Unsymmetrical stacking sequences as a novel approach to tailor damage resistance under out-of-plane impact loading

aravind-amade-impact-composites

Unsymmetrical stacking sequences as a novel approach to tailor damage resistance under out-of-plane impact loading

It can be said that it is common wisdom that laminates must be symmetric. However, in some special cases, the use of unsymmetrical laminates can be of advantage when the load cases induce unevenly distributed stresses. This recent contribution by AMADE members has explored this novel possibility with an unsymmetrical laminate with zero extension-bending coupling matrix. Two specimen types (unsymmetrical laminate with ply clustering at the impacted face and a laminate with ply clustering at the non-impacted face) have been tested with impact and quasi-static indentation tests, C-scan inspection , correlated to numerical simulations. The results show that the laminate with clusters at the impacted side exhibits better damage resistance for lower impact energies.
You can find more in the March issue (num. 173) of Composites Science and Technology.

 

Paper information

Title Unsymmetrical stacking sequences as a novel approach to tailor damage resistance under out-of-plane impact loading
Authors: A.Sasikumar; J.Costa; D.Trias; E.V. González; S.M. García-Rodríguez; P. Maimí

Journal, Volume, Page, Year: Composites Science and Technology, 125-135, 173, 2019
DOI:

https://doi.org/10.1016/j.compscitech.2019.02.002

 

Highlights

  • Unsymmetrical warp free laminates were designed using optimization techniques.
  • Laminate design can be used to tailor damage in a laminate under out of plane loading.
  • Using experimental and numerical techniques, we compared the damage sequences between two proposed unsymmetrical laminates.
  • The possibility to relax symmetry constraints in laminate design is demonstrated.

 

Project and Funding

  • Funding institutions: Generalitat de Catalunya for the FI-DGR pre-doctoral grant (2017 FI-B1 00089); Spanish Ministerio de Economía y Competitividad for the grant coded MAT2015-69491-C3-1-R