Question Seven (Plastics)The data below is from a fibre reinforced plastic. Would this composite be suitable foruse at 400°C? Explain your answer.Temperature (°C)20100200300400500600Plastic APlastic BPlastic CYieldStrength(MPa)27035047TensileStrength(MPa)30050052E (GPa)13031411510095Question Eight (Plastics)Identify the thermoplastic, the elastomer and the thermoset.70580Young's Modulus (GPa) Elongation (%)123600

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The data below is from a fibre reinforced plastic. Would this composite be suitable for use at 400°C? Explain your answer.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A continuous and aligned fiber-reinforced composite is to be produced consisting of 30% vol aramid fibers and 70% vol of a polycarbonate matrix. Mechanical characteristics from the test are given below. The composite is characterized by mechanical testing in both longitudinal and transverse loading. Calculate the longitudinal and transverse elastic modulus. 30% vol aramid fibers (Modulus of Elasticity - 121.68 GPa) 70% vol of a polycarbonate matrix (Modulus of Elasticity - 3.42 GPa)
A composite with a vinyl ester (VE) matrix contains 2 vol% CNTS with the following characteristics: 1= 7 um, d= 50 nm, di = 4 nm, and EcCNT = 900 GPa. The modulus of the VE matrix is 1.9 GPa. %3D c. Find the Major Poisson's ratio for this composite using strength of materials approach. d. Find the in-plane shear modulus for this composite using strength of materials approach.
Q5 (a) Figure 6 shows two types of polymeric products fabricated using different processing techniques. Suggest with justification for the type of processes used to produce the products: i. Product A ii. Product B A B Figure 6. Two types of polymeric products (a) plastic bottles and (b) plastic car boot tray (b) The molecular weight data of a Polymer X are given in Table 3. Once undergone a melting process, it achieves degree of polymerization, DP of 498 upon solidification. i. Calculate the number-average molecular weight (Mn) for the polymer. ii. Calculate the molecular weight for monomers of the Polymer X. iii. Prove that the Polymer X is a polytetrafluoroethylene (PTFE) with chemical formula of (C2F4)n- Given the atomic weights for carbon, C is 12.011 g/mol and fluorine, F is 18.998 g/mol.
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
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.
(b) A continuous and aligned fiber-reinforced composite is to be produced using 45 vol% of aramid fibers and 55 vol% of polycarbonate matrix. Mechanical properties of these two materials that are given in Table Q5(b): Table Q5(b): Mechanical properties of fiber and matrix Modulus of Elasticity (GPa) Tensile Strength (MPa) Aramid Fiber 131 3600 Polycarbonate 2.4 65 If the stress on the polycarbonate matrix is 35 MPa, when the aramid fibers fail, then compute the followings: (i) the longitudinal tensile strength (ii) the longitudinal modulus of elasticity
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?
Consider a carbon fibre composite, made using an epoxy resin. The modulus of the fibres Efis 210 GPa, and the modulus of the matrix Em is 3.2 GPa. Calculate the following moduli, and choose the correct answers from the list below. Modulus of a unidirectional composite using the rule of mixtures at a volume fraction of 35% fibre. E0⁰ E0°/90° Maximum modulus of a cross-ply laminate of the material. Egº = 76.5 MPa. E0⁰ = 75.6 GPa. Eoº = 101.8 GPa. Egº = 110.2 MPa. E0°/90° = 0.3 MPa. E0°/90° = 0.5 MPa. E0°/90° = 36.8 GPa. E0°/90° = 42.5 GPa.
An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range xi 8,000 -20,000 0.05 20,000 - 32,000 0.15 32,000 44,000 0.21 44,000 56,000 0.28 56,000 -68,000 0.18 68,000 - 80,000 0.10 80,000 - 92,000 0.03 Having a DP=763, which of the following common polymers is this sample? Select one: wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol b. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol c. Polycarbonate with a monomer molecular weight of 61.0168 g/mol d. Polypropylene with a monomer molecular weight of 42.08 g/mol e. Polystyrene with a monomer molecular weight of 104.15 g/mol
The rule of mixture (ROM) for composites may be used to calculate some of the physical properties of the materials. True False
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 +
A continuous and aligned fiber-reinforced composite is to be produced consisting of 30% vol aramid fibers and 70% vol of a polycarbonate matrix. Mechanical characteristics from the test are given below. The composite is characterized by mechanical testing in both longitudinal and transverse loading. Calculate the elastic modulus of each component. Modulus of Elasticity (GPa) Aramid fibers 121.68 Polycarbonate 3.42