A composite material reinforced with aligned fibers, consisting of 20% by volume of siliconcarbide (SiC) fibers and 80% by volume of polycarbonate (PC) matrix. The mechanicalcharacteristics of the 2 materials are in the table. The stress of the matrix when the fiberbreaks is 45 MPa. Calculate the longitudinal strength?SiCPCElastic modulus (GPa) Tensile strength (GPa)4002,43,90,065

Answered: A composite material reinforced with…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter34: Miscellaneous Separation Methods

Section: Chapter Questions

Problem 34.14QAP

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Figure 1 shows the stress-number cycles to failure (S-N) curve for a cylindrical acetal polymer bar. The cylindrical bar is 200 mm long and 15 mm in diameter is subjected to a vibrational load at one end of the bar at a frequency of 500 vibrations per minute with a load of 50 N. 60 50 8 Stress amplitude (MPa) 30 20 10 105 106 107 108 Cycles to failure Figure 1: The S-N fatigue curve for an acetal polymer. 104 (i) Evaluate the duration (in hours) the part will survive before breaking? (ii) Suppose the cylindrical bar is to survive for one million cycles under conditions that provide for equal compressive and tensile stresses. Evaluate the maximum stress, the minimum stress, and the mean stress on the part during its use. Explain the effect of frequency on the stress application would have on your answers.
Click and drag from the options below to complete these sentences. Answers may be used more than once. In a continuous fibre reinforced composite where the fibres are well aligned, the strength in the transverse direction will be the strength in the longitudinal direction. The stiffness of the composite in the transverse direction will be the stiffness in the longitudinal direction. greater than similar to less than
2. A three-point loading scheme for measuring the stress-strain behavior and flexural strength, σF, (stress at fracture) of brittle ceramics for rectangular and circular cross sections materials are shown below. 3FfL = πR³ 2bd2 (depending on the FfL The flexural strength σF, can be calculated as: σFƒ cross section shape). = Calculate the ceramic flexural strength when Fƒ=1030 N, L=3.5 cm and 2R=b=d=1 cm and define which structure is stronger. Show your work. Note when you calculate, don't forget to unit conversion! Ff R Compression Tension
MARCH 2017 A unidirectional carbon-fiber-epoxy-resin composite consists 65% by volume of carbon-fiber and 35% of epoxy-resin. The density of the carbon-fiber is 1.8 g cm³ and that of the epoxy-resin is 1.2 g cm³. Calculate the weight percentages of carbon-fibers and epoxy-resin in the composite. (Ans: 26.4 %)
Polymeric composite materials can be obtained by adding fillers in the form of particles or fibers in a polymeric matrix and are intended to form a new material with properties different from those of pure components. Regarding polymeric composites, review the statements below and check which is true and which is false. (I) The mechanical properties of a fiber reinforced polymer composite are not influenced by fiber length. (II) Composites with unidirectional continuous fibers have isotropic mechanical properties. (III) The interfacial adhesion between matrix and dispersed phase does not influence the magnitude of the final mechanical properties of the composite. (IV) In polymeric composites, fibers are normally less ductile than polymeric matrices. (V) The specific area of a material at the nanoscale is significantly less than the specific area of the same material at the microscale.
Note this is material science question
4. Evaluate the strain hardening increment to the yield strength of Li [BCC, G (shear modulus) = 32 GPa, a (lattice constant) = 3 Å] alloy with a microstructure due to a dislocation density of 3x1013 m-2. Make appropriate assumptions, if any.
A thin film of Co was deposited on the end of a long cylinder of Fe3O4. Afterwards, the cylinder was annealed for 20 hours and then the Co concentration was measured. The Co concentration values are given in the table. Calculate the diffusion coefficient of Co in Fe304 at the annealing conditions. x (um) C(x, t) (mol/cm³) 20 7.78x10-4 40 7.33x10-4 60 6.64x10-4 80 5.78x10-4
A strip of elastomer was stretched in tension and elongation was held constant. After 10min the tensile stress in the specimen dropped by 12%. Assuming that the elastomer behavesin accordance with the Maxwell model:• calculate the relaxation time (to the nearest whole number) (answer: τ = 78 min)• show that it takes 22 min for the stress to drop to 75% of its initial value.
Indicate which option is false(A). Resistivity has a residual component and a thermal component.(B). In some materials resistivity increases with T and in others it decreases.(C). In insulating materials, resistivity is very low.
Explain the tables shown.
The following is a backscattered electron image of a sample of nickel alloy particles that were embedded in a resin, cut, and then polished to reveal the internal structure of the particles. From the image, explain whether you think the alloy has uniform composition or whether it is segregated into phases of different compositions. The resin used for embedding is an electrical insulator. How should such samples be treated before they are examined by SEM?

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