If a load is static or varies very slowly over time and is applied uniformly over a cross-section or surface of a component, the mechanical behavior can be determined by a simple stress-strain test. Is this correct?
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If a load is static or varies very slowly over time and is applied uniformly over a cross-section or surface of a component, the mechanical behavior can be determined by a simple stress-strain test. Is this correct?
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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.Draw stress strain curve for an amorphous polymer at operating temperature T (on same plot) a. T« Tg of the polymer b. T» Tg of the polymer c. T=Tg of the polymer d. Discuss why don't we plot tensile stress strain for rubbery flow region ? (Tg: Glass transition temperature) e. Plot and shear stress vs shear rate of a Newtonian and non-Newtonian fluids and give examples of each.Determine the maximum allowable spacing s of the nails used to hold the top flange to the web. The beam is constructed from three boards. (Figure 1) Express your answer to three significant figures and include appropriate units. It is subjected to a shear of V = 4.1 kip. Each nail can support a shear force of 620 lb. HA ? St = |1.911 in Submit Previous Answers Request Answer Figure 1 of 1 Part B 1.5 in. Determine the maximum allowable spacing s of the nails used to hold the bottom flange to the web. o10 in Express your answer to three significant figures and include appropriate units. 12 in HẢ V 1 in Sh = 2.275 in A 1.5 in. 6 in.
- The following creep data were taken for an alumlinum alloy at 400°C and a constant stress of 25 MPa. Determine the steady-state creep rate. Creep Data 0.40 0.35 0.30 0.25 므 0.20 0.15 0.10 0.05 0.00 10 15 20 25 30 Time (min) StrainA poiseuille flow experiment was carried out to measure the viscosity of air at 298 K. The sample was allowed to flow through a 100 cm tube of internal diameter 1 mm. The high pressure end was at 865 torr and the low pressure end was at 760 torr. The volume was measured at the latter pressure. In 59 seconds a volume of 90.2 cm^3 passed through the tube. What is the viscosity in cp of air at this temperatureA 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.
- A 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.Viscometer is used to measure the viscosity of a series of dilute solutions of a polymer in toluene at 30°C. (1) Intrinsic viscosity is the most useful of the various viscosity designations because it can be related to molecular weight by the Mark-Houwink-Sakurada equation, [n] = KM. Calculate the viscosity average molecular weight for this polymer by using the data given in Table 2. Given that the Mark-Houwink constant, K is 12 x 10-5 dl/g and a = 0.71. 0.505 0.595 0.804 Concentration 0 (g/dL) Flow time (s) 67.94 0.402 107.70 121.05 Table 2 132.77 161.39 1.207 227.84Answer questions in reference to the figure below (use Specimen 2 for calculations). *Note that in this diagram strain is expressed as a percentage, in which the strain value multiplied by 100. Stress [MPa] 700 650 600 550 500 450 400 350 300 250 200 150 100 50 Specimen 1 Specimen 2 - Specimen 3 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Strain [%] 1. Calculate the Elastic Modulus of this alloy. 2. Estimate the tensile strength. Explain the rationale behind your estimation. 3. Use the 0.002 strain offset method to determine the yield strength of this alloy. Draw this offset on the diagram so it is clear how you are determining the value.
- A cylinder sand filter of 1 m height and 30 cm radius is given. The filter is composed of sand particles of different size. The filter is initially filled with air and water is injected from the bottom very slowly at a rate of 0.008 m/hr. At that rate it took 10 hours for water to reach the top of the filter. Calculate the porosity of the sand filter.Please list the different kinds of strain energy.m=9 n=3