavior of composite materials by absorption in a short period of time through the comparisons of experimental value and analysis value.

제안 방법

The influence of moisture permeated within the resin can be recovered through drying but the influence by micro crack cannot be recovered by drying. Accordingly in order to compare the resulting value of experiment with the result of finite element method (FEM), this study has only considered reduction in the strength that can not be recovered by drying and has applied only the micro crack in modeling. The specimen used in this experiment was sufficiently dried upon absorption.
Hence, it is not easy to estimate reduction in the material property by the absorption of each material. Accordingly, this study has prepared the GE (Glass/Epoxy) prepreg and CE(Carbon/Epoxy) prepreg specimens and has observed the mechanical properties of specimens by dipping them in the distilled water of 80℃ for 10 days that show a sudden absorption of moisture as shown in the papers on absorption. Also by modeling micro crack from the interface by absorption while using ANSYS an application program of finite elements method, we have compared the test value and analysis value in order to suggest the possibility of developing a model that can predict reduction in the strength of composite materials by absorption in a short period of time.
This study has checked the durability when the fiber reinforced composites were exposed to moisture and has analyzed the property deterioration of composite materials by absorption using ANSYS a finite element analysis program. This is a study on the possibility of a model that can predict the tensile strength behavior of composite materials by absorption in a short period of time through the comparisons of experimental value and analysis value.

이론/모형

In order to predict reduction in the strength of fiber reinforced composite materials by absorption, this study has used ANSYS 11.0 an application program of finite elements method.

성능/효과

424% as compared to that of CE. If the analysis value obtained in this way is compared with the experimental value obtained through this test, the GE prepreg and CE prepreg hold the respective error values of 1.52% and 1.424%.
The comparison values of GE prepreg and CE prepreg have shown the accuracy of 98.48% and 98.58% respectively and this could be regarded as a very accurate model. Although it is very difficult to tell the accuracy only with two comparison values, this study has checked possibility of the study.

참고문헌 (11)

Y.H. Kim, and S.J. An, "A study on the composite blade performance variation by attaching erosion shield for hovercraft", Journal of the Korean Society of Marine Engineering, vol.33, no.7, pp. 1017-1025, 2009.

원문보기 상세보기
Y.H. Kim, an Y.D. Jo, "The evaluation of mechanical properties and physical properties of the Hanji reinforced composites", ICMDT2009, Jeju Island, Korea June 25-26, pp. 25, 2009.
Y.H. Kim, and K.J. Kim, "A study on degradation and recovery mechanisms of composites under the moisture environment", The Korean Society for Composite Materials, pp.1-7, 2008.
W. Schnabel, Polymer Degradation: Principles and Practical Application, Hansa International, Germany, 1981.
D. M. Pinkerton, The Prevention of the Deterioration of Organic Materials in Operational. Environment, Report TTCP.AUSP3/15 The Technical Corporation Program, 1975.
C. H. Shen and G. S. Springer, "Effect of moisture and temperature materials", Journal of Composite Materials, pp2-16, 1997.
K.J. Kim, "A study on the mechanism of moisture absorption with the analysis of physical and mechanical propertiesto the fiber reinforced super-light composite", doctoral thesis graduate school of Korea Maritime University 2007.
S. Y. Bae, A Study on the Optimum Design of Autonomous Underwater Vehicle by Fiber-reinforced Composites, Master Thesis, Graduate School Korea Maritime University, 2009.
S. H. Song, C. W. Kim, The mixture ratio effect of epoxy resin, curing agentand accelerator on the fatigue behavior of FRMLs, Korean Journal of The Korean society of mechanical engineers, vol.25, no.5, pp.592-601, 2001.
A. Kelly and C. Zweben, "Comprehensive composite materials", Polymer Matrix Composites, vol. 2, pp. 4-11, 2000.
Y.H. Kim, and S.Y. Bae, "Structural design and analysis of autonomous underwater vehicle by fiber reinforced plastics", Korean Journal of The Korean society of mechanical engineers, vol.32, no.11, pp.937-942, 2008.

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DOI : 10.5916/jkosme.2010.34.2.296 [무료]
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