Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
권호 표지
DOI QR코드

DOI QR Code

Development of Criteria for Predicting Delamination in Cabinet Walls of Household Refrigerators

냉장고 캐비닛 벽면에서 발생하는 박리현상 예측을 위한 평가 기준 개발에 관한 연구

  • Park, Jin Seong (Dept. of Mechanical Engineering, National Korea Maritime & Ocean University) ;
  • Kim, Sung Ik (Dept. of Mechanical Engineering, National Korea Maritime & Ocean University) ;
  • Lee, Gun Yup (Advanced Technology 1Team, LG Electronics) ;
  • Cho, Jong Rae (Dept. of Mechanical Engineering, National Korea Maritime & Ocean University)
  • Received : 2021.10.25
  • Accepted : 2022.01.28
  • Published : 2022.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

Household refrigerator cabinets must undergo cyclic testing at -20 ℃ and 65 ℃ for quality control (QC) after their production is complete. These cabinets were assembled from different materials, including acrylonitrile butadiene styrene (ABS), polyurethane (PU) foam, and steel plates. However, different thermal expansion values could be observed owing to differences in the mechanical properties of the materials. In this study, a technique to predict delamination on a refrigerator wall caused by thermal deformation was developed. The mechanical properties of ABS and PU foams were tested, theload factors causing delamination were analyzed, delamination was observed using a high-speed camera, and comparison and verification in terms of stress and strain were performed using a finite element model (FEM). The results indicated that the delamination phenomenon of a refrigerator wall can be defined in two cases. A method for predicting and evaluating delamination was established and applied in an actual refrigerator. To determine the effect of temperature changes on the refrigerator, strain measurements were performed at the weak point and the stress was calculated. The results showed that the proposed FEM prediction technique can be used as a basis for virtual testing to replace future QC testing, thus saving time and cost.

Keywords

Acknowledgement

This research was funded by LG Electronics Co., Ltd., the Ministry of Education's National Research Foundation, and the BK21 project.

References

  1. Kim, J. K., Roh C. G., Kim, H. and Jeong, J. H. "An experimental and numerical study on an inherent capacity modulated linear compressor for home refrigerators," International Journal of Refrigeration, Vol. 34, pp. 1415-1423, 2011. https://doi.org/10.1016/j.ijrefrig.2011.04.011
  2. Park, J. K., "Optimization of Heat Insulation System for a Household Refrigerator," Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 15, No. 2, pp. 95-103, 2003.
  3. Choa, C. S., Choi E. H., Choa, J. R. and Lima, O. K., "Topology and parameter optimization of a foaming jig reinforcement structure by the response surface method," Computer-Aided Design, Vol. 43, pp. 1707-1716, 2011. https://doi.org/10.1016/j.cad.2011.08.008
  4. Baek, J. M., Won, J. R., Lee B. H. and Kim, J. H., "A study on contribution to UNFCCC caused by reinforcement of efficiency standard for residental refrigerators," The Korean Institute of Electrical Engineers, pp. 226-228, 2008.
  5. Jeong, G. E., Kang, P., Youn, S. K., Yeo, I., Song, T. H., Kim, J. O., Kim, D. W. and Kuk, K., "Study of Structural Stiffness of Refrigerator Cabinet Using the Topology Optimization of a Vacuum Insulated Panel (VIP)," Journal of the Korean Society for Precision Engineering, Vol. 32, No. 8, pp. 727-734, 2015. https://doi.org/10.7736/KSPE.2015.32.8.727
  6. Yang, W. J., Lee, G. Y. and Park, S. H., "Analysis on Chemical and Physical Behaviors of Polyurethane Foam for Prediction of Deformation of Refrigerator Panels," International Journal of Precision Engineering and Manufacturing, Vol. 20, pp. 2041-2049, 2019. https://doi.org/10.1007/s12541-019-00159-0
  7. Cho, J. R., Kwak, G. Y. and Jung, J. H., "A Study on the Deformation near Duct of Refrigerator Cabinet," The Korea Society of Mechanical Engineers, pp. 250-253, 2008.
  8. Zhai, J., Cho, J. R., Jeon, W. J. and Kim, J. H., "The Study for Bead Effect in Inner Case on Thermal Deformation of Refrigerator," Journal of the Korean Society for Precision Engineering, Vol. 28, No. 1, 96-101, 2011.
  9. Mills, N. J., "Polymer Foams Handbook," Elsevier, pp. 86-107, 2007.
  10. ASTM D624-14, "Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers," 2014.
  11. Fishback, T. L., Reichel, C. J. and Lee, T. B., "Polyol composition having good flow and water blown rigid polyurethane foams made thereby having good dimensional stability," US Patent, No. 5686500, 1997.
  12. Landrock, A. H., "Handbook of Plastic Foam; Types, Properties, Manufacture and Applications," United States of America by Noycs PubIications, pp. 11-15, 1995.
  13. Saint-Michel, F., Chazeau, L., Cavaille, J. Y. and Chabert, E. "Mechanical properties of high density polyurethane foams: I. Effect of the density," Composites Science and Technology, Vol. 66, pp. 2700-2708, 2006. https://doi.org/10.1016/j.compscitech.2006.03.009
  14. Gama, N. V., Ferreira, A. and Barros-Timmons, A., "Polyurethane Foams: Past, Present, and Future," Materials, Vol., 11, No. 10, p. 1841, 2018. https://doi.org/10.3390/ma11101841