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Other Product Forms Considerations. RTM and VARTM Materials (Constituents – resin, fiber, tackifiers, cores, stitches/pins, special forms; also consumable materials) Processes (Fiber processing, ply cutting, lay-up, preforming, demolding, post-mold operations) Sandwich

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other product forms considerations
Other Product Forms Considerations
  • RTM and VARTM
    • Materials (Constituents – resin, fiber, tackifiers, cores, stitches/pins, special forms; also consumable materials)
    • Processes (Fiber processing, ply cutting, lay-up, preforming, demolding, post-mold operations)
  • Sandwich
    • Materials (Constituents – skin, core, adhesives, core splice; also consumable materials)
    • Processes (Core processing, special details, inspection)
rtm and vartm material considerations
RTM and VARTM Material Considerations
  • Procurement considerations similar to that of the prepreg material producer
  • All constituent materials (including fiber sizing, tackifiers, additives, additives, pins, stitching, etc.) need to be controlled via material specs. with out time, packaging, & other critical parameters properly controlled & documented.
rtm and vartm material considerations cont d
RTM and VARTM Material Considerations (cont’d)
  • Cores, fly-away mandrels (density and stability), consumable/wash-out tooling
  • Tooling and consumable materials including release agents, cleaning techniques, sealing techniques, bagging materials/bleeders, bagging techniques, and flow media
rtm and vartm material considerations cont d1
Neat resin controls are numerous and dependant on material forms

Hot melt, heat-activated ingredients, degassed liquid resin, viscosity, visual/color, cure parameters, other parameters

Tackifiers

Liquid/aqueous and powder

Physical parameters (powder size, viscosity), cure parameters, ingredients/chemistry, other

Resin compatibility

RTM and VARTM Material Considerations (cont’d)
rtm and vartm process considerations
Fiber processing

Braiding, specialty weaving, stitching, pinning, hybrids, special forms (T’s, H’s, etc.), automation, consumables

Lay-up and Preforming (MOST CRITICAL!)*

Special tooling/fixturing for complex shapes

Special details (braids, cores, T’s, noodles, etc.)

Ply cutting and handling – multi-ply packs/kits

Preform locating techniques (tooling pins, features)

Tackifiers, pins, stitches, etc.

Special tooling/fixtures and processes

RTM and VARTM Process Considerations

* If the preform is wrong, STOP!

rtm and vartm process considerations cont d
Tool Closure, Injection and Cure

Gap measurement, vacuum check, bag check

Resin injection/infusion sequence/cycle

Critical heating areas, heat-activated ingredients/cure agents (preform=filter)

Heat-up

Vacuum (hard)

Inject/infuse resin

Bleed technique/sequence, bag check

Ramp-up, back pressure

Plumbing diagram (consumable plumbing, preheater)

RTM and VARTM Process Considerations (cont’d)
rtm and vartm process considerations cont d1
Demolding

Mandrel extraction - critical sequences

Wash-out mandrels

Tooling holes/fixturing features

Neat resin sample or witness laminate

Tool cleaning and prep

Post-molding Operations

Typical but usually more complex

RTM and VARTM Process Considerations (cont’d)
sandwich material considerations
Sandwich Material Considerations
  • Generally the same as hand lay-up
  • Core control/core storage and preparation
  • Core orientation – L & W (&Z) properties
  • Core corrosion control/treatment
  • Core splice and other materials
  • Bleeders and other consumables
  • Resin flow parameters criticality – determines fillet characteristics/strength
sandwich process considerations
Sandwich Process Considerations
  • Similar to hand lay-up
  • Core handling, core cutting
  • Special details/hard points – bond prep and location features
  • Orientation - L, W & Z directions
  • Core forming & core splice
  • Cure parameters
  • Inspection – Coin-tap? Other testing?
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