MMET 206 Lab Report No 7

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How may acoustic designers alter the design of a room, which was previously used for music performances, into a room now to be used for spoken word performances? Use annotated diagrams for your response. For the answer please include the different materials used in the different settings. I.e what designs and materials will be used for a music room vs a speech room.

During the selection of material, the availability of material is not an important factor. Select one: O True O False e ngineering Materials- Assignment Jump to..

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can you help me answer this question and explain the steps you took to get to the answer i  am stuck between B and D as the answer

d) A number of [0]s and [0,90]s CFRP test specimens were made from prepreg material with the following properties: Fibre strength, of = 3250 MPa Fibre modulus, E₁ = 195 GPa Matrix strength, m = 35 MPa Matrix modulus, Em = 3.8 GPa Volume fraction of fibres, Vf = 0.65 Calculate the tensile strength, oc, and the tensile modulus, Ec, in the 0° and 90° directions, using the simple "rule of mixtures" approach for both the [0]s and [0,90]s specimens.

In your summer internship, you are tasked with measuring the ultimate tensile strength of a material to determine if it meets your company’s (Superior Super Ships Inc) specification. Your boss is worried that the new low-cost supplier, Shoddy Alloys Inc, may not be reliable but it is the only way to source on-time the SS304 needed to make finishings for Jeff Bezos’ new yacht, the Black Pearl. You collect several load versus displacement curves, as illustrated below. The initial diameter of the round gauge section is 0.25 in. You also collect the instantaneous diameter of the specimen during the test using a laser. Using the provided data, calculate what is the ultimate tensile strength measured in this test?

Please do not give a typedout answer. They are hard to follow/read. Please write it out, draw a FBD if needed, Thank you

Please make sure to display your thought process? It is imperative to be able to follow how the answer was deduced. Please be as thorough as possible. Please address all parts of this question as they are all part and critical to answering this question correctly. Please show good integrity when answering the question: Strain-rate, temperature, pressure, and aging time all affect the stress/strain behavior of polymers. Draw a stress-strain curve below for a typical ductile polymer. Clearly label the yield point and the ultimate tensile strength. Using this curve draw two new curves corresponding to same polymer but now tested at: 1) an increase in temperature and 2) an increase in strain rate. Explain what happens to the tensile behavior after: a) a prolong time of aging time is increased and b) when the tensile tests are conducted under super imposed hydrostatic compression

Question 1 A composite material consists of 40% parallel carbon fibres with a Young’s modulus of 405 GPa in a matrix of epoxy resin with a Young’s modulus of 2.5 GPa. Calculate the Young’s modulus of the composite in the parallel and in the perpendicular directions of the fibres. Use the graphical method seen in class to show the possible value of the overall young modulus of your composite material.

solve 30-40 minutes hand written asap..i'll rate

Solve 30-40 minutes hand written asap..i'll rate

1) Samples of ceramic insulators are tested for toughness and hardness. The results from 100 samples are summarized as follows: Toughness high low high 71 8 Hardness low 17 4 Find the number of ceramic insulators that satisfies each of the following conditions: a. high hardness and low toughness b. high hardness or low scratch resistance c. low hardness or low scratch resistance

9. A polymer sample with an original length of 10 cm and cross- sectional area of 1 cm² is subjected to a tensile test. The force applied to the sample is recorded at different elongations, and the following data is obtained: Force (N) Elongation (cm) 0 100 200 300 400 500 0 1 2 3 4 5 Using this data, calculate the modulus of the polymer sample in units of Pa.

A wood composite was created to enhance the property of the common wood (control). Both samples underwent compression loading test. The result is shown in the accompanying figure. Which of the statement below is true? The elasticity of the wood composite is far better than the control The wood composite exhibit better resistance against deformation The wood composites showed a deformation behavior generally similar to that of untreated wood. After the yield point the composites showed an initially abrupt and then steady decrease in compressive stresS All of the above

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An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range 8,000 - 20,000 20,000 - 32,000 32,000 - 44,000 44,000 - 56,000 56,000 -68,000 68,000 -80,000 80,000 - 92,000 Having a DP=763, which of the following common polymers is this sample? Xi 0.05 0.15 0.21 0.28 0.18 0.10 0.03 Wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 Select one: O a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol O b. Polystyrene with a monomer molecular weight of 104.15 g/mol Polycarbonate with a monomer molecular weight of 61.0168 g/mol O c. O d. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol Polypropylene with a monomer molecular weight of 42.08 g/mol O e.

Q1.  Imagine you are working for an automotive manufacturer and are selecting plastic materials for various components. Draw the structure of a material you might use for a soft touch plastic. Now draw the structure of a material you might use in the drive train (i.e., an engineering plastic). What characteristics are you engineering into the material?   Q2. Based on what you know about the calorimetry of melting and crystallization, do you expect melting to be endothermic or exothermic? What about condensation? Can we say anything general about heat flow in the process of forming bonds, covalent or van der Waals?

Write down a proper material for each structures given below. A pipe for water Material: Reason: exchange The nose section of an Material: aircraft fuselage Reason: The spar of an aircraft Material: wing Reason: Turbine blades of a Material: turbojet engine Reason: The skin of an aircraft Material: fuselage Reason: The structure of interior Material: furniture in aircraft cabins Reason: Material: The gearbox of a helicopter Reason: The front tips of a space Material: shuttle surface Reason:

An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range Xi Wi 8,000 – 20,000 0.05 0.02 20,000 – 32,000 0.15 0.08 32,000 – 44,000 0.21 0.17 44,000 – 56,000 0.28 0.29 56,000 – 68,000 0.18 0.23 68,000 – 80,000 0.10 0.16 80,000 - 92,000 0.03 0.05 What would the weight average molecular weight of the sample be if, we had filtered the monomer mixture with a 44 kDa dialysis tubing before preparation? (Hint: a dialysis tubing of a known molecular weight, only keeps molecules larger than that size)

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A large-particle composite consisting of tungsten particles within a copper matrix is to be prepared. If the volume fractions of tungsten and copper are 0.70 and 0.30, respectively, a) Compute the modulus of elasticity of this composite in the longitudinal direction. (The upper limit) and the modulus of elasticity in the transverse direction. (The lower limit), given the data that follow. Modulus of Elasticity (GPa) Copper 110 Tungsten 407 b) If the cross-sectional area is 280 mm2 and a stress of 60 MPa is applied in this longitudinal direction, compute the magnitude of the load carried by each of the fiber (tungsten) and matrix (copper) phases.

Imagine you are a Mechanical Materials Engineer working at Mazoon Electricals Company. You are assigned to select suitable material for the body of a three-pin electrical plug. Select a suitable material based on the design specification and selection criteria.

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I need to solve D,E,F