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- Question : 1QP - State three examples of a static load application and three examples of a dynamic load application.
- Question : 2QP - A material has the stress
- Question : 3QP - A tensile load of 50,000 lb is applied to a metal bar with a 0.6 in. * 0.6 in cross section and a gage length of 2 in. Under this load the bar elastically deforms so that the gage length increases to 2.007 in. and the cross section decreases to 0.599 in. * 0.599 in. 0 Determine the modulus of elasticity and Poisson
- Question : 4QP - A tensile load of 190 kN is applied to a round metal bar with a diameter of 16 mm and a gage length of 50 mm. Under this load the bar elastically deforms so that the gage length increases to 50.1349 mm and the diameter decreases to 15.99 mm. Determine the modulus of elasticity and Poisson
- Question : 5QP - A cylinder with a 6.0 in. diameter and 12.0 in. length is put under a compressive load of 150 kips. The modulus of elasticity for this specimen is 8,000 ksi and Poisson
- Question : 6QP - A metal rod with 0.5 inch diameter is subjected to 2000 lb tensile load. Calculate the resulting diameter of the rod after loading. Assume that the modulus of elasticity is 10,000,000 psi, Poisson
- Question : 7QP - A rectangular block of aluminum 30 mm * 60 mm * 90 mm is placed in a pressure chamber and subjected to a pressure of 100 MPa. If the modulus of elasticity is 70 GPa and Poisson
- Question : 8QP - A plastic cube with a 4 in. * 4 in. * 4 in. is placed in a pressure chamber and subjected to a pressure of 15,000 psi. If the modulus of elasticity is 1000 ksi and Poisson
- Question : 9QP - A material has a stress
- Question : 10QP - On a graph, show the stress
- Question : 11QP - The rectangular block shown in Figure P1.11 is subjected to tension within the elastic range. The increase in the length of a is 2 * 10-3 in. and the contraction of b 3.25 * 10-4 in. is If the original lengths of a and b were 2 in. and 1 in., respectively, what is Poisson
- Question : 12QP - The rectangular metal block shown in Figure P1.11 is subjected to tension within the elastic range. The increase in the length of a is 0.05 mm and the Poisson
- Question : 13QP - A cylindrical rod with a length of 380 mm and a diameter of 10 mm is to be subjected to a tensile load. The rod must not experience plastic deformation or an increase in length of more than 0.9 mm when a load of 24.5 kN is applied. Which of the four materials listed in the accompanying table are possible candidates? Justify your answer.
- Question : 14QP - The stress
- Question : 15QP - A tension test performed on a metal specimen to fracture produced the stress
- Question : 16QP - Use Problem 1.15 to graphically determine the following: a. Modulus of resilience b. Toughness Hint: The toughness 1ut2 can be determined by calculating the area under the stress
- Question : 17QP - Figure P1.17 shows the stress
- Question : 18QP - An alloy has a yield strength of 41 ksi, a tensile strength of 57 ksi, and an elastic modulus of 16 * 106 psi. A cylindrical specimen of this alloy 0.5 in. in diameter and 10 inches long is stressed in tension and found to elongate 0.3 inches. On the basis of the information given, is it possible to compute the magnitude of the load that is necessary to produce this change in length? If so, calculate the load. If not, explain why.
- Question : 19QP - A brass alloy has a yield strength of 280 MPa, a tensile strength of 390 MPa, and an elastic modulus of 105 GPa. A cylindrical specimen of this alloy 12.7 mm in diameter and 250 mm long is stressed in tension and found to elongate 7.6 mm. On the basis of the information given, is it possible to compute the magnitude of the load that is necessary to produce this change in length? If so, calculate the load. If not, explain why.
- Question : 20QP - Figure P1.20 shows (i) elastic
- Question : 21QP - An elastoplastic material with strain hardening has the stress
- Question : 22QP - Define the following material behavior and provide one example of each. Support your answer with graphs. a. Elastic b. Plastic c. Viscoelastic
- Question : 23QP - An asphalt concrete cylindrical specimen with a 4-inch diameter and a 6-inch height is subjected to an axial compressive static load of 150 lb for 1 hour, after which the load is removed. The test was performed at a temperature of 100
- Question : 24QP - Draw a sketch of the Maxwell model and label all components. Draw a graph showing displacement versus time when the model is subjected to a constant force for a time period t and then released. Comment on why the model responds this way.
- Question : 25QP - What are the differences between
- Question : 26QP - State four failure modes of materials. Describe typical examples of each mode.
- Question : 27QP - A metal rod having a diameter of 10 mm is subjected to a repeated tensile load. The material of the rod has a tensile strength of 290 MPa and a fatigue failure behavior as shown in Figure 1.16. How many load repetitions can be applied to this rod before it fails if the magnitude of the load is (a) 5 kN, and (b) 11 kN?
