Lecture 4/5/7 - Elastic and hygrothermal properties Flashcards
What does CLT stand for?
Classic laminate theory
Sometimes you need a cheap lamina, which structure would you use then?
Chopped fiber composite
How is the fibers distributed in the orientation for the chopped fiber composites?
It is suppose to be isotropic, which means that the orientation should be even spread, but it is not!
What does [A], [B] and [D] represent?
[A] = Extensional stiffness matrix [B] = Coupling stiffness matrix [D] = Bending stiffness matrix
What is an Angle-ply laminates?
They have laminae oriented either +θ or -θ where 0°
What is cross-ply laminates?
Consist of plies oriented either θ=0° or θ=90°. They can be symmetric or non symmetric.
What is weathering?
Is how weather affects the properties of the composite.
What can weathering be?
Radiation (UV rays), Moisture, Temperature etc
What is another word for lamina?
ply
When you rotate the axes to match the fiber direction, what do you call the new setup?
principal axes.
What is an antisymmetric laminate?
An antisymmetric laminate has plies of identical material and thickness at equal positive and negative distance z from midplane, but the ply orientations are antisymmetric, that is for a given positive angle, a negative angle occurs at the corresponding position.
What is a nonsymmetric laminate?
If there is no symmetry or antisymmetri
What is a balanced cross-ply laminate?
It has equal number of indentical 0° and 90° ply
How is the fibers loaded in the voigt model vs Reuss model=
Longitudinal direction and transverse direction
What does hygroscopic mean?
Water intake
