Low velocity impact and compression after impact simulation of thin ply laminates

impact-CAI-composites-amade-soto

Low velocity impact and compression after impact simulation of thin ply laminates

The paper Low velocity impact and compression after impact simulation of thin ply laminates by Soto et al., published in the 109 issue of the Composites Part A journal describes how a new methodology to perform LVI and CAI numerical tests has been proven accurate and efficient for thin ply laminates. From experimental data, a FE model combining shell elements with zero-thickness cohesive elements and including smeared damage was able to give more than acceptable results. The numerical study indicates that matrix cracking effects could be assumed negligible. After damage initiation, delamination and fiber breakage propagate until a last stage which is mainly governed by fiber breakage. Besides, the importance of the fiber constitutive law shape for accurate predictions has been higlighted. The outcome of the study calls for more research in securing the robustness of the model.

 

CAI simulation

 

LVI simulation

 

Paper information

Title Low velocity impact and compression after impact simulation of thin ply laminates
Authors: A. Soto, E.V. González, P. Maimí, F. Martín de la Escalera, J.R. Sainz de Aja, E. Alvarez.
Journal, Volume, Page, Year: Composites Part A 109 (2018) 413–427
DOI:

https://doi.org/10.1016/j.compositesa.2018.03.017

 

Highlights

  • A variable cyclic displacement test methodology applied to MMB is presented.
  • The linear region of the crack growth rate curve is explored in one single test.
  • The approach is applicable to any mode mixity.
  • The crack length is monitored using a dynamic compliance calibration procedure.
  • The testing effort, in terms of time and required material, is reduced.

 

Project and Finding

Supported by ERA-Net AirTN 01/2012, under the project “Damage tolerance for thin ply textile composites (DAMTEX)” and the Spanish Government through the Ministerio de Economía y Competitividad, under contracts MAT2013-46749-R and MAT2015-69491-C3-1-R and the predoctoral grant BES-2014-070374.