• Title/Summary/Keyword: CHILE(Cure Hardening Instantaneously Linear Elastic)

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Prediction of Spring-in of Curved Laminated Composite Structure (굴곡 형상 복합재 구조물의 스프링-인 예측)

  • Oh, Jae-Min;Kim, Wie-Dae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.43 no.1
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    • pp.1-7
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    • 2015
  • This paper predicts the spring-in effect of curved laminated composite structure for various stacking sequence using finite element analysis(ABAQUS). In composite manufacturing process, large temperature difference, different coefficient of thermal expansion and chemical shrinkage effect cause distortion of composite parts such as spring-in and warpage. Distortion of composite structure is important issue on quality of product, and it should be considered in manufacturing process. In finite element analysis, a CHILE(Cure Hardening Instantaneously Linear Elastic) model and chemical shrinkage effects are considered developing user subroutine in ABAQUS and some cases are simulated.

Thermal Deformation Analysis of L-shaped Composite During Cure Process by Viscoelastic Model (점탄성을 고려한 L-형상 복합재료 성형시 열변형 해석)

  • Seong, Dong-Yun;Kim, Wie-Dae
    • Composites Research
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    • v.33 no.4
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    • pp.220-227
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    • 2020
  • When curing the composite, the fibers have little thermal deformation, but the resin changes its properties with time and temperature, which leads to residual stress in the product. Residual stress is caused by the difference in the coefficient of thermal expansion of the fibers and resin during the curing process and the chemical shrinkage of the resin. This difference causes thermal deformation such as spring-in and warpage. Thermal deformation of composite structure is important issue on quality of product, and it should be considered in manufacturing process. In this study, a subroutine was developed to predict thermal deformation by applying 3-D viscoelastic model. The finite element analysis was verified by comparing the results of the plate analysis of the 2-D viscoelastic model. Spring-in of L-shaped structure was predicted and analyzed by applying the 3-D viscoelastic model.