Reduction of free-edge effects around a hole of a composite plate using a numerical layup optimization

2021 ◽  
pp. 115139
Author(s):  
Navid Kharghani ◽  
Christian Mittelstedt
Keyword(s):  
Edge Effects ◽  
Composite Plate ◽  
Free Edge

Distribution of conformal contact pressure in spherical plain bearings considering friction and free-edge effects

2020 ◽  
pp. 135065012097551
Author(s):  
Li Yuan ◽  
Han Bao ◽  
Xuefeng Yao ◽  
Jianguo Lu ◽  
Jie Liu
Keyword(s):  
Finite Element ◽  
Contact Pressure ◽  
Contact Stress ◽  
Edge Effects ◽  
Compressive Strain ◽  
Circumferential Stress ◽  
Free Edge ◽  
Contact Theory ◽  
Theoretical Methods ◽  
Conformal Contact

The pressure distribution of conformal contact in spherical plain bearings is studied adopting both theoretical methods and finite element simulations. The effects of normal loads and friction coefficients on the distribution of both axial and circumferential contact stress are investigated. The results show that the circumferential stress can be exactly described with the complete spherical conformal contact theory while the axial one presents strong free-edge effects, mainly caused by the compressive strain. In addition, the distribution of contact stress tends to be uniform with the increase of the load and the friction coefficient, referring to a decrease of contact pressure in the central region and a rise on both edges of the outer ring, which can be attributed to the obstruction effects of friction on the deformation of bearings and the corresponding alteration of contact area.

scholarly journals Three-Dimensional Investigation of Free-Edge Effects in Laminate Composites Using X-ray Tomography and Digital Volume Correlation

2014 ◽  
Vol 55 (1) ◽  
pp. 301-311 ◽  
Author(s):  
P. Lecomte-Grosbras ◽  
J. Réthoré ◽  
N. Limodin ◽  
J.-F. Witz ◽  
M. Brieu
Keyword(s):  
Edge Effects ◽  
Three Dimensional ◽  
Free Edge ◽  
Digital Volume Correlation ◽  
Laminate Composites ◽  
X Ray

Parametric Studies for Free-edge Effects of Corrugated Laminates

2018 ◽  
Vol 2018.56 (0) ◽  
pp. 321
Author(s):  
Shuhei YOKOYAMA ◽  
Shinya HONDA ◽  
Katsuhiko SASAKI ◽  
Ryo TAKEDA ◽  
Gerald KRESS ◽  
...  
Keyword(s):  
Edge Effects ◽  
Free Edge ◽  
Parametric Studies

Free-Edge Effects in Composite Laminates

2007 ◽  
Vol 60 (5) ◽  
pp. 217-245 ◽  
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.

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

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.

Free-Edge Effects in Anisotropic Laminates Under Extension, Bending, and Twisting, Part II: Eigenfunction Analysis and the Results for Symmetric Laminates

1994 ◽  
Vol 61 (2) ◽  
pp. 416-421 ◽  
Author(s):  
W.-L. Yin
Keyword(s):  
Eigenvalue Problem ◽  
Edge Effects ◽  
Free Edge ◽  
Interlaminar Stresses ◽  
Particular Solutions ◽  
Variational Solutions ◽  
Stress Functions ◽  
Polynomial Expansions ◽  
Eigenfunction Analysis

The eigenvalue problem associated with the determination of the interlaminar stresses in a laminated strip is examined and physical interpretations are given to the (constant) particular solutions and the complementary solutions of the problem. The case of symmetric laminates is considered in detail, and variational solutions are computed for four-layer, symmetric, cross-ply, and angle-ply laminates subjected to the three fundamental types of strain loads. Solutions based on two sets of stress functions with polynomial expansions of different degrees are compared with each other and with the existing solutions to assess the accuracy. The interfacial values of the stress functions and their derivatives are identified as the resultant peeling and shearing forces over end intervals of the interface.

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