Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

Estimation of Young's and Shear Moduli of a Core in ISB Panel with Woven Metal as Inner Structures

망형 직조 금속을 내부구조체로 가진 ISB 판재의 심재 종탄성 및 전단 계수 예측

  • Ahn, Dong-Gyu (Department of Mechanical Engineering, Chosun Univ.) ;
  • Nam, Gyung-Heum (Department of Mechanical Engineering, Graduate School, Chosun Univ.) ;
  • Jung, Chang-Gyun (Automotive Steel Applications Research Group, Technical Research Lab. POSCO) ;
  • Yang, Dong-Yol (Department of Mechanical Engineering, KAIST)
  • 안동규 (조선대학교 기계공학과) ;
  • 남경흠 (조선대학교 일반대학원 기계공학과) ;
  • 정창균 (포스코 기술연구원 자동차가공연구그룹) ;
  • 양동열 (KAIST 기계공학과)
  • Published : 2009.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

The elastic properties of core affect mechanical properties and deformation behaviours of the lightweight sandwich panel. The objective of the present paper is to estimate experimentally Young's and shear moduli of a core in internally structured boned (ISB) panel with woven metal as inner structures using the deflection theory of sandwich beam considered core stiffness. Three points bending experiments were performed to obtain force-deflection curves of the designed ISB panel in each material direction. The elastic and shear moduli of the core in each material direction were estimated from slopes and intercepts of relationships between compliance per the span length and square of the span length, respectively. The results of the estimation showed that the fabric technology of the woven metal affects the variation of the elastic properties in the core. Through the comparison of shear moduli and force-deflection curves of the proposed method and those without considering the core stiffness, it was shown that the core stiffness should be considered to estimate properly the Young's and shear moduli of ISB panels. Finally, the contribution ratio of bending and shear deflections of ISB panels to the total deflection was quantitatively examined.

Keywords

References

  1. Fuganti, A., Lorenzi, L., Hanssen, A. G. and Langseth, M., "Aluminum Foam for Automotive Applications," Advanced Engineering Materials, Vol. 2, No. 4, pp. 200-204, 2000 https://doi.org/10.1002/(SICI)1527-2648(200004)2:4<200::AID-ADEM200>3.0.CO;2-2
  2. Evans, A. G., Hutchison, M. F. and Ashby, M. F., "Multifunctionality of Cellular Metal Systems," Progress in Materials Science, Vol. 43, No. 3, pp. 171-221, 1999 https://doi.org/10.1016/S0079-6425(98)00004-8
  3. Dear, J. P., Lee, H. and Brown, S. A., "Impact Damage Processes in Composite Sheet and Sandwich Honeycomb Materials," International Journal of Impact Engineering, Vol. 32, No. 1-4, pp. 130-154, 2005 https://doi.org/10.1016/j.ijimpeng.2005.02.005
  4. Wadly, H. N. G., Fleck, N. A. and Evans, A. G., "Fabrication and Structural Performance of Periodic Cellular Metal Sandwich Structures," Composites Science and Technology, Vol. 63, No. 16, pp. 2331-2343, 2003 https://doi.org/10.1016/S0266-3538(03)00266-5
  5. Rathbun, H. J., Zok, F. W. and Evans, A. G., "Strength Optimization of Metallic Sandwich Panels Subjected to Bending," International Journal of Solids and Structures, Vol. 42, No. 26, pp. 6643-6661, 2005 https://doi.org/10.1016/j.ijsolstr.2005.06.044
  6. Jung, C. G., Yoon, S. J., Yang, D. Y., Lee, S. M., Na, S. J., Lee, S. H. and Ahn, D. G., "Fabrication and Static Bending Test in Ultra Light Inner Structured and Bonded (ISB) Panel Containing Repeated Inner Pyramidal Structure," Journal of the Korean Society for Precision Engineering, Vol. 22, No. 6, pp. 175-182, 2005
  7. Ahn, D. G., Lee, S. H., Jung, C. G., Hahn, G. Y. and Yang, D. Y., "Mechanical Properties and Failure Characteristics of ISB Panel with Metallic Pyramidal Inner Structures," Journal of Materials Processing Technology, Vol. 187-188, pp. 521-525, 2007 https://doi.org/10.1016/j.jmatprotec.2006.11.191
  8. Styles, M., Compston, P. and Kalyanasundaram, S., "The Effect of Core Thickness on the Flexible Behaviour of Aluminum Foam Sandwich Structures," Composite Structures, Vol. 80, No. 4, pp. 532-538, 2007 https://doi.org/10.1016/j.compstruct.2006.07.002
  9. Hazizan, M. A. and Cantwell, W. J., "The Low Velocity Impact Response of an Aluminum Honeycomb Sandwich Structures," Composites Part B: Engineering, Vol. 34, No. 8, pp. 679-687, 2003 https://doi.org/10.1016/S1359-8368(03)00089-1
  10. Jung, C. G., Seong, D. Y., Yang, D. Y., Moon, K. J. and Ahn, D. G., "Experimental Investigation of Shear Modulus of a Core in a Metallic Sandwich Plate with a Truss Core," Journal of the Korean Society for Precision Engineering, Vol. 24, No. 8, pp. 67-73, 2007
  11. Neal, B. G., "Analysis and Design of Structural Sandwich Panels," Pergamon Press, pp. 8-14, 1969
  12. Jung, C. G., Yoon, S. G., Yang, D. Y., Lee, S. M., Na, S. J., Lee, S. H. and Ahn, D. G., "Basic Study in Fabrication and Mechanical Characteristics of Ultra Light Inner Structured and Bonded (ISB) Panel Containing Perpendicularly Woven Metal," Journal of the Korean Society for Precision Engineering, Vol. 22,No. 5, pp. 152-158, 2005
  13. Seong, D. Y., Jung, C. G., Yoon, S. J., Yang, D. Y., Lee, S. H. and Ahn, D. G., "Fabrication of Metallic Sandwich Plates with Inner Dimpled Shell Structure and Static Bending Test," Transactions of the Korean Society of Mechanical Engineers, Vol. 30, No. 6, pp. 653-661, 2006 https://doi.org/10.3795/KSME-A.2006.30.6.653