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A specimen of a 4340 steel alloy having a plane A specimen of a 4340 steel alloy having a plane strain fracture toughness of 45MPavm (41ksivin) is exposed to a stress of 1000MPa (145,000psi). Will this specimen experience fracture if it is known that the largest surface crack is 0.75 mm (0.03 in.) long? Why […]

A specimen 750 mm (30 in.) long of an S-590 A specimen 750 mm (30 in.) long of an S-590 alloy (Figure) is to be exposed to a tensile stress of 80MPa (11,600psi) at 815(C (1500(F). Determine its elongation after 5000 h. Assume that the total of both instantaneous and primary creep elongations is 1.5 […]

Find the instantaneous time sinusoidal functions corresponding Find the instantaneous time sinusoidal functions corresponding to the following phasors: (a)V – 5ejπ/3 (V), (b)V – j6e jπ/4(V), (c)I – (6 + j8) (A), (d)I – – 3 + j2 (A), (e)I – j (A), (f)I – 2e jπ/6(A). Is this the question you were looking for? […]

A single crystal of aluminum is oriented for a tensile A single crystal of aluminum is oriented for a tensile test such that its slip plane normal makes an angle of 28.1( with the tensile axis. Three possible slip directions make angles of 62.4(, 72.0(, and 81.1( with the same tensile axis. (a) Which of […]

A solution heat-treated 2014 aluminum alloy is to be precipitati A solution heat-treated 2014 aluminum alloy is to be precipitation hardened to have a minimum tensile strength of 450 MPa (65,250psi) and a ductility of at least 15%EL. Specify a practical precipitation heat treatment in terms of temperature and time that would give these mechanical […]

A random poly(isobutylene-isoprene) copolymer has a number-avera A random poly(isobutylene-isoprene) copolymer has a number-average molecular weight of 200,000 g/mol and a degree of polymerization of 3000. Compute the fraction of isobutylene and isoprene repeat units in this copolymer. Is this the question you were looking for? If so, place your order here to get started!

A sheet of steel 1.5 mm thick has nitrogen atmospheres A sheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200(C and is permitted to achieve a steady-state diffusion condition. The diffusion coefficient for nitrogen in steel at this temperature is 6 ( 10-11 m2/s, and the diffusion flux is found […]

Calculate the number-average molecular weight of a random nitril Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.30; assume that this concentration corresponds to a degree of polymerization of 2000. Is this the question you were looking for? If so, place your […]

Compare the temperature dependence of the conductivity for metal Compare the temperature dependence of the conductivity for metals and intrinsic semiconductors. Briefly explain the difference in behavior. Is this the question you were looking for? If so, place your order here to get started!

Compare the manner in which the aggregate particles become bonde Compare the manner in which the aggregate particles become bonded together in clay-based mixtures during firing and in cements during setting. Is this the question you were looking for? If so, place your order here to get started!