What is a composite? Composites = Matrix (resin) + Reinforcing Material (Fiber)
Types of resin include: Polyester, Vinylester, and Epoxy.
Type of fibers include glass, carbon, Kevlar, and aluminum.
Why use composites? Benefits include: reduced weight, high strength and stiffness properties, high thermal and corrosion resistance, and a good fatigue life. What are the manufacturing technology benefits from using composites? Tailor ability, flexibility, and part number reduction.
How are composites manufactured? There are several different methods:
- Fabric Hands Lay-up – monolithic type or sandwich structures
- Tape Laying – large composite structures
- RTM – complex shapes
- Fiber Placement – large composite structures
- Filament winding – mandrel shapes
- IML=inner mold line. Corresponds to top surface of a composites part
- NCF=non crimp fabrics
- ETBS=Edges to be Staggered
- EOP=Edge of Part
- MEOP=Manufacturing Edge of Part
- EEOP=Engineering Edge of Part
- Rosette=axis system
- TL=thickness law
- SS=Stacking Sequences
For the grid method the part is divided up into a grid. Each section of the grid has a name (C1, C2, etc.). Each section of the grid is then given a defined thickness law. The thickness law says how thick the material will be in that zone. This is done by indicating the number of plies in each direction. Example:
Thickness Law 1's material will be Carbon 0.4. # plies in the zero degree direction = 8, number of plies rotated 45 degree = 8, number of plies rotated -45 degree=8, number of plies rotated 90 degrees=9.
Looks like this in Excel which is then imported into CATIA.
Thickness laws can be applied manually or imported through an Excel table.
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