Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [composite]

39 questions
5
votes
1 answer

How do I interpret the curing pressure of a composite from this data sheet?

A question asked about the necessary curing pressures for a composite resin in the autoclave. Looking through the corresponding datasheet (HexPly F155), I'm confused: Cure Procedure Apply vacuum of 22 inches (74 kPa) Hg minimum. Apply 85 + 15 – 0…
BeyondLego
  • 940
  • 6
  • 11
5
votes
1 answer

How do I calculate an estimate for the properties of a composite material?

For a given laminate made of composite material (composed of fibers oriented in a carefully designed sequence coated and embedded in a matrix material), where can I begin estimating the stiffness and/or strength of the material? How can I know…
Mark
  • 5,333
  • 13
  • 47
4
votes
1 answer

How do I cut a crack into a polymer/plastic?

We need to cut a very thin crack into a polymer plate for a research project. The closest thing to what we are looking for is Wire EDM but since the polymer we are using is not conductive we cant use that method. Any suggestions? Is there an…
Murad Nazari
  • 147
  • 1
  • 6
4
votes
2 answers

How to compute core stress in honeycomb structure?

Assume I have a honecomb(sandwich) panel under distributed normal load. Each edge of this panel is simply supported(pinned) as on the picture below: The problem is how to find the core stresses σ-z (not on sides of the panel) as on the picture…
Eugene
  • 73
  • 2
3
votes
2 answers

Impact load of a bullet on a laminate

Can anyone tell me how to go about this problem? There is a square shaped laminate (polyethylene fiber and epoxy resin composite) that is constrained on one side. A gun is fired and the bullet hits the laminate. What kind of stresses result in the…
nihal
  • 145
  • 5
3
votes
0 answers

Is there any formula to model the effective Young's Modulus of a fluid-filled spherical shell?

I am creating composites of a host epoxy and filler particles which are thin-walled fluid-filled shells. Using the Halpin-Tsai equations, for example, I can predict the bulk composite Young's modulus by knowing the particle volume fraction, modulus,…
Trevor Buckner
  • 151
  • 2
3
votes
1 answer

Can the phrases “carbon fibre reinforced polymer composites” (CFRP) and “carbon fibre-epoxy composites” be used interchangeably?

Does the "polymer" in CFRP directly and unambiguously imply the use of an epoxy resin?
aerodokuu
  • 63
  • 5
2
votes
2 answers

What Are The Recommended Binding Methods For A Carbon Fibre Chassis Frame?

I'm looking for a simple way (that doesn't require high pressure chambers or state of the art tools) to permanently bind a set of carbon fibre pieces in order to make the frame of a chassis that could be used in a go kart or dune buggy or even a…
Alfred
  • 23
  • 3
2
votes
2 answers

Can we make engineering grade paper mache by improving on the paper?

Can we bring engineering to the paper in paper mache? It's a mix of a binder and a reinforcing matrix. PVA is common for the binder and is strong. That's fine as I think it's strong enough and readily available. Can we do better for the…
Paul Uszak
  • 896
  • 8
  • 17
2
votes
2 answers

Assessment of a concrete beam being strengthened by an additional steel member

Hi there (from Europe), I am completing what should be a relatively quick assessment for the client, but I have started to second guess my self and would like some reassurance. Essentially the job involves removing a portion of an existing 2.6m x…
Smeato
  • 364
  • 1
  • 12
2
votes
3 answers

Can you postcure epoxy composites outside the mold?

Say I make a fiberglass/epoxy part on a plastic mold, and it cures at room temperature. The epoxy system calls for a postcure at 250F, but the mold cannot withstand 250F. If I take off the part and postcure it separately, am I likely to see…
quantumkayos
  • 23
  • 3
1
vote
1 answer

Design a composite material with good wear resistance and electrical conductivity

For a electrical switching device which opens and closes frequently and forcefully. Would a combination of a soft polymer matrix and a conductive metal fibre be a good choice for this? While polymer in itself is not known for having good wear…
zero
  • 201
  • 2
  • 5
1
vote
2 answers

How do I calculate the structural properties of a fiberglass laminated wood panel?

I'm constructing 2.2 meters span, 1 m wide shelf. Want to make it cheap but thin. I'm planning to use 18mm thick OSB board and reinforce it with a layer of stronger material stuck to it's bottom. My first idea for reinforcement is 2 strips of 60*4…
Gleb
  • 163
  • 1
  • 7
1
vote
1 answer

How strong is the adhesion between UHMWPE Fiber and Epoxy Resin?

How strong is the adhesion between Ultra High Molecular Weight Polyethylene(UHMWPE) Fiber and Epoxy Resin normally? If we take the UHMWPE fiber sheet as it is without subjecting it to any chemical or plasma treatment (for improved surface bonding…
nihal
  • 145
  • 5
1
vote
1 answer

Impact of mold material in carbon fiber part finish

Does the material with which I make the mold for carbon fiber parts affect the finish the part will get? If it does, I would like to understand how a given material may affect the finish. Another thing that is confusing me is the exact definition of…
user1790813
  • 143
  • 6
1
2 3