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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 forms

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 forms

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 forms

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 forms

  • 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 forms

  • 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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