Book reviewsComposite materials: fatigue and fracture: Edited by: H.T. Hahn ASTM STP 907, 1986 (£64.00)

This paper gives details of the input data and a full description of a set of 13 test cases provided to the participants of the third world-wide failure exercise for use in their theoretical models...

Mechanical properties and details of composite laminates for the test cases used in the third world-wide failure exercise:

This paper provides a set of concluding remarks on Part A of the third world-wide failure exercise where a comparison has been made between the capabilities of 12 different mathematical models for predicting the evolution of matrix cracking, damage and failure in continuous fibre-reinforced polymer composites when subjected to multi-axial loading. The originators (or their collaborators) of those theories have employed their methods to 13 carefully selected challenging problems (test cases) addressing the cracking and damage evolution arising from ply thickness, lay-up sequence, size effects and a variety of loading conditions (biaxial, bending, thermal loading and loading-unloading) of a number of unidirectional and multi-directional glass and carbon epoxy laminates. These covered eight different lay-ups consisting of 0°, [0°/90°/0°], [0°/90°8/0°], [0°/90°]s, [±45°]s, [±50°]s, [30°/90°/−30°/90°]s and a family of [0°m/45°m/90°m/−45°m]s, [45°/0°/90°/−45°]s and [0°/45°/−45°/90°]s quasi-isotropic laminates. ...

A comparison between the predictive capability of matrix cracking, damage and failure criteria for fibre reinforced composite laminates: Part A of the third world-wide failure exercise:

Repair of wind turbine blades: Review of methods and related computational mechanics problems

Composite materials have gained popularity in automotive industries due to its lightweight potential, good damping behaviour as well as high strength and stiffness properties. Based on the increase in usage of composites, there is a growing interest for a repair technique in the automotive industry. Along with these raise in demand there comes a need for an all-inclusive review article and the objective of this article is to address this need. Two repair techniques, namely scarfing repair and injection repair, have the potential to be used in automotive industry. This paper compiles the various research work done in this field of repairing along with various processing steps associated with it. Further this paper reviews the non-destructive technique that can be used for damage identification and repair assessment.

Potential repair techniques for automotive composites: A review

This paper presents a multiscale hybrid approach for predicting damage and failure of laminated composite structures based on the thermo-mechanical properties (stress/strain behaviour and strength)...

A multiscale hybrid approach for damage and final failure predictions of composite structures

'Conventional' or certified repair procedures for impacted composite structures (i.e. patches) are time consuming, and must be performed by highly qualified staff. In this paper, a cost effective and simple repair method by liquid resin infiltration is studied. As damages on aircraft structures are generally due to impact, this kind of damage is characterised and compared to quasi-static indentation with ultrasonic inspection and micrographic cuts. The repair by liquid resin is used to fill in the very special damage pattern region organised as a crack network (delamination and transverse cracks). In order to study this new repair method, an experimental set-up has been manufactured and different configurations have been studied. Mechanical testing (CAI, DCB and ENF) was then performed to evaluate the strength of this repair. As good results were achieved, further exploration under complex loading should be performed to ensure the quality of the repair for an industrial application.

Investigation of composite repair method by liquid resin infiltration

The aim of this chapter is to investigate the influence of the intralaminar damage (transverse matrix cracks and their associated local delaminations) on the interlaminar damage (delamination) evolution in composite laminate materials. Using specific device setups and coupons, this influence on the delamination onset and growth is demonstrated experimentally. In order to model this inter/intralaminar damage coupling, a cohesive zone model is developed. It takes into account the influence of the local delamination cracks resulting from transverse matrix cracking in the adjacent plies, damages which are both predicted through a continuum damage model of the ply behavior in the laminate. The application of these models to a double-edge-notched specimen under tensile loading clearly demonstrates the importance of the contribution of the introduced coupling on damage pattern. The aim of this chapter is to investigate the influence of the intralaminar damage (transverse matrix cracks and their associated local delaminations) on the interlaminar damage (delamination) evolution in composite laminate materials. Using specific device setups and coupons, this influence on the delamination onset and growth is demonstrated experimentally. In order to model this inter/intralaminar damage coupling, a cohesive zone model is developed. It takes into account the influence of the local delamination cracks resulting from transverse matrix cracking in the adjacent plies, damages which are both predicted through a continuum damage model of the ply behavior in the laminate. The application of these models to a double-edge-notched specimen under tensile loading clearly demonstrates the importance of the contribution of the introduced coupling on damage pattern.

Influence of Intralaminar Damage on the Delamination Crack Evolution

A multiscale damage model for composite laminate based on numerical and experimental complementary tests

Displacement field measurements and capitalizing on experience: Application to the analysis of the rupture of holed composite plates

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