What is Composite: Definition and 401 Discussions

A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a material with properties unlike the individual elements. Within the finished structure, the individual elements remain separate and distinct, distinguishing composites from mixtures and solid solutions.Typical engineered composite materials include:

Reinforced concrete and masonry
Composite wood such as plywood
Reinforced plastics, such as fibre-reinforced polymer or fiberglass
Ceramic matrix composites (composite ceramic and metal matrices)
Metal matrix composites
and other advanced composite materialsThere are various reasons where new material can be favoured. Typical examples include materials which are less expensive, lighter, stronger or more durable when compared with common materials.
More recently researchers have also begun to actively include sensing, actuation, computation and communication into composites, which are known as robotic materials.Composite materials are generally used for buildings, bridges, and structures such as boat hulls, swimming pool panels, racing car bodies, shower stalls, bathtubs, storage tanks, imitation granite and cultured marble sinks and countertops. They are also being increasingly use in general automotive applications.The most advanced examples perform routinely on spacecraft and aircraft in demanding environments.

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  1. A

    I Composite Galilean transformation in 2 dimensions

    The Galilean transforms for rotations, boosts and translations in 2D are the follows: Rotations: x' = xcosθ + ysinθ y' = -xsinθ + ycosθ Boosts: x' = x - vxt y' = y - vyt Translations: x' = x - dx y' = y - dx I wanted to combine these into a single pair of equations, so my first thought was...
  2. Kevin McHugh

    Composite Metal Foams: Learn More About These Fascinating Materials

    https://www.yahoo.com/news/watch-metal-foam-dissolves-bullet-182400907.html These materials look really interesting. I'd like to learn more about them, anybody familiar with these materials?
  3. E

    Gases that absorb IR radiation

    Hello, I'm looking for a gas (hopefully one that is readily available) that will absorb Nd:YAG laser radiation at 1064 nm. The purpose is to heat the gas to transmit heat into a glass fiber composite which normally does not absorb IR light.
  4. A

    Ansys workbench Composite Analysis

    Hello All, I am a master student working on my thesis. am using ANSYS workbench to model the debonding between FRP and Concrete (Single Shear Test). The geometry is very simple, so meshing and sketching were easy. however I have the following quires about loading and interfaces. 1. I want to...
  5. A

    B Monotony of composite functions

    So, it is known and easy to prove that if you have f : D -> G and g : G -> B then -if both f and g have the same monotony => fοg is increasing -if f and g have different monotony => fοg is decreasing But the reciprocal of this is not always true (easy to prove with a contradicting example)...
  6. M

    Chain Rule W/ Composite Functions

    Homework Statement If d/dx(f(x)) = g(x) and d/dx(g(x)) = f(x2), then d2/dx2(f(x3)) = a) f(x6) b) g(x3) c) 3x2*g(x3) d) 9x4*f(x6) + 6x*g(x3) e) f(x6) + g(x3) Homework EquationsThe Attempt at a Solution The answer is D. Since d/dx(f(x)) = g(x), I said that d/dx(f(x3)) should equal 3x2*g(x3), then...
  7. S

    How can I properly add plies to a composite leaf spring in ANSYS APDL?

    Hi, I'm analyzing a composite leaf spring using ANSYS APDL, the leaf spring has a thickness of 12mm, and since it is a composite material, it is composed of many plies, I'm assuming the ply thickness to be 0.125mm. I imported the geometry as a Parasolid x_t. And the element type I used is...
  8. AdamMcParland

    Integrating Multiple Young's Moduli in Composite Beam Design: Tips and Tricks

    Having trouble figuring out how to link the two Young's Moduli to the Bending Moment, any suggestions?
  9. vetgirl1990

    Moment of inertia for composite objects

    Homework Statement Find the moment of inertia of these composite objects. I've attached two different composite objects; each rod has length L and mass M. Homework Equations I = Icm + MD2 Long thin rod with rotation axis through centre: Icm = 1/12ML2 Long thin rod with rotation axis through...
  10. vetgirl1990

    Moment of inertia for composite object

    Homework Statement Find the moment of inertia for this composite object: M1=5kg at (3,4) and M2=3kg at (6,8) Homework Equations Moment if inertia for point particle = MR2 The Attempt at a Solution I'm not sure if moment of inertia should be componentized -- broken up into x and y...
  11. W

    How Is the Centroid of a Composite Area Calculated Incorrectly Here?

