Free-edge and ply cracking effect in cross-ply laminated composites under uniform extension and thermal loading

2006 ◽  
Vol 76 (4) ◽  
pp. 314-325 ◽  
Author(s):  
Daxu Zhang ◽  
Jianqiao Ye ◽  
Hong Yu Sheng
Keyword(s):  
Thermal Loading ◽  
Laminated Composites ◽  
Free Edge ◽  
Uniform Extension

A new finite element for free edge effect analysis in laminated composites

2006 ◽  
Vol 84 (22-23) ◽  
pp. 1538-1546 ◽  
Author(s):  
Viet-Tung Nguyen ◽  
Jean-François Caron
Keyword(s):  
Finite Element ◽  
Edge Effect ◽  
Laminated Composites ◽  
Free Edge ◽  
Effect Analysis

Free-edge crack onset induced by thermal loading

2021 ◽  
pp. 111160
Author(s):  
C. Frey ◽  
S. Dölling ◽  
M. Leštáková ◽  
W. Becker
Keyword(s):  
Edge Crack ◽  
Thermal Loading ◽  
Free Edge

On the Logarithmic Singularity of Free-Edge Stress in Laminated Composites Under Uniform Extension

1982 ◽  
Vol 49 (3) ◽  
pp. 561-569 ◽  
Author(s):  
R. I. Zwiers ◽  
T. C. T. Ting ◽  
R. L. Spilker
Keyword(s):  
Boundary Conditions ◽  
Logarithmic Singularity ◽  
Laminated Composite ◽  
Free Edge ◽  
Fiber Direction ◽  
Stacking Sequence ◽  
Type K ◽  
Principal Axes ◽  
Edge Stress ◽  
Uniform Extension

The stress singularities at the free edge of an interface between adjacent layers in a laminated composite are studied. Each layer of the composite is assumed to be of the same orthotropic material with one of the principal axes being the fiber direction. The angle θ, however, which is the fiber orientation, varies from layer to layer. The composite is subjected to uniform extension in the plane of the layers. At the interface between adjacent layers having fiber angles (0/90), (θ/θ′), and a family of special combinations of (θ/θ′) shown in the paper, the singularity of the type k*rδ (δ<0), seems to be the only possibility. For an interface with other combinations of fiber orientations in the the adjacent layers, it is shown that an additional singularity of the form k(ln r) exists. Since the constant k* depends on the stacking sequence of the layers and the complete boundary conditions, and may vanish in some cases, the existence of a k*rδ singularity at a free edge is not certain until a complete problem is solved. In contrast, the constant k, which is called the logarithmic stress-intensity factor, is independent of the stacking sequence of the layers and the complete boundary conditions. Its value is determined once the fiber orientations on both sides of the interface are known. Therefore, at the interface between adjacent layers for which k≠0, the free-edge stress is inherently singular. Moreover, the singularity is logarithmic.

Sign in / Sign up

Export Citation Format

Share Document