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9 Cards in this Set

  • Front
  • Back
AutoClave
Heater Pressure Vessel
-designed/built to ASME code
- redundant safety features
Instrumentation
- thermocouples
- pressure and vacuum gages
Control System
- computer operated, controlled
- programmable
-data acquisition
AutoClave: Advantages
- Typical Prepreg resin needs pressure to flow and evacuate voids
- Proper Curing
- Toughned resin systems
- Thermoplastic Composites
- Legacy Technology
Composite Processing
Properly cure advanced fiber-reinforced, aerospace grade ploymer-matrix composite materials
-heat
- consolidation pressure
- vacuum
Majority of carbon fiber aerospace components are processed in autoclaves
Composite Processing Steps
A: Initial heat ramp from room temperature
B: Dwell (hold) after set-point temperature attained
C: Pressure ramp initiation after minimum T/C reaches temperature
D: Heat ramp to next setpoint
E: Exotherm of composite part
F: Final dwell at cure temperature
G: Cool down after required cure time
H: Pressure release
I: Vacuum held throughout cure cycle
Goals of autoclave cure
* Proper bleed (fiber volume, consistent density)
* Consolidation (interlaminar strength & toughness)
* Fiber Volume (in-plane properties)
* Low Void Content (fatigue & environmental effects)
* Surface requirements (application dependent)
* Dimensional stability/tolerance
Hand Layup Characteristics
Hand Layup Characteristics
* Relatively labor intensive
- ply cutting
- ply positioning
- bagging
* Single-component fabrication technique
- multiple stage possible
* Material costs
- prepreg
- bagging supplies
- tooling (typically non-recurring)
* High precision
- accurate ply location & repeatability
Composite Testing
ASTM D 4762-04
Standard Guide for testing polymer matrix composite materials
Composite Testing
Orthotropic/Anisotropic (composites) vs Isotropic (metals)
Test specimen design
Machining/preparation
Failure modes
Environmental conditions
Various Composite test specimens
In-plane or interlaminar shear
Mode I fracture
Interlaminar Shear
Open hole tension
Bearing
Impact Properties