Publication detail

Stress Distribution Investigation at the Tapered Sandwich Endings

LÖFFELMANN, F.

Original Title

Stress Distribution Investigation at the Tapered Sandwich Endings

English Title

Stress Distribution Investigation at the Tapered Sandwich Endings

Type

journal article - other

Language

en

Original Abstract

One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration.

English abstract

One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration.

Keywords

Sandwich endings, Tapering, Ramp, Closeout, FEM, Filler, Ply drop.

Released

01.02.2018

Publisher

Institute of Aviation, Warsaw

Location

Varšava, Polsko

Pages from

62

Pages to

79

Pages count

18

URL

Documents

BibTex


@article{BUT145123,
  author="František {Löffelmann}",
  title="Stress Distribution Investigation at the Tapered Sandwich Endings",
  annote="One of the typical sandwich ending is tapered transition to a solid laminate, which causes significant stress distribution changes. The reviewed articles show that tapered area causes increase in the shear stress in the core, increase of the axial forces in the facesheets and local bending at the fork point, points of the tapering angle change, and at ply drop positions. Most of the studies gave attention to the endings without reinforcing. During Erasmus+ internship at KTH 2D model of the tapered ending with reinforcing plies, various geometry and resin filler in the core tip was investigated to see the influence on the stress distribution. It was found that tension load case is not as critical as bending load case. Increasing of the solid laminate thickness, adding plies and inserting a short resin or adhesive filler into the core tip area lead to significant stress reduction, whereas in the transition point, from tapering to constant thickness sandwich, increasing radius is more efficient than reinforcing plies in regard to reduce stress concentration.",
  address="Institute of Aviation, Warsaw",
  chapter="145123",
  howpublished="online",
  institution="Institute of Aviation, Warsaw",
  number="4(249)",
  volume="2017",
  year="2018",
  month="february",
  pages="62--79",
  publisher="Institute of Aviation, Warsaw",
  type="journal article - other"
}