Property degradation of anisotropic composite laminates with matrix cracking (I)— Constitutive relation developing for (θ m /90 n ), cracked laminates by stiffness partition

1998 ◽  
Vol 19 (3) ◽  
pp. 279-287 ◽  
Author(s):  
Hua Yu ◽  
Wang Xingguo ◽  
Li Zhengneng
Keyword(s):  
Constitutive Relation ◽  
Composite Laminates ◽  
Matrix Cracking ◽  
Anisotropic Composite ◽  
Stiffness Partition

Property Degradation of Anisotropic Composite Laminates with Matrix Cracking. Part 1: Development of Constitutive Relations for (θm/90n)s Cracked Laminates by Stiffness Partition

1996 ◽  
Vol 15 (11) ◽  
pp. 1149-1160 ◽  
Author(s):  
Hua Yu ◽  
Wang Xingguo ◽  
Li Zhengneng ◽  
He Qingzhi
Keyword(s):  
Composite Laminates ◽  
Constitutive Relations ◽  
Crack Density ◽  
Matrix Cracking ◽  
Normal Response ◽  
Shear Response ◽  
Plane Normal ◽  
Anisotropic Composite ◽  
Stiffness Partition

The study on property degradation of damaged composite laminates is extended to anisotropic laminates with matrix cracking. In Part 1 of the paper, an idea of “stiffness partition” is proposed to deal with the puzzle that the in-plane normal response is coupled with the shear response of the laminates. For (θ m/90 n), laminates containing transversely cracked layers under general in-plane loading, the constitutive relations are derived and the effective stiffnesses are expressed as the functions of crack density.

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.

scholarly journals Modelling Strategies for Simulating Delamination and Matrix Cracking in Composite Laminates

2014 ◽  
Vol 22 (4) ◽  
pp. 377-403 ◽  
Author(s):  
Frederic Lachaud ◽  
Christine Espinosa ◽  
Laurent Michel ◽  
Pierre Rahme ◽  
Robert Piquet
Keyword(s):  
Composite Laminates ◽  
Matrix Cracking ◽  
Modelling Strategies
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