Coupon
A coupon is a small piece of material used for testing material properties
Coupons will be put under tensile, compression, shear, bending, and other loads to test the material to get it’s strength, stiffness, and other aspects
Example: Tensile bending coupon
Isotropic
Isotropic materials "act" the same under different material orientations
If an isotropic material is rotated, then the stresses experienced by the material won’t change. The opposite of an isotropic material is an anisotropic material. Wikipedia
Example: Aluminium
Most metals are isotropic. For example, aluminium has a small crystalline structure. On the large scale, a big cube of aluminium doesn’t “act differently” (experience different stresses) if you compress it on one axis compare to the other
Anisotropic
Anisotropic materials "act" differently under different material orientations
If an anisotropic material is rotated, then the stresses experienced by the material will change. The opposite of an anisotropic material is an isotropic material
Composite laminates delamination when sheared or peeled part
Composite laminates like Carbon Fibre laminates will experience fibre/matrix failure on uniform longitudinal loads (loads squishing/stretching the fibres), but could experience
Delamination
Delamination is when layers get pulled apart
Delamination happens to laminates (layers of material with adhesive in between)
Delamination is like when your lasagne slides apart. The pasta sheets themselves held together but the meat and sauce in between wasn’t sticky enough to hold the sheets together when you try to peel them apart.Composite laminates
Composite laminates like Carbon Fibre laminates will peel apart under high peeling loads or shear loads
Carbon Fibre Reinforce Composites
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Fatigue Strength
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Adherend
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