Affiliation:
1. Instituto Superior de Engenharia do Porto
2. Instituto Superior de Engenharia do Porto (ISEP)
3. Universidade do Porto
4. INEGI
Abstract
The use of fibre reinforced plastics – FRP’s – in structures is under a considerable
increase. Advantages of their use are related with their low weight, high strength and stiffness. The
improvement of the dynamic characteristics has been profitable for aeronautics, automobile, railway,
naval and sporting goods industries. Drilling is a widely used machining technique as it is needed to
assemble parts in a structure. This is a unique machining process, characterized by the existence of
two different mechanisms: extrusion by the drill chisel edge and cutting by the rotating cutting lips.
Drilling raises particular problems that can reduce mechanical and fatigue strength of the parts. In
this work, quasi-isotropic hybrid laminates with 25% of carbon fibre reinforced plies and 4 mm
thickness are produced, tested and drilled. Three different drill geometries are compared. Results
considered are the interlaminar fracture toughness in Mode I – GIc –, thrust force during drilling and
delamination extent after drilling. A bearing test is performed to evaluate tool influence on the load
carrying capacity of the plate. Results consider the influence of drill geometry on delamination. A
correlation linking plate damage to bearing test results is presented.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Cited by
10 articles.
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