Notched strength of carbon fibre/epoxy composite laminates with a circular hole

1999 ◽  
Vol 65 (7) ◽  
pp. 295-300 ◽  
Author(s):  
P. K. Govindan Potti ◽  
B. Nageswara Rao ◽  
V. K. Srivastava
Keyword(s):  
Carbon Fibre ◽  
Circular Hole ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Notched Strength

Notched strength of carbon fibre/epoxy composite laminates with a circular hole

2000 ◽  
Vol 65 (10) ◽  
pp. 295-300 ◽  
Author(s):  
P. K. Govindan Potti ◽  
B. Nageswara Rao ◽  
V. K. Srivastava
Keyword(s):  
Carbon Fibre ◽  
Circular Hole ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Notched Strength

scholarly journals Enhancement of Mechanical Properties of Flax-Epoxy Composite with Carbon Fibre Hybridisation for Lightweight Applications

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 109 ◽  
Author(s):  
Hom Nath Dhakal ◽  
Mohini Sain
Keyword(s):  
Carbon Fibre ◽  
Tensile Properties ◽  
Composite Laminates ◽  
Failure Modes ◽  
Epoxy Composite ◽  
Hybrid Composites ◽  
Environmental Scanning Electron Microscopy ◽  
Tensile Modulus ◽  
Tensile Tests ◽  
Flax Fibre

The effect of unidirectional (UD) carbon fibre hybridisation on the tensile properties of flax fibre epoxy composite was investigated. Composites containing different fibre ply orientations were fabricated using vacuum infusion with a symmetrical ply structure of 0/+45/−45/90/90/−45/+45/0. Tensile tests were performed to characterise the tensile performance of plain flax/epoxy, carbon/flax/epoxy, and plain carbon/epoxy composite laminates. The experimental results showed that the carbon/flax fibre hybrid system exhibited significantly improved tensile properties over plain flax fibre composites, increasing the tensile strength from 68.12 MPa for plain flax/epoxy composite to 517.66 MPa (670% increase) and tensile modulus from 4.67 GPa for flax/epoxy to 18.91 GPa (305% increase) for carbon/flax hybrid composite. The failure mechanism was characterised by examining the fractured surfaces of tensile tested specimens using environmental scanning electron microscopy (E-SEM). It was evidenced that interactions between hybrid ply interfaces and strain to failure of the reinforcing fibres were the critical factors for governing tensile properties and failure modes of hybrid composites.

Rate dependence of mode I fracture behaviour in carbon-fibre/epoxy composite laminates

1998 ◽  
Vol 58 (3-4) ◽  
pp. 591-602 ◽  
Author(s):  
Takayuki Kusaka ◽  
Masaki Hojo ◽  
Yiu-Wing Mai ◽  
Tomoaki Kurokawa ◽  
Taketoshi Nojima ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Composite Laminates ◽  
Fracture Behaviour ◽  
Epoxy Composite ◽  
Rate Dependence ◽  
Mode I ◽  
Mode I Fracture

Notched strength estimations of graphite/epoxy composite laminates containing central holes and cracks: A statistical approach

2004 ◽  
Vol 108 (1083) ◽  
pp. 263-269
Author(s):  
P. K. G. Potti ◽  
B. N. Rao ◽  
V. K. Srivastava
Keyword(s):  
Composite Laminates ◽  
Statistical Approach ◽  
Epoxy Composite ◽  
Fracture Data ◽  
Notched Strength

Abstract A statistical approach is followed for prediction of tolerences of notched strength of composite laminates using the recently proposed improved inherent flaw model (IFM). In order to examine the validity of this approach, the existing fracture data on graphite/epoxy composite laminates containing central holes and cracks were used. The notched strength estimations are found to be within the range of tested values.

scholarly journals Compressive Failure Behaviour of Unidirectional and Woven Kevlar/Epoxy Composite Laminates under Various Angles of Fiber Orientation

2019 ◽  
Vol 9 (1) ◽  
pp. 5868-5872
Keyword(s):  
Failure Analysis ◽  
Flat Plate ◽  
Circular Hole ◽  
Fiber Orientation ◽  
Composite Laminates ◽  
Composite Laminate ◽  
Epoxy Composite ◽  
Failure Criteria ◽  
Compressive Failure ◽  
Failure Behaviour

Studies have shown that the angle of fiber orientation significantly affects the mechanical properties of a composite laminate. Due to this, accurate prediction of the laminate response because of the loading effect is crucial. Many investigations on the properties of composite materials have been conducted. However, there is still the lack of study related to Kevlar/Epoxy laminate. Therefore, this study aims to investigate the effect of the angle of fiber orientation to woven and unidirectional (UD) Kevlar/Epoxy laminates under compression state. The study was conducted in two stages comprising of numerical validation and failure analysis. For the failure analysis, a flat plate and flat plate with circular hole under compression were modelled using ANSYS. Two of the most common failure models, Maximum Stress Theory and Tsai-Wu Failure criteria were selected for the failure prediction. The laminates were made of 24 layers woven Kevlar/Epoxy and the stacking sequence was (θ4 /04 /-θ4 )s. The angle of fiber orientations, θ, have been varied from 0° to 90° and failure loads for both flat plate and flat plate with circular hole were determined. The trend of displacement and failure behaviour for both types of plate were compared. The results show that the angle of fiber orientation affects significantly the trend of the displacement and failure curves of UD and woven Kevlar/Epoxy. The curves for UD and woven; flat plate and flat plate with circular hole are different and unique in nature; and thus should be treated individually. These analysis and findings are important in aiding the engineers at designing a stronger woven Kevlar/Epoxy composite laminate. Therefore, it can be concluded that the current study has contributed towards enhancing knowledge about the compressive failure behaviour of unidirectional and woven Kevlar/Epoxy composite laminates

Sign in / Sign up

Export Citation Format

Share Document