Application of the Puck failure theory for fibre-reinforced composites under three-dimensional stress: Comparison with experimental results

2013 ◽  
Vol 47 (6-7) ◽  
pp. 827-846 ◽  
Author(s):  
H Matthias Deuschle ◽  
Alfred Puck
Keyword(s):  
Three Dimensional ◽  
Experimental Results ◽  
Reinforced Composites ◽  
Failure Theory ◽  
Fibre Reinforced Composites

The effect of microscale residual stress from thermal cooldown on the nanoindentation properties of fibre-reinforced composites

2016 ◽  
Vol 50 (29) ◽  
pp. 4147-4158 ◽  
Author(s):  
M Hardiman ◽  
TJ Vaughan ◽  
CT McCarthy
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Fibre Composite ◽  
Three Dimensional ◽  
Interfacial Region ◽  
Indentation Modulus ◽  
Reinforced Composites ◽  
Carbon Fibre Composite ◽  
Residual Stress State ◽  
Fibre Reinforced Composites

A two-step finite element framework is presented that examines the effect of microscale thermal residual stress on the nanoindentation properties of fibre-reinforced composites. Firstly, micromechanical modelling is used to determine the residual stress state following thermal cooldown of a carbon-fibre composite material from cure temperature. A three-dimensional finite element nanoindentation model is then used to characterise the effects of residual stress on material properties determined by nanoindentation theory. The results show that the hardness of the matrix pockets decreases following thermal cooldown due to the existence of equibiaxial tensile residual stresses. The hardness property is also found to decrease for the majority of interfacial region stress states, while the microstructural areas where the effects of the residual stress are nullified are determined. The indentation modulus property is relatively insensitive to the microstructural residual stress, and thus is the recommended indentation property to be determined when carrying out a comparative parametric analysis between microstructural regions. The property changes are shown to be insensitive to any errors associated with contact area estimation using the Oliver and Pharr method.

Extrusion Freeform Fabrication of Chopped-Fibre Reinforced Composites

1997 ◽  
Vol 9 (4) ◽  
pp. 449-456 ◽  
Author(s):  
Paul Calvert ◽  
Tung Liang Lin ◽  
Hogan Martin
Keyword(s):  
Carbon Fibre ◽  
Epoxy Resin ◽  
Elastic Properties ◽  
Fibre Orientation ◽  
Three Dimensional ◽  
Reinforced Composites ◽  
Freeform Fabrication ◽  
Large Influence ◽  
Fibre Reinforced Composites ◽  
Extrusion Freeform Fabrication

Extrusion freeform fabrication is a process whereby three-dimensional parts are built by writing successive layers of material onto a support. In this case, two types of epoxy resin have been formed into test bars containing varying fractions of chopped carbon fibre of various lengths. It is shown that the fibre orientation follows the writing direction and has a large influence on the directional elastic properties of the composite. Test bars have also been formed containing multiple layers of reinforced and unreinforced resin to demonstrate the flexibility of this method.

Statistical aspects of failure of fibre-reinforced composites

1998 ◽  
Vol 212 (3) ◽  
pp. 189-192 ◽  
Author(s):  
M R Wisnom
Keyword(s):  
Composite Materials ◽  
Experimental Results ◽  
Reinforced Composites ◽  
Weibull Statistics ◽  
Stressed Volume ◽  
Significant Variability ◽  
Statistical Effects ◽  
Fibre Reinforced Composites

Composite materials show significant variability in strength, which means that statistical effects need to be considered when predicting failure. Experimental results are presented which show decreasing strength with increasing stressed volume of material. Approaches accounting for this in predicting strength using Weibull statistics are discussed.

scholarly journals Three-dimensional invariant-based failure criteria for fibre-reinforced composites

2015 ◽  
Vol 55 ◽  
pp. 92-107 ◽  
Author(s):  
P.P. Camanho ◽  
A. Arteiro ◽  
A.R. Melro ◽  
G. Catalanotti ◽  
M. Vogler
Keyword(s):  
Three Dimensional ◽  
Failure Criteria ◽  
Reinforced Composites ◽  
Fibre Reinforced Composites

scholarly journals Analysing Effect of Direction of Layups to Distortions of Laminated Carbon Fibre-Reinforced Composites

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Dharu Feby Smaradhana
Keyword(s):  
Thermal Expansion ◽  
Carbon Fibre ◽  
Edge Effects ◽  
Experimental Results ◽  
Chemical Shrinkage ◽  
Reinforced Composites ◽  
Factors Affecting ◽  
Laminate Theory ◽  
Fibre Reinforced Composites

The distortions of the laminates (flat panels and channel sections) with different stacking sequences were investigated in this lab session. There were two methods compared, measurement of the experimental specimens and prediction using classical laminate theory. The experimental results showed that the specimens with layup (90,0<sub>3</sub>) and (0<sub>3</sub>,90) had the largest curvature. The spring forward/back angles of the measurement was higher than those of the prediction though the trends of the distortions of the channel and the flat specimens were almost similar. There were several factors affecting distortions such as the tool thermal expansion, chemical shrinkage, the arrangement of vacuum bag and edge effects.

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