How free-edge effects impede CTE determination for composite laminates

Non-linear analysis of free-edge effects in composite laminates subjected to axial loads

International Journal of Non-Linear Mechanics ◽

10.1016/0020-7462(92)90020-8 ◽

1992 ◽

Vol 27 (1) ◽

pp. 27-41 ◽

Cited By ~ 9

Author(s):

Q. Gu ◽

J.N. Reddy

Keyword(s):

Edge Effects ◽

Composite Laminates ◽

Free Edge ◽

Linear Analysis ◽

Axial Loads ◽

Non Linear

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Free-Edge Effects in Composite Laminates

Applied Mechanics Reviews ◽

10.1115/1.2777169 ◽

2007 ◽

Vol 60 (5) ◽

pp. 217-245 ◽

Cited By ~ 80

Author(s):

Christian Mittelstedt ◽

Wilfried Becker

Keyword(s):

Stress Concentration ◽

Edge Effect ◽

Edge Effects ◽

Composite Laminates ◽

Relevant Literature ◽

Free Edge ◽

Experimental Investigations ◽

Singular Stress ◽

Concentration Problem ◽

Concentration Phenomena

There are many technical applications in the field of lightweight construction as, for example, in aerospace engineering, where stress concentration phenomena play an important role in the design of layered structural elements (so-called laminates) consisting of plies of fiber reinforced plastics or other materials. A well known stress concentration problem rich in research tradition is the so-called free-edge effect. Mainly explained by the mismatch of the elastic material properties between two adjacent dissimilar laminate layers, the free-edge effect is characterized by the concentrated occurrence of three-dimensional and singular stress fields at the free edges in the interfaces between two layers of composite laminates. In the present contribution, a survey on relevant literature from more than three decades of scientific research on free-edge effects is given. The cited references date back to 1967 and deal with approximate closed-form analyses, as well as numerical investigations by the finite element method, the finite difference method, and several other numerical techniques. The progress in research on the stress singularities which arise is also reviewed, and references on experimental investigations are cited. Related problems are also briefly addressed. The paper closes with concluding remarks and an outlook on future investigations. In all, 292 references are included.

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Progressive Damage Analyses of Composite Laminates Exhibiting Free Edge Effects Using a New Micro-Meso Approach

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.471-472.263 ◽

2011 ◽

Vol 471-472 ◽

pp. 263-267

Author(s):

Hossein Hosseini-Toudeshky ◽

Amin Farrokhabadi ◽

Bijan Mohammadi

Keyword(s):

Edge Effects ◽

Composite Laminates ◽

Free Edge ◽

Experimental Results ◽

Progressive Damage ◽

Stress Strain ◽

Laminate Thickness ◽

Stress Variations ◽

Angle Ply Laminates ◽

Free Edges

In this paper, the developed new micro-meso method by the authors is used for the edge-effects analyses of various angle-ply laminates such as [10/-10]2s and [30/-30]2s. It is shown that the obtained stress-strain behaviors of laminates are in well agreement with the available experimental results. The stress variations through the laminate thickness and near the free edges are also computed and compared with the available CDM results.

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