A composite material reinforced with aligned fibers, consisting of 20% by volume of silicon carbide (SiC) fibers and 80% by volume of polycarbonate (PC) matrix. The mechanical characteristics of the 2 materials are in the table. The stress of the matrix when the fiber breaks is 45 MPa. Calculate the longitudinal strength? SiC PC Elastic modulus (GPa) Tensile strength (GPa) 400 2,4 3,9 0,065
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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 thanMARCH 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 %)
- 6 Commercial resistors can be produced by evaporating a controlled amount of carbon onto a ceramic support structure. The carbon is often patterned into a curvy line to fit more length -D onto the surface. What thickness of carbon (in μm) should be deposited to produce a resistor of 3.50 k if the length of the line is 2.50 cm and the width is 67.6 μm? Type your answer....Template Assisted Crystallization (TAC) is a a commercial softening alternative. Which of the following description is wrong O A. TAC involves the adsorption of cations and anions O B. TAC involves the crystallization of hardness ions O C. TAC involves the detachment of nanocrystalls back to the treated water O D. TAC has a greater removal efficiency for hardness than RO or ion exchangeA specimen of a 4340 steel alloy having a plane strain fracture toughness of 45 MPa sqrt(m) (41 ksi sqrt(in)) is exposed to a stress of 1000 MPa (145,000 psi). Will this specimen experience fracture if it is known that the largest surface crack is 0.75 mm (0.03 in.) long? Why or why not? Assume that the parameter Y has a value of 1.0.
- 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 5.78x10-4A 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.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?Stationary phase/s that can be used for both HILIC and NPLC Diol Cyano Unmodified silica Phenyl-bondedMacromolecules containing fibrous inorganic and organic fillers in polyolefins like polypropylene and in other semi-crystalline plastic polymers molded under stress or orientated (stress induced) will form trans. crystals epitaxially on the fiber surface in-situ in the polymer matrix. However, without fiber fillers in these same matrix no trans. crystals are formed. If transcrystallinity could be induced in unfilled semi-crystalline molded plastics what would be the outcomes observed in the molded part. What physical chemical changes versus a control molded sample of the same material not be trans. induced? Has the field of polymer science and physical been able to model or predict what factors induce either alpha transcrystallinity or beta transcrystallinity?