Mech 425 assignment 2

Kindly solve it completely by hand if possible.

Can someone assist me please? Thanks.

ii) A continuous and aligned glass fiber-reinforced composite consist of 40 vol% of glass fibers having a modulus of elasticity of 69 GPa and 60 vol% of polyester resin that, when hardened, displays a modulus of 3.4 GPa. Find the modulus of elasticity of this composite in the longitudinal direction.

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

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

d) A carbon fibre reinforced composite is made using a volume fraction of 77% carbon. The material properties of the constituent materials are listed below: E (GPa) Strength (MPa) 1500 900 Carbon fibre Epoxy 60 3 The composite is loaded in tension and a Young's modulus of 12.9GPa is measured. Is this the maximum modulus the composite can experience? Explain your answer. For a modulus of 12.9GPa, can the strength be estimated? Explain your answer. Relevant formulae: (4 marks) 1 E Vf E₁ 'm Em E = EfVf + EmVm o = ofV₁ + 0mVm +

1 An engineer is to use recycled polymer in their car mirror covering. Which of the following would be the best polymer to recycle? (A) Bakelite (B) Carbon Fibre (C) Polypropylene (D) Urea Formaldehyde albe unioonign3

Compression molding is a manufacturing process in which the molding material is preheated then placed in an open mold cavity where the compressive action of the punch forces the polymer into the desired shape as shown in the figure below. Based on your understanding of the behavior of polymers, which of the statements below regarding compression molding of polymers are accurate? Punch Cavity C. -Upper mold half Charge 41 (1) -Lower mold half Knock-out pin V, F |x.F (2) and (3) Molded part a. Lower operating temperatures are more desirable as they reduce viscosity making it easier to fill the cavity b. This process can only be used for thermosets as they can thermally cure from monomer state This process can be used for both thermosets and thermoplastics as they can both be thermally shaped d. This process is suitable for rubber, PVC and polymethyl methacrylate

Answer whats in the image, please and thank you

Connecting rod (as shown below) is a car part that connects engine piston to crankshaft and converts reciprocating motion into rotating motion. It performs under load at high temperature around 150°C. Long carbon fiber thermoplastic composite (LFT) with 30% carbon fiber has been considered to replace metal (steel or aluminum) rod to improve efficiency.    Based on the data for different polymers listed in the table above, which polymer(s) would you choose as the polymer matrix for the connecting rod? What is your rationale?

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.

Calculate the modulus of rigidity (shear modulus) of an epoxy resin if the modulus of elasticity (Young's modulus) E = 3.5 GPa and the Poisson's ratio = 0.35. Select one: a. G = 2.6 GPa b. G = 10 GPa c. G = 3.15 GPa d. G= 0.1 GPa e. G = 1.3 GPa

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

Molecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is 710, which one of the polymers listed in Table 14.3 is this polymer? Why? Molecular Weight Range g/mol 15,000-30,000 Xi Wi 0.04 0.01 30,000-45,000 0.07 0.04 45,000-60,000 0.16 0.11 60,000-75,000 0.26 0.24 75,000-90,000 0.24 0.27 90,000 105,000 0.12 0.16 105,000-120,000 0.08 0.12 120,000-135,000 0.03 0.05

Course: Engineering Materials

Please

Which of the following are incorrect regarding the crystallinity and mechanical behavior of polymers? a. Strain softening happens in elastomers where the deformation gradually leads to a decrease in stiffness under constant strain rate b. As temperature is reduced, necking behavior of plastic tensile bars completely disappears C. The stress-strain curve slope for totally elastic and brittle polymers is always positive d. Heat treatment always results in enhanced polymer strength, modulus, and brittleness e. Semi-crystalline polymers are heat treated to increase crystallinity and improve strength f. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus, and ductility in semi-crystalline polymers

Which of the following is incorrect regarding the degree of crystallinity of semi-crystalline polymers? (This question has more than one correct answer) a. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus and ductility in semi-crystalline polymers b. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength c. The tendency of a polymer to crystalize decreases with increasing molecular weight d. Heat treatment always results in enhanced polymer strength, elastic modulus and brittleness

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