Comment to the paper ‘Analysis of Progressive Matrix Cracking in Composite Laminates II. First Ply Failure’ by George J Dvorak and Norman Laws

2013 ◽  
Vol 48 (9) ◽  
pp. 1139-1141 ◽  
Author(s):  
P Maimí ◽  
EV González ◽  
PP Camanho
Keyword(s):  
Composite Laminates ◽  
Paper Analysis ◽  
Matrix Cracking ◽  
Progressive Matrix

scholarly journals Progressive Matrix Cracking in Composite Laminates Loaded in Tension

1992 ◽  
Vol 1 (1) ◽  
pp. 096369359200100 ◽  
Author(s):  
J Zhang ◽  
J Fan ◽  
C Soutis
Keyword(s):  
Experimental Data ◽  
Theoretical Model ◽  
Crack Initiation ◽  
Composite Laminates ◽  
Matrix Cracking ◽  
Shear Lag ◽  
Simple Theoretical Model ◽  
Stiffness Properties ◽  
Progressive Matrix ◽  
Good Agreement

The reduction of stiffness properties due to transverse ply cracking in [μθ m/90 n] s laminates loaded in quasi-tension is examined theoretically. Predictions of a simple theoretical model based on a modified 2-D shear-lag analysis, are in good agreement with experimental data. The energy released as a result of matrix cracking is also calculated and used to predict crack initiation and multiplication.

A progressive analysis of matrix cracking-induced delamination in composite laminates using an advanced phantom node method

2016 ◽  
Vol 51 (20) ◽  
pp. 2933-2947 ◽  
Author(s):  
Johannes Reiner ◽  
Martin Veidt ◽  
Matthew Dargusch ◽  
Lutz Gross
Keyword(s):  
Composite Laminates ◽  
Crack Density ◽  
Matrix Crack ◽  
Matrix Cracking ◽  
Geometrically Nonlinear Analysis ◽  
Stiffness Reduction ◽  
Crack Tips ◽  
New Formulation ◽  
Phantom Node Method ◽  
Progressive Matrix

Matrix cracking-induced delamination in composite laminates is qualitatively and quantitatively investigated in a finite element framework. The phantom node method is extended to incorporate breakable interfaces at transverse matrix crack tips. New user-defined element types in Abaqus improve the numerical stability in a geometrically nonlinear analysis. The new formulation allows for accurate prediction of matrix crack density and stiffness reduction in a number of composite laminates. Furthermore, the advanced phantom node method is able to simulate progressive matrix cracking-induced delamination with good accuracy.

Numerical Investigation of a Stiffened Panel Subjected to Low Velocity Impacts

2015 ◽  
Vol 665 ◽  
pp. 277-280 ◽  
Author(s):  
Aniello Riccio ◽  
S. Saputo ◽  
A. Sellitto ◽  
A. Raimondo ◽  
R. Ricchiuto
Keyword(s):  
Numerical Investigation ◽  
Composite Laminates ◽  
Mechanical Response ◽  
Numerical Study ◽  
Fem Analysis ◽  
Matrix Cracking ◽  
Stiffened Panel ◽  
Low Velocity ◽  
Formation And Evolution ◽  
The Impact

The investigation of fiber-reinforced composite laminates mechanical response under impact loads can be very difficult due to simultaneous failure phenomena. Indeed, as a consequence of low velocity impacts, intra-laminar damage as fiber and matrix cracking and inter-laminar damage, such as delamination, often take place concurrently, leading to significant reductions in terms of strength and stability for composite structure. In this paper a numerical study is proposed which, by means of non-linear explicit FEM analysis, aims to completely characterize the composite reinforced laminates damage under low velocity impacts. The numerical investigation allowed to obtain an exhaustive insight on the different phases of the impact event considering the damage formation and evolution. Five different impact locations with the same impact energy are taken into account to investigate the influence on the onset and growth of damage.

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