Derivation of Ply Specific Stiffness Parameters of Fiber Reinforced Polymer Laminates via Inverse Solution of Classical Laminate Theory

  • László Kovács eCon Engineering Ltd., Budapest, Hungary; Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Hungary
  • Gábor Romhány Department of Polymer Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Hungary

Abstract

The realistic estimation of the ply stiffness parameters of polymer composite laminates is a big challenge nowadays in industrial practice.
In this paper a new, innovative concept is introduced that is based on the backward use of Classical Laminate Theory (CLT). The innovation in this new concept is (amongst others): possibility to infer the stiffness constants from the simple mechanical tests of specimens with multidirectional ply stack-up identical to the part to design. In addition the new method is manifested in a form of a compact equation that surely returns the measured deformation of the tested specimen on laminate level. The mathematical background of this concept is slightly more complex than what the conventional techniques offer, however its explicit form allows to code it in any automatic systems (e.g. user script) that can be run in Finite Element environment or as part of the software of a mechanical testing frame.

Keywords: stiffness, CLT, orthotropic, mechanical test, composite laminate
Published online
2018-03-10
How to Cite
Kovács, L. and Romhány, G. (2018) “Derivation of Ply Specific Stiffness Parameters of Fiber Reinforced Polymer Laminates via Inverse Solution of Classical Laminate Theory”, Periodica Polytechnica Mechanical Engineering, 62(2), pp. 158-164. doi: https://doi.org/10.3311/PPme.11846.
Section
Articles