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manufacturing process that unintentionally introduces cracks to the surface of a part was used to produce load-bearing components. The design requires that the component be able to withstand a stress of 450 MPa. The component failed catastrophically in service.
You are a failure analysis engineer who must determine whether the component failed due to an overload in service or flaws from the manufacturing process. The manufacturer claims that the components were polished to remove the cracks and inspected to ensure that no surface cracks were larger than 0.5 mm. The manufacturer believes the component failed due to operator error. It has been independently verified that the 5-cm diameter part was subjected to a tensile load of 1MN (106 N). The material from which the component is made has a fracture toughness of 75 MPa (m) ½ and an ultimate tensile strength of 600 MPa. Assume external cracks for which f =1.12.
a) Who is at fault for the component failure, the manufacturer or the operator?
b) In addition to the analysis that you presented in (a), what features might you look for on the fracture surfaces to support your conclusion?
The town needs a total of 2 mgd. The capacity of well 1 is 5 million gallons per day, and that of well 2 is 10 mgd. Using calculus (hint: calculus with substitution), determine the optimal amount of water that will be drawn from each well
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a 110 cubic centimeter volume of clay weighs 145 g in its undisturbed state. when the clay specimen is dried it weighs 110.5g. what is the natural water content of the clay, and what is the degree of saturation Assume Gs=2.70
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Set up a table showing curve elevations at the PVC, at the PVT, and at the half-station points along the curve. Compute the station and elevation of the curve turning point.
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