Laminates of Orthotropic plies • Section 2.4.3 for in-plane loading only • Hooke’s law for k-th ply • Stress resultants 0 11 12 16 0 12 22 26 0 16 26 66 () x x y y xy xy k Q Q Q Q Q Q Q Q Q /2 1 1 /2 () x x x h N y y y k k k h xy xy xy k N N dz z z N
Laminates of Orthotropic plies. Section 2.4.3 for in-plane loading only Hooke’s law for k- th ply Stress resultants. A Matrix. Basic equation is the same as in isotropic case, , but 16 and 26 terms We now use the Tsai-Pagano “invariants” Leading to lamination parameters. - PowerPoint PPT Presentation
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Laminates of Orthotropic pliesSection 2.4.3 for in-plane loading
onlyHookes law for k-th ply
Stress resultants
A Matrix
Effective propertiesFrom Qs to As using lamination
parameters
Effective properties
Hookes law with effective propertiesAverage stresses
Hookes law
Typical stiffness optimization problemNo stresses in individual
plies, so no credible failure constraint.
When 0-deg, 90-deg and 45-deg plies are present this is
reasonable even for strength.
![NOTCH SENSITIVITY OF COMPOSITE SANDWICH STRUCTURES...ABAQUS cohesive elements added between plies ! Good agreement with [45/0/-45/90] 2S and [90/45/0/-45] 2S laminates ! Not able to](https://img.pdfslide.us/doc/110x75/5e9186bf561e3d3eaa5fe6c9/notch-sensitivity-of-composite-sandwich-structures-abaqus-cohesive-elements.jpg)
