Over recent years, the use of advanced composite materials in aeronautical, automotive and sporting applications has been consolidated. The characteristics of composite materials in terms of weight reduction, resistance to fatigue and corrosion make them competitive in many cases compared to conventional ones. On the other hand, the manufacturing process of composites reinforced with carbon or glass fibers (the most used) requires complex processes that are often not environmentally friendly, mostly because these composite materials are not in themselves “green”. For these reasons, in recent decades, the use of natural reinforcing fibers has gained increasing attention, allowing the development of new materials that share the same advantages as conventional composite systems while respecting the environment. Promising results have been found for biobased resins loaded with natural fibres origin such as jute, flax, hemp and so on. Due to their structural complexity, these materials are not always compatible with the use of standard non-destructive evaluation methods, such as ultrasonic testing. In this work, the use of shearography as a non-destructive investigation method in full field and in non-contact mode was validated on “green” polypropylene/basalt fabric composite specimens prepared by film stacking and compression molding procedures.

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Defect and Damage Detection in “Green” Laminates Using Shearography

  • V. Pagliarulo,
  • C. Saltarelli,
  • M. Paturzo,
  • I. Papa,
  • P. Russo

摘要

Over recent years, the use of advanced composite materials in aeronautical, automotive and sporting applications has been consolidated. The characteristics of composite materials in terms of weight reduction, resistance to fatigue and corrosion make them competitive in many cases compared to conventional ones. On the other hand, the manufacturing process of composites reinforced with carbon or glass fibers (the most used) requires complex processes that are often not environmentally friendly, mostly because these composite materials are not in themselves “green”. For these reasons, in recent decades, the use of natural reinforcing fibers has gained increasing attention, allowing the development of new materials that share the same advantages as conventional composite systems while respecting the environment. Promising results have been found for biobased resins loaded with natural fibres origin such as jute, flax, hemp and so on. Due to their structural complexity, these materials are not always compatible with the use of standard non-destructive evaluation methods, such as ultrasonic testing. In this work, the use of shearography as a non-destructive investigation method in full field and in non-contact mode was validated on “green” polypropylene/basalt fabric composite specimens prepared by film stacking and compression molding procedures.