Table 16.4 Characteristics of Several Fiber-Reinforcement MaterialsTensile Strength[GPa (10° psi)]SpecificStrength(GPa)Modulusof Elasticity[GPa (10° psi)]SpecificModulus(GPa)MaterialSpecific GravityWhiskersGraphite2.2209.1700318(3)(100)Silicon nitride3.25–71.56–2.2350–380109–118(0.75–1.0)(50–55)Aluminum oxide4.010–202.5–5.0700–1500175–375(1–3)(100–220)Silicon carbide3.2206.25480150(3)(70)FibersAluminum oxide3.951.380.3537996(0.2)(55)Aramid (Kevlar 49)1.443.6–4.12.5–2.8513191(0.525–0.600)(19)Carbon“1.78–2.151.5–4.80.70–2.70228–724106–407(0.22-0.70)(32–100)E-glass2.583.451.3472.528.1(0.5)(10.5)Boron2.573.61.40400156(0.52)(60)Silicon carbide3.03.91.30400133(0.57)(60)UHMWPE (Spectra 900)0.972.62.68117121(0.38)(17)Metallic WiresHigh-strength steel7.92.390.3021026.6(0.35)(30)Molybdenum10.22.20.2232431.8(0.32)(47)Tungsten19.32.890.1540721.1(0.42)(59)"As explained in Section 13.9, because these fibers are composed of both graphitic and turbostratic forms of carbon,the term carbon instead of graphite is used to denote these fibers. 16.6 For a glass fiber-epoxy matrix combination, the● critical ratio of fiber length to fiber diameter is40. Using the data in Table 16.4, determine thefiber-matrix bond strength.

Given data, Fiber length to diameter ratio ie. K= L/d= 40

Answered: 16.6 For a glass fiber-epoxy matrix…

16.6 For a glass fiber-epoxy matrix combination, the critical ratio of fiber length to fiber diameter is 40. Using the data in Table 16.4, determine the fiber-matrix bond strength.

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

See similar textbooks

Similar questions

An epoxy (E=2.7GPA) is reinforced with carbon fiber with module of elasticity equal to 260 GPa. Design a composite with a longitudinal elastic modulus of 160 GPa. Select one: a. Vm = 70 vol%, Vf = 30 vol% b. Vm = 40 vol%, Vf = 50 vol% C. Vm = 39 vol%, Vf = 61 vol% d. Vm = 62 vol%, Vf = 38 vol%
8.2 Estimate the thermal conductivities of choice chuck steak (82% lean) for heat transfer parallel to the fibers and for heat transfer perpendicular to the fibers. Assume the temperature of the steak is 20°C.
Alice is conducting a tensile test on continuous fiber alignment compositesamples. She found that the results are different in the longitudinal andtransverse directions of the samples. Explain why this happens with the aid ofdiagram.
16) Composite material with plastic as a matrix material can be used as biomaterials Select one: True False
1) Assume that a lamina is made using glass fiber and epoxy with the following properties: Er = 74 GPa, v, = 0.27 Em = 6.3 GPa, vm = 0.31 a) Using Rule of Mixtures, calculate and plot the elastic properties of the lamina (E1, E2, G12, v12 ,V21) as a function of fiber volume fraction. b) Comment on the observed trends and maximum values of these properties as a function of volume fraction
Question 2: A GFRP product is made from: 7.0 mm long by 0.002 mm diameter aligned fibres with Ef =72.5GPa and a tensile strength of 3.5GPa, and a matrix material with Em=1.6GPa and a tensile strength of 41.4MPa. The stress in the matrix at the fibre fracture strain is 20MPa. a) If the shear strength of the fibre-matrix bond is τc=10MPa then determine the longitudinal composite strength (σ∗) when the GFRP is made with ϕf=0.4. b) Determine the stiffness of this GFRP product in the longitudinal and transverse directions. c) If it were possible to modify the design of this GFRP product, determine the volume fraction of fibre that would be needed to achieve a strength (σ∗) of 2000MPa
Explain the following fiber Materials in detail. (i) Aramid Fibers (ii) Alumina (iii) Carbon Fiber
14.4 (a) Compute the repeat unit molecular weight O of polypropylene. (b) Compute the number-average molecular weight for a polypropylene for which the degree of polymerization is 15,000.
Continuous and aligned fiber-reinforced composite with cross-sectional area of 330 mm² (0.51 in.²) is subjected to a longitudinal load of 49200 N (11100 lbf). Assume Vf=0.3, Vm = 0.7, Ef= 131 GPa and Em = 2.4 GPa. (a) Calculate the fiber-matrix load ratio. (b) Calculate the actual load carried by fiber phase. (c) Calculate the actual load carried by matrix phase. (d) Compute the magnitude of the stress on the fiber phase. (e) Compute the magnitude of the stress on the matrix phase. (f) What strain is expected by the composite? Part 1 Calculate the fiber-matrix load ratio. M Save for Later Part 2 What is the load, in N, carried by the matrix and the fibers? (a) What is the matrix load in N? i (b) What is the fiber load in N? i N N Attempts: 0 of 3 used Submit Answer
1. Explain with drawing the addition polymerization for PVC.
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