Details
| Original language | English |
|---|---|
| Pages (from-to) | 1537-1545 |
| Number of pages | 9 |
| Journal | Computers and Structures |
| Volume | 83 |
| Issue number | 19-20 |
| Publication status | Published - 12 Apr 2005 |
| Externally published | Yes |
Abstract
For efficiently simulating the impact behavior of sandwich structures made from composite face sheets and a lightweight core a rapid and accurate 3D stress analysis is essential. For that reason, a three-layered finite element formulation based on plane stress assumptions was recently developed by Kärger et al. [Kärger, WA, Rolfes R, Rohwer K. A three-layered sandwich element with improved transverse shear stiffness and stress based on FSDT. Comput Struct, submitted for publication]. It has turned out, however, that under concentrated out-of-plane loads this element formulation lacks appropriate accuracy of stress results. Therefore, an improved finite element formulation is developed, which accounts for the full 3D stress state. In a post-processing routine, the transverse stresses are improved by using the Extended 2D Method, which was developed by Rolfes and Rohwer [Rolfes R, Rohwer K. Improved transverse shear stresses in composite finite elements based on first order shear deformation theory. Int J Numer Meth Eng 1997;40:51-60] and extended to a three-layered sandwich structure by Kärger et al. Both the finite element formulation by Kärger et al. and the new formulation presented in the present article use pure displacement approaches and require only C0-continuity conditions, which simplifies integration into existing FE codes and allows combined application with other finite elements. Two examples demonstrate the accuracy and applicability of the two elements.
Keywords
- 3D stress analysis, Composite, Layered shell element, Sandwich
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- Engineering(all)
- Mechanical Engineering
- Computer Science(all)
- Computer Science Applications
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In: Computers and Structures, Vol. 83, No. 19-20, 12.04.2005, p. 1537-1545.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Evaluation of two finite element formulations for a rapid 3D stress analysis of sandwich structures
AU - Wetzel, A.
AU - Kärger, L.
AU - Rolfes, R.
AU - Rohwer, K.
PY - 2005/4/12
Y1 - 2005/4/12
N2 - For efficiently simulating the impact behavior of sandwich structures made from composite face sheets and a lightweight core a rapid and accurate 3D stress analysis is essential. For that reason, a three-layered finite element formulation based on plane stress assumptions was recently developed by Kärger et al. [Kärger, WA, Rolfes R, Rohwer K. A three-layered sandwich element with improved transverse shear stiffness and stress based on FSDT. Comput Struct, submitted for publication]. It has turned out, however, that under concentrated out-of-plane loads this element formulation lacks appropriate accuracy of stress results. Therefore, an improved finite element formulation is developed, which accounts for the full 3D stress state. In a post-processing routine, the transverse stresses are improved by using the Extended 2D Method, which was developed by Rolfes and Rohwer [Rolfes R, Rohwer K. Improved transverse shear stresses in composite finite elements based on first order shear deformation theory. Int J Numer Meth Eng 1997;40:51-60] and extended to a three-layered sandwich structure by Kärger et al. Both the finite element formulation by Kärger et al. and the new formulation presented in the present article use pure displacement approaches and require only C0-continuity conditions, which simplifies integration into existing FE codes and allows combined application with other finite elements. Two examples demonstrate the accuracy and applicability of the two elements.
AB - For efficiently simulating the impact behavior of sandwich structures made from composite face sheets and a lightweight core a rapid and accurate 3D stress analysis is essential. For that reason, a three-layered finite element formulation based on plane stress assumptions was recently developed by Kärger et al. [Kärger, WA, Rolfes R, Rohwer K. A three-layered sandwich element with improved transverse shear stiffness and stress based on FSDT. Comput Struct, submitted for publication]. It has turned out, however, that under concentrated out-of-plane loads this element formulation lacks appropriate accuracy of stress results. Therefore, an improved finite element formulation is developed, which accounts for the full 3D stress state. In a post-processing routine, the transverse stresses are improved by using the Extended 2D Method, which was developed by Rolfes and Rohwer [Rolfes R, Rohwer K. Improved transverse shear stresses in composite finite elements based on first order shear deformation theory. Int J Numer Meth Eng 1997;40:51-60] and extended to a three-layered sandwich structure by Kärger et al. Both the finite element formulation by Kärger et al. and the new formulation presented in the present article use pure displacement approaches and require only C0-continuity conditions, which simplifies integration into existing FE codes and allows combined application with other finite elements. Two examples demonstrate the accuracy and applicability of the two elements.
KW - 3D stress analysis
KW - Composite
KW - Layered shell element
KW - Sandwich
UR - http://www.scopus.com/inward/record.url?scp=19944389879&partnerID=8YFLogxK
U2 - 10.1016/j.compstruc.2005.02.005
DO - 10.1016/j.compstruc.2005.02.005
M3 - Article
AN - SCOPUS:19944389879
VL - 83
SP - 1537
EP - 1545
JO - Computers and Structures
JF - Computers and Structures
SN - 0045-7949
IS - 19-20
ER -