    Homework Statement As in the photos Homework EquationsThe Attempt at a Solution my working is (6.43x10^-3)(310+10) + (11x10^-3)(155) / (6.43x10^-3 +11x10^-3 ) = 215.8 , but the ans is 112 , what's wrong with my working ?
  12. P

    Heat flux through a composite wall

    1. State the problem A plane wall consisting of three different materials, each of constant thermal conductivity k. Assume steady-state temperature distribution. a) Comment on relative magnitudes of q(dot)''2 and q(dot)''3 and of q(dot)''3 and q(dot)''4. b) Comment on the relative...
  13. G

    What is the Correct Calculation for Centroid of Composite Area?

    Homework Statement i have a few question here . 1. the y bar for I should be 16.98, am i right ? 2. The y bar for II should be 50+12+24=86 , am i right ? 3. the x bar for V should be 50 , am i right ? Homework EquationsThe Attempt at a Solution
  14. J

    How Can I Verify My High Velocity Impact Test Results?

    Hi all, I am doing a High Velocity Impact testing using a gas gun I have to figure out a) is my test running well and I am not getting any reflection? Please correct me or help in calculating if I am wrong at any point. I guess, I can figure out by calculating the time required for the...
  15. Garlic

    Cherenkov radiation from neutral composite particles

    Hello everyone, Can atomic or subatomic neutral composite particles that consist charged particles emit cherenkov radiation if they are polarised strongly enough (and are fast enough)?
  16. throneoo

    Argument against quarks being composite particles?

    So during a particle physics lecture, the lecturer used Heisenberg's uncertainty principle to set a lower limit on the KE of the quarks bound in a proton (given the mass,size of proton and the mass of u/d quarks), which is of the order of 100 MeV, while the mass of quarks is about several...
  17. M

    Composite Gauge Bosons: Supersymmetric SU(4) Example

    Buried in a recent talk by John Ellis, the following passage: Reference 92 is Weinberg & Witten 1980, reference 93 is a talk by Zohar Komargodski at the same meeting.
  18. RLewis42

    Value of composite metal beams?

    It has been my understanding when working with natural wood beams/joists, that for example, two 2x12 members over a 12' span gain significant strength when they are fastened (nailed, glued or both) together rather than just lying side by side touching one another. Is this phenomenon...
  19. jdawg

    Moments of Inertia for Composite Area

    Homework Statement Determine the moment of inertia of the cross sectional area of the T beam with respect to the x' axis passing through the centroid of the cross section.(I'm attaching a diagram) Homework EquationsThe Attempt at a Solution Hi! I'm having a little trouble with this problem...
  20. Andy Resnick

    Milky Way Composite: Vacation Night Photo

    Just got back from vacation on the beach, there was one clear night which I used to do this (15mm lens): It's a composite (duh..) of long exposures for the trails (about 4 minutes each, ISO 800), with a burst of 13-second ISO 2000 images in the middle which are stacked. The humidity created...
  21. RLewis42

    Calculating Composite Center of Gravity -- Boat Rack for my Truck

    Hi, I'm new here, great forum! I am building a boat rack for the top of my truck for a particular boat and boat dolly. The boat will be upside down with the beach dolly attached. It is a side loader, so balance is critical. I need to calculate the combined Center Of Gravity (COG) of the boat...
  22. I

    (Composite) In plane principal stress or normal stress?

    Hey everybody, I went through a discussion with a colleague today about Finite element modeling of composite structures and how to interpret the stress analysis. I understand that for isotropic materials, principal stresses could be used against the allowable stresses to see if failure will...
  23. B

    Tensile Test Specimen Point of Failure

    I am a part C Mechanical Engineering student and have been undertaking a project investigating the strain sensitivity of a particular glass filled composite. From my quasi-static results, the stress-strain curves seem to be reasonable and match that of the mechanical material properties...
  24. K

