Fiber breakage

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As fiber breakage (English fiber failure ; FF) is the tearing or breaking a very large number of fiber bundles of a fiber-synthetic material composite understood.

A fiber break in a unidirectional layer leads to the total failure of this single layer , as it loses its load-bearing capacity in the direction of the fiber. The fiber break, unlike the inter- fiber break, is an intolerable form of failure. The reason for this is the high loads that arise in adjacent layers after a fiber break and lead to delamination or inter- fiber breakage there .

The fiber break is the result of a very high load, which is generally caused by tensile or compressive loads parallel to the fibers .

Tensile stress

Under a static longitudinal tensile load, the first filaments of the UD layer tear from around 50% of the breaking load , which leads to whole fiber bundles tearing if the load is further increased. After failure, the individual fibers of the unidirectional layer stick out like a broom. A fiber break due to longitudinal tensile stress can be recognized by the loss of stiffness and the easily audible breaks in the fibers.

Compressive stress

The load-bearing capacity of the fibers is exhausted in the case of longitudinal compressive stress, if the elastic support cannot be maintained by the matrix material: the fibers buckle .

Three types of breakage are possible:

  • due to shear
  • Micro-kinks
  • Shear buckling

See also

literature

  • M. Knops: Analysis of Failure in Fiber Polymer Laminates - The Theory of Alfred Puck . Springer, 2008. ISBN 978-3-540-75764-1 .
  • A. Puck: Strength analysis of fiber-matrix laminates . Hanser, 1996. ISBN 3-446-18194-6 .
  • H. Schürmann: Constructing with fiber-plastic composites . Springer Verlag, 2007. ISBN 978-3-540-72189-5 .

Individual evidence

  1. ^ H. Schürmann: Constructing with fiber-plastic composites . Springer Verlag, 2007. ISBN 978-3-540-72189-5
  2. ^ M. Knops: Analysis of Failure in Fiber Polymer Laminates - The Theory of Alfred Puck . Springer, 2008. ISBN 978-3-540-75764-1
  3. ^ H. Schürmann: Constructing with fiber-plastic composites . Springer Verlag, 2007. ISBN 978-3-540-72189-5
  4. ↑ A. Puck: Strength analysis of fiber matrix laminates . Hanser, 1996. ISBN 3-446-18194-6