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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?
Calculate deformation of the truncated equilateral triangular steel pyramid. The pyramid has the height h of 156mm truncated at the top by 2mm and the base side s of 127mm.
If a mass of 500kg is placed centrally on the top face of the buoy, find the maximum height of its centre of gravity above the bottom of the buoy so that the buoy may remain in stable equilibrium.
What is the percent change from 10m to the surface. Use absolute pressure and assume standard atmospheric conditions. Would the answer change with a different system of units.
Inital Cost=$40,000, Estimated Salvage Value (@ year 5)=18,000, Actual Salvage Value (@ yr.5)=20,000, Depreciation: Straight-Line (No half -year convention), Life=5yrs, Annual Benefit=10,000, and tax rate=34%.
Annual rainfall over the watershed is 36 inches and the annual runoff from the catchment is 12 inches. Evaporation from the reservoir averages 40 inches per year. The municipal water demand equals 100 million gallons per day
A horizontal het of water at 5 degrees celsius strikes a block and is deflected upward 30 degrees. The mass flow rate of the water is 1.75 kg/s. The mass of the block is 1.30 kg. The jet has a cross sectional area of 10 cm^2.
As part of the procurement or contracting department of this federal agency, you need to demonstrate your understanding of the different project delivery methods and contract types available to the agency.
For each of the following, draw both the p - v and the T - v diagrams showing the location of the state and write below the diagrams a) what the condition the H2O is in (eg. Superheated vapor), b) which table in the back of the text provides the e..
Consider a DVD To protect sensitive information within the storage medium, a vwery thin film of reactive polymer is embedded within the polycarbonate at a distance of d= 0.5 mm from the surface.
The "supersoaker" water gun can shoot more than 30 ft in the horizontal direction. Estimate the minimum pressure, , needed in the chamber in order to accomplish this. List all assumptions and show all calculations.
The partial pressure of the gasses in a 22,414-L volume of air at STP are: oxygen, 21,224 kPa; nitrogen, 79,119 kPa; argon, 0.946 kPa; and carbondioxide, 0.036 kPa. Determine the gram molecular weight of air.
The velocity of a body is given by v(t) = 2t+t3. The body starts from rest at time t = 0 at position s(0) = (2,-10). What are the position and acceleration of the body as functions of time At what time, t, does the body cross the X-axis
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