    Theory behind ANSYS composite Pre-Post(ACP)

    what theory that ACP is used?
  25. D

    Composite Functions, please confirm

    New to composite functions here. Lesson has been vague and unhelpful.. again. Here is what I've worked on so far but not sure on the last equation in particular, or that I have done my multiplication properly when working with a squared set of brackets, multiplied by an number.. (b and c) Any...
  26. S

    Limit of Composite Function

    I need help with the following theorem: Let I, J ⊆ℝ be open intervals, let x∈I, let g: I\{x}→ℝ and f: J→ℝ be functions with g[I\{x}]⊆J and Limz→xg(x)=L∈J. Assume that limy→L f(y) exists and that g[I\{x}]⊆J\{g(x)},or, in case g(x)∈g[I\{x}] that limy→L f(y)=f(L). Then f(g(x)) converges at x, and...
  27. CAH

    Domain and range of composite functions?

    hey! How do you work out the domain and range of fg(x), do you work out what range of g(x) will fit the domain of f(x)? I have no clue. Thanks
  28. P

    Longtime lurker here, composite function problem

    Homework Statement Let f(g(h(x))) = 1/(2-x) Find g(x) if: f(x) = (x^2) - 1 h(x) = 3x+12. The attempt at a solution This is what I have: g(h(x))^2 -1 = 1/(2-x) g(h(x) = sqrt((3-x)/(2-x)) I'm not sure how to get the h(x) out of this to leave me with just g(x). Please point me in the right...
  29. R

    Making a Nylon - Fibre Composite

    Hi, I was tasked to design a composite material that will undergo a 3 point bending test. Maximum deflection will be of 15mm and a maximum load of 5kN. The scope of this task is not to prevent failure but to analyse the composite and learn from the design process. Nonetheless the composite...
  30. N

    Why Are My Composite Function Solutions Incorrect?

    Homework Statement 1. Find a formula for (f g)(x) = ? 2. Find a formula for (f f )(x) = ? 3. Find a formula for the composition below. g(h(x)) = 4. Find a formula for the composition below. (h g)(x) =The Attempt at a Solution 1. f(g(x)) 2. f(f(x)) 3. (g º h)(x) 4. h(g(x)) Why are these...
  31. TrickyDicky

    Localization of states and elementary vs composite in QM

    While browsing Wikipedia I bumped into this sentence that seemed partially wrong to me but maybe I didn't understand what it is referring to so would like for some expert to help me elucidate it: "Even if an elementary particle has a delocalized wavepacket, the wavepacket is in fact a quantum...
  32. Ventrella

    What Is a Composite Number With No Co-Prime Factors?

    I have come across a question in my explorations of recursive tilings using Gaussian and Eisenstein Integers. It seems there might be a class of composite numbers which have no factors (divisors) that are co-prime. So, for instance: 10 is composite, but its factors (2 and 5) are co-prime. The...
  33. D

    What does the [2/4/4/2] notation in composite ply layup represent?

    Hi, I've come across this notation to describe a composite ply layup: [2/4/4/2] – [45/0/-45/45/90/-45]s I know that the second part is notation for: [45/0/-45/45/90/-45/-45/90/45/-45/0/45] But what is the [2/4/4/2] in referrence to? I have noticed that 2+4+4+2 = 12, and there are 12 ply...
  34. F

    Exploring the Potential of Quantum Tunneling Composites for Load Cell Technology

    Is it possible to build a fast, accurate scale using QTC? If so, could someone explain the basics or point me toward a good resource? Thanks!
  35. R

    Understanding Composite Laminate Stresses

    Hi Guys I am trying to figure out what stresses in different planes mean physically for composite laminates. Say S stands for stress then SXX SYY SZZ would be longitudinal/axial stresses in respective Axes. (If we take the laminates to be in XY plane, failure stress SZZ would be equal to...
  36. anemone

    MHB How can factorization prove the compositeness of a given expression?

    Prove that for every positive integer $a$, the integer $5^{4a}+5^{3a}+5^{2a}+5^a+1$ is composite.
  37. M

    What is differential of Alloy and MMC?

