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Questions tagged [composite]

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3answers
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Composite beam- increase in bending moment due to reinforced steel

While trying to solve this question and using the flexure formulas of bending for composite beams I obtained a lower value of moment for steel than for aluminum.How is that possible?
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1answer
20 views

What are equations related to the compaction of composite metal powders?

Say I am trying to create a metal composite and have a mixture of 3 different metal powders each with varying weight %'s. I'm going to compact them into the shape of a ring by applying a force P. The ...
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0answers
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How to Convert Matweb Online Datasheet into Usable ANSYS Engineering Datasource

I have a link to a composite material that I wish to import into ANSYS. http://www.matweb.com/search/datasheet.aspx?matguid=8337b2d050d44da1b8a9a5e61b0d5f85 Is it possible to convert these values: ...
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1answer
38 views

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 (...
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1answer
50 views

Why do people build the core of a sandwich structure using compsite

Usually I see composite as a laminate wrapped around the core of a sandwich structure. Usually in loading such as bending the bending stress is the highest furthest away from the neutral axis, while ...
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0answers
40 views

Buckling of composite plates help

I am trying to write code for the buckling of composite plates using the Ritz approximation but I can't understand something. According to Reddy (Mechanics of laminated composites), this is the ...
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2answers
72 views

Young's modulus for composite auxetic material

If you look at the screenshot you will see a composite auxetic material. How would you calculate the E-modulus for it? Is it as simple as the rule of mixtures, ...
0
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1answer
61 views

Why is graphlite so strong in tension?

This comes from the composites store website: These high performance carbon shapes are produced by packing a high volume of carbon fiber into epoxy resin under tension resulting in an unmatched ...
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1answer
158 views

How to calculate scarf ratio or lap overlap for composites?

I'm building a plane, and one of the solutions I've thought of for connecting the wing spars to the fuselage involves connecting carbon fiber parts. As mentioned in this answer, I found this ...
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1answer
437 views

For the machine element shown, locate the X, Y and Z coordinate of the center of gravity

QUESTION: My working: I had divided the body into 5 common shapes which are shown here: now that I'm solving for x bar, y bar, and z bar I find it difficult in finding the x, y and z directions. ...
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2answers
498 views

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 ...
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1answer
83 views

Milling aramid composites produces unwanted fuzz at surface

I use standard end mills for cutting carbon fibre sheets. Generally the cutters are 2 to 3 mm diameter, with a flute length of about 8 mm. I use 3- and 4-flute end mills. These work quite well if they ...
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2answers
204 views

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 ...
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3answers
151 views

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 ...
3
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1answer
43 views

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?
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1answer
158 views

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 ...
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2answers
426 views

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 ...
4
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1answer
508 views

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 ...
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1answer
4k views

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 ...
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1answer
438 views

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 ...
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1answer
92 views

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 ...
5
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1answer
132 views

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 ...
5
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1answer
3k views

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/...