Mechanical behaviour of a short-fibre composite

When a coated short fibre composite is subjected to temperature change, thermal stresses in and around the coated fibres are induced due to the mismatch of thermal expansion coefficients of the constituents, resulting in a possibility of cracking in the coating. The problem of the above thermal stresses in a coated short fibre composite is solved by using the Boussinesq-Sadowsky stress functions. The present results are compared with Eshelby’s solutions for an extreme case and good agreement between the two methods is obtained. A parametric study is then conducted to examine the effect of the geometry and thermo-mechanical properties of the coating on the stress field in and around a coated short fibre. It is found in this study that the stress field in the coating is sensitive to the properties and geometry of the coating.

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Prediction of mixed-mode cracking direction in random, short-fibre composite materials

Composites ◽

10.1016/0010-4361(89)90694-0 ◽

1989 ◽

Vol 20 (1) ◽

pp. 93

Keyword(s):

Composite Materials ◽

Mixed Mode ◽

Fibre Composite ◽

Short Fibre ◽

Short Fibre Composite

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Ultrasonic Damage Detection of Impacted Long and Short Fibre Composite Specimens

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.827.31 ◽

2019 ◽

Vol 827 ◽

pp. 31-36

Author(s):

Andrea Sellitto ◽

Aniello Riccio ◽

A. Russo ◽

Carmine Napolitano ◽

Mauro Zarrelli ◽

...

Keyword(s):

Volume Fraction ◽

Fibre Composite ◽

Short Fibre ◽

Low Velocity ◽

Short Fibres ◽

Ultrasonic Damage ◽

The Impact ◽

Non Destructive ◽

Impact Damages ◽

Short Fibre Composite

Composite materials structures are particularly susceptible to the damages induced by low-velocity impacts that may result in Barely Visible Impact Damages (BVIDs), which can hardly be identified through visual inspection. These damages are particularly dangerous, since they can critically reduce the mechanical properties of the impacted structures. In this work, the damage induced in impacted long and short fibre composite specimens has been experimentally evaluated by means of Non-Destructive Technique (NDT) inspections. The damages size and location have been evaluated by means of ultrasonic testing to assess the influence of fibres aspect ratio (long and short fibres), fibres material (carbon and glass), volume fraction, and impact energy for low velocity impacts on composite specimens. Considerations about the failure mechanisms arising as a consequence of the impact event and their interactions have been finally introduced.

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