    We can find differential of alloy and composite. MMC is came from 2 differential of metal, one from it aren't melting same as producing alloy. but there are might produce new reaction. ex: C with Fe, the name is carbon steel. the nano-composite just too, but the particle aren't big, and the size...
  38. Z

    Material with specific elec. conductivity

    Dear Friends, I am working on a project in which we need to shield an electrical field with a heavy 1 MHz component, at the same time, sparing the magnetic field as much as we can. With our limited knowledge, we came to the conclusion that a material with 10 kOhm conductivity would do this...
  39. L

    Calculating Tension Loads in Composite Bars

    How do you calculate total extension of composite bars carrying loads in tension?
  40. L

    Young's Modulus of a Composite

    Homework Statement Glass fibres in Nylon provide reinforcement. Young's modulus of glass fibre is 72.4GPa; Young's modulus of Nylon is 2.8GPa. If the Nylon contains 30% by volume glass fibres, what fraction of the force applied parallel to the fibre axis is carried by the glass fibre? (Assume...
  41. J

    Composite object resting on a horizontal plane

    A solid hemisphere has another, smaller solid hemisphere attached to each other at their plane, circular faces, so that the centre C of the circular bases of either coincide. A particle P is then attached to the edge of the plane circular face of the larger hemisphere. The composite object is...
  42. P

    2D Milne's rule composite integration

    http://en.wikipedia.org/wiki/Newton%E2%80%93Cotes_formulas Simpson rule: 1 4 1, and the composite version: 1 4 2 4 2 4 2 4 ...4 1 in a double integral we just compute rows, and next columns, a this gives a matrix: http://mathfaculty.fullerton.edu/mathews/n2003/SimpsonsRule2DMod.html Milne's...
  43. S

    Expectation Value of Composite System

    Homework Statement System of 2 particles with spin 1/2. Let \vert + \rangle = \begin{pmatrix} 0 \\ 1 \end{pmatrix} \\ \vert - \rangle = \begin{pmatrix} 1 \\ 0 \end{pmatrix} singlet state \vert \Phi \rangle = \frac{1}{\sqrt{2}} \Big( \vert + \rangle \otimes \vert - \rangle - \vert - \rangle...
  44. T

    Composite wire section as it relates to induction

    Stuff I'm wondering about: * can/does a conductors' cross-section influence inductive efficiency and/or directionality? * consider a 'wire' made from a dielectric material, with a conductive material evaporatively deposited on it's surface. if this wire were asymmetrical in section, e.g. it...
  45. I

    Domain of a composite function

    Homework Statement Given the Functions f(x)=4x-1 g(x)=3-2x^2 h(x)= sqrt (x+5) What is the domain of h(g(x))? Homework Equations the subject is finding the domain of a composite function The Attempt at a Solution I don't understand what I have to 'bring over' from g(x). I think x cannot equal...
  46. gfd43tg

    Heat flow through composite material

    Homework Statement The cross section of a 20 cm thick, 3 m wide, and 1 m high composite wall is shown. The conductivities of materials A, B and C are 1.0, 0.1, and 0.05 W m-1 K-1, respectively. One side is exposed to air at 295 K with a heat transfer coefficient of 4 W m-2 K-1, and the other...
  47. S

    Combined Loads (forces and moments) on composite lamina

    Homework Statement I have a laminate subject to 3 forces and 3 moments: Nx = normal force resultant in the x direction (N/m) Ny = normal force resultant in the y direction (N/m) Nxy = shear force resultant (N/m) Mx = Bending moment resultant in the x direction (Nm/m) My = Bending moment...
  48. arivero

    Supersymmetric Composite Models

    I have just found a review on this topic by Volkas and Joshi http://inspirehep.net/record/21549?ln=esBut it is very old... 1988. I was just in the middle of the undergraduate. I know that the topic got some push from Seiberg dualities, but that is still the XXth century. Does anybody know of...
  49. A

    Are composite particles, like atoms, identical bosons/fermions?

    I have seen only two arguments for the fact that composite particles, like protons, nuclei, or even Helium-4 atoms, are identical and can be considered bosons or fermions according to their total spin. The first, in Feyman's lectures [third volume, 4-2]. It is said that if the composite...
  50. A

    MHB Exponential Growth And Composite Functions

    Hey guys, Few more questions for the problem set I've been working on. I'm doubting some of my answers and I'd appreciate some help. Question: The first one starts off easy but I found that it gets progress more challenging later on. So the rate of spread should be p'(t) which is: p'(t) =...
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