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In the compliance calibration of an edge-cracked fracture toughness testpiece of an aluminum alloy, it was observed that a load of 100 kN produced a displacement between the loading pins of 0.3 mm when the crack length was 24.5 mm, and 0.3025 mm when the crack length was 25.5 mm. The fracture load of an identical testpiece containing a crack of length 25.0 mm was 158 kN. Calculate the critical value of the mechanical potential energy release rate Q at fracture and hence the plane strain fracture toughness Kic of the alloy. All testpieces were 25 mm thick. For the alloy, Young's modulus, E = 70 GPa and Poisson's ratio, v = 0.3.
An embankment for a highway 30 m wide and 1.5 m in compacted thickness is to be constructed from a sandy soil trucked from a borrow pit. The water content, w
Write an expression for the tension T in the rod as a function of θ and calculate T for the position θ = π/2
Assemble samples of as many different species of wood as you can Þ nd. Learn how to tell the different species apart by color, odor, grain Þ gure, ray structure, relative hardness, and so on.
Design a 4-bitregister with two control inputs S1 and S0, four data inputs I3,I2,I1, I0, and four dataoutputs Q3, Q2, Q1, Q0. S1S0=00 means maintain the present value, S1S0=01means
The current vertical stress at a point in a saturated clay is 181 kPa. This soil is to be covered with a 2.5m thick fill that will have a unit weight of 19.3 kN/ m^3. What will be the value of the vertical
The plus sight and minus sight distances were kept approximately equal. Readings (in feet) listed in the order taken are 5.06 (+s) on BM tree, 8.99 (-s) and 7.33 (+s) on TPI, 2.52 (-s) and 4.85 (+s) on BM X, 3.61(-s) and 5.52 (+s) on TP2, and 7.60..
Assume that the service station must fill refill the tank with 4.00 m^3 of gasoline once a week.Draw a mass balance diagram and estimate the annual loss of gasoline vapor (in kg/y) for the splash fill method
What return period must an engineer use in the design of a bridge opening for 50% risk that flooding will occur at least once in two successive years
What are the differences between plainsawn and quartersawn lumber?
The Caterpillar D6R Series 3 and D8R tractors are rated, respectively, at flywheel horsepowers (fwhp) 0f 185 and 305. The “A,” “S,” and “SU” blade widths (length) for the D6R are S, 16 ft, 9 in.; A, 17 ft, 1 in.; and for the
A piston-cylinder device contains 0.85 kg R-134a at 263K. The piston is free to move and has a mass of 12 kg and diameter of 25 cm. The atmospheric pressure is 98 kPa. Heat is added to the cylinder until the R-134 temperature = 10 o C.
The undeformed length of the spring is l. Knowing that the collar is released from rest at x = and neglecting friction between the collar and the horizontal rod, determine the magnitude of the velocity of the collar as it passes through point C.
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