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Posts tagged 'stress'

The Free Edge Effect

The free edge effect is an inter-galactic phenomenon found on the outer reaches of the cosmos that leads to a parallel…well…no, not exactly. What I’m referring to is a region within a laminate that produces a fully three-dimensional stress field at the free edge, then decays quite rapidly to a two-dimensional stress field as the distance from the free edge increases. The three-dimensional stress field is responsible for delamination at a free edge, and is commonly referred to as inter-laminar stresses. A composite analysis is typically confined to classical lamination theory. Unfortunately, this assumes that all out-of-plane stresses are zero, making the determination of transverse stresses impossible. Consequently, this assumption is not valid when one is interested in calculating out-of-plane stresses in regions near or at a free edge. 

stress  Poisson  notch  inter-laminar  free edge  cutout

2018-07-05 22:34:25
 

Flatwise Tension in a Curved Plate

Composites…It’s not just a 2D world…got Flatwise Tension? 

Too often I hear both analysts and designers toss around the term quasi-isotropy…a mythical monster to some, an in-plane idealization to simplify a 3D problem for others. I for one am guilty…because I appreciate the fact that you can take a complex 3D composite problem and knock it down a dimension...in this case, the out-of-plane direction.

tension  stress  radius  plate  flatwise  failure  curved

2017-09-17 04:42:20
 
Quick-Pick Article
  • 18 Nov 2017, 08.11
    Is your laminate special? I would like to think that all my laminates are special…and I’m sure that, well, all of your ...