Shrinkage stresses near a discontinuity in a fibre composite material

1972 ◽  
Vol 7 (1) ◽  
pp. 54-60 ◽  
Author(s):  
N K Asamoah ◽  
W G Wood
Keyword(s):  
Composite Material ◽  
Stress Concentration ◽  
Tensile Stress ◽  
Fibre Composite ◽  
Matrix Cracking ◽  
Axial Tensile ◽  
Fibre Composites ◽  
The Matrix ◽  
Fibre Composite Material

The technique of photothermoelasticity has been used to analyse the shrinkage stresses near to a discontinuity in a model of a fibre composite material. The axial-shrinkage stresses away from the discontinuity are tensile in the matrix and compressive in the fibre, while, between the ends of the discontinuous fibre they are wholly compressive. Under an applied axial tensile stress the presence of shrinkage stresses would therefore tend to reduce the tendency for matrix cracking to occur in the gap between the fibre ends where the tensile-stress concentration is high. However, if the fibres are close together the shrinkage stresses can themselves cause matrix cracking. These observations are reinforced by the results of other work on the strength of single- and multiple-fibre composites.

Incremental Damage Development in a 3D Woven Carbon Fibre Composite

2007 ◽  
Vol 15 (7) ◽  
pp. 521-533
Author(s):  
S. King ◽  
G. Stewart ◽  
A.T. McIlhagger ◽  
J.P. Quinn
Keyword(s):  
Carbon Fibre ◽  
Fibre Composite ◽  
Weight Ratio ◽  
Matrix Cracking ◽  
Limiting Factors ◽  
Damage Development ◽  
Carbon Fibre Composite ◽  
Damage Initiation ◽  
Fibre Composites ◽  
Carbon Fibre Composites

Interest in 3D woven carbon fibre composites has increased within industries such as aerospace, automotive and marine, due to their high strength to weight ratio, their increased tailorability and their capacity to be manufactured into near net shape preforms, thereby reducing parts count, assembly time, labour intensity and costs. It is vital that critical areas of concern such as damage (and in particular damage initiation and development) are studied and understood, thereby reducing the limiting factors to their acceptance. The damage initiation and subsequent intervals of development for ILSS (Interlaminar Shear Strength) were determined experimentally. Particular focus is paid to the significance of binder edge and binder middle testing and the influence of through-the-thickness (T-T-T) reinforcement in relation to damage types and development. Control samples for binder edge and binder middle loading locations were tested to failure as a means of determining an average point of failure, allowing the generation of testing intervals. The performance and architecture of samples from each incremental interval were characterised using a combination of graphical analysis and optical microscopy with the aid of dye-penetrant to highlight fibre damage and matrix cracking. Samples displayed specific damage initiation points, thus allowing the generation of a damage guide relating to applied force. In addition, the results imply that a relationship exists between the location of applied load and subsequent damage, thus showing the significant influence played by the T-T-T binder loading location on damage development within 3D woven carbon fibre composites. Some of the preliminary data shown in this paper was presented at IMC23 at the University of Ulster, UK in August 2006 and at Texcomp 8 in Nottingham, UK October 2006.

Thigmo-Morphogenetic Fiber Composites Embedded with Shape Memory Alloys

2012 ◽  
Vol 80 ◽  
pp. 102-111
Author(s):  
Maria Mingallon ◽  
Sakthivel Ramaswamy
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Fibre Composite ◽  
Fiber Composites ◽  
Material System ◽  
Fibre Optics ◽  
Fibre Composites ◽  
Biological Composites ◽  
Definition Of ◽  
Fibre Composite Material

The premise of this research is to integrate sensing and actuation functions into a fibre composite material system. Fibre composites, which are anisotropic and heterogeneous, offer the possibility for local variations in their material properties. Embedded fibre optics are herein used to sense, while shape memory alloys provide actuation capabilities to the resulting composite. The definition of the geometry, inspired by the organization strategies found in biological composites, complements the functioning of the adaptive material system at both local and global levels, allowing it to display integrated functionality.

In-vivo assessment of a new long fibre composite material for craniomaxillofacial reconstruction

2005 ◽  
Vol 34 ◽  
pp. 83
Author(s):  
S.E. Fisher ◽  
C. Efeoglu ◽  
J.L. Burke ◽  
C.A. Scotchford ◽  
M.S. Shahtaheri ◽  
...  
Keyword(s):  
Composite Material ◽  
Fibre Composite ◽  
Fibre Composite Material ◽  
In Vivo Assessment

scholarly journals Thermal Properties of Short Fibre Composites Modeled by Meshless Method

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Vladimír Kompiš ◽  
Zuzana Murčinková
Keyword(s):  
Heat Flux ◽  
Composite Material ◽  
Aspect Ratio ◽  
Meshless Method ◽  
Large Aspect Ratio ◽  
Fibre Composites ◽  
Short Fibres ◽  
Temperature Heat ◽  
The Matrix ◽  
Continuous Source

Computational model using continuous source functions along the fibre axis is presented for simulation of temperature/heat flux in composites reinforced by short fibres with large aspect ratio. The aspect ratio of short fibres reinforcing composite material is often as large as 103 : 1–106 : 1, or even larger. 1D continuous source functions enable simulating the interaction of each fibre with the matrix and also with other fibres. The developed method of continuous source functions is a boundary meshless method reducing the problem considerably comparing to other methods like FEM, BEM, meshless methods, or fast multipole BEM formulation.

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