- Question : 28QP - What is the factor of safety? On what basis is its value selected?
- Question : 29QP - State the typical values of the specific gravity of three materials commonly used in construction.
- Question : 30QP - Define the coefficient of thermal expansion. What is the relation between the linear and the volumetric coefficients of thermal expansion?
- Question : 31QP - A steel rod, which is free to move, has a length of 200 mm and diameter of 20 mm at a temperature of 15
- Question : 32QP - In Problem 1.31, if the rod is snugly fitted against two immovable nonconducting walls at a temperature of 15
- Question : 33QP - A 4-meter-long steel plate with a rectangular cross section 110 mm * 50 mm2 is resting on a frictionless surface under the sun. The plate temperature is measured to be at 40
- Question : 34QP - Estimate the tensile strength required to prevent cracking in a concrete-like material that is cast into a bar, 50 in. long, and is fully restrained at each end against axial movement. The concrete is initially cast and cured at a temperature of 100
- Question : 35QP - State two examples in which corrosion plays an important role in selecting the material to be used in a structure.
- Question : 36QP - Briefly discuss the variability of construction materials. Define the terms accuracy and precision when tests on materials are performed.
- Question : 37QP - In order to evaluate the properties of a material, samples are taken and tested. What are the two most important factors that must be satisfied when the sample is collected? Show how these factors can be satisfied.
- Question : 38QP - A contractor claims that the mean compressive strength for a concrete mix is 32.4 MPa and that it has a standard deviation of 2.8 MPa. If you break 16 cylinders and obtain a mean compressive strength of 30.3 MPa, would you believe the contractor
- Question : 39QP - A contractor claims that the mean compressive strength for a concrete mix is 5,000 psi and that it has a standard deviation of 400 psi. If you break 20 cylinders and obtain a mean compressive strength of 4,800 psi, would you believe the contractor
- Question : 40QP - In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 5,000 psi. The following compressive strength data were collected. a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.
- Question : 41QP - During construction of the surface layer of asphalt pavement, two samples were taken every day to measure the asphalt content in the mix to ensure that it is within the specification limits. The target value was set at 5.5 percent with a tolerance of ;0.4 percent. The following asphalt content data were collected: a. Calculate the mean, standard deviation, and the coefficient of variation of the data. b. Using a spreadsheet program, create a control chart for these data showing the target value and the upper and lower specification limits. Are the asphalt content data within the specification limits? Comment on any trend and possible reasons.
- Question : 42QP - Linear variable differential transformers (LVDTs) are used in some lab experiments. What is their function? Show a sketch showing the main components of an LVDT and discuss the theory behind its use.
- Question : 43QP - Briefly discuss the concept behind each of the following measuring devices: a. LVDT b. strain gauge c. proving ring d. load cell
- Question : 44QP - Referring to the dial gauge shown in Figure P1.44, determine a. Accuracy b. Sensitivity c. Range, given that the small pointer moves one division for each full turn of the large pointer d. Which of the preceding items can be improved through calibration? e. For measuring devices, which of the following two statements is always true? (i) Accuracy cannot exceed sensitivity (ii) Sensitivity cannot exceed accuracy
- Question : 45QP - Measurements should be reported to the nearest 1000, 100, 10, 1, 0.1, 0.01, 0.001 units, etc., depending on their variability and intended use. Using your best judgment, how should the following measurements be reported? a. Deformation of a steel specimen during the tension test (in.) b. Tensile strength of steel (psi) c. Modulus of elasticity of aluminum (MPa) d. Weight of aggregate in a sieve analysis test (grams) e. Compressive strength of portland cement concrete (psi) f. Moisture content in a concrete masonry unit (percent) g. Asphalt content in hot-mix asphalt (percent) h. Specific gravity of wood i. Distance between New York City and Los Angeles (miles) j. Dimensions of a computer microchip (mm)
- Question : 46QP - During calibration of an LVDT, the data shown in the accompanying table were obtained. Using a spreadsheet program, plot the relation between the micrometer reading and voltage. What is the linear range of the LVDT? Determine the calibration factor of the LVDT by obtaining the best fit line of the data within the linear range.
- Question : 47QP - During calibration of an LVDT, the data shown in the accompanying table were obtained. Using a spreadsheet program, plot the relation between the micrometer reading and voltage. What is the linear range of the LVDT? Determine the calibration factor of the LVDT by obtaining the best fit line of the data within the linear range.
- Question : 48QP - Using the Internet, research the LEED rating system for new construction. What are the prerequisite requirements for LEED certification? What are the requirements for LEED certification of wood? Which LEED credit area can be awarded the greatest number of points?

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