(25 pts. total) You have been asked to assess a new magnesium alloy for use as t
ID: 1766861 • Letter: #
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(25 pts. total) You have been asked to assess a new magnesium alloy for use as the skin of an airplane fuselage. The advantage of the alloy is that is has a density that is 1.8 g/cm3 as compare to an aluminum alloy with 2.7 g/cm3. The material has a yield strength 275 MPa and a fracture toughness of Klc = 28 MPaVm. The skin thickness will be 4.0 mm thick. In service, it is subjected to a cyclic stress from 150 to 200 MPa with each cycle occurring from one flight of the aircraft (take-off to landing). (15 pts.) Considering that the material constants consist of m being 4 and A being 1 x 105 MPa4m-1, how many flights could a plane with this material as its fuselage endure before an edge crack with a starting length of 10 um grows long enough to cause catastrophic failure? a. Assume that the geometric factor equals 1.3 for this problem (5 pts.) Would you recommend this material for use as the fuselage skin? Why or why not? b. c. (5 pts.) Aluminum alloy 2014-T6 is used in some aerospace applications. What is the fatigue limit for this alloy based on the graph below? 80 500 70 60 400 0 1045 steel 50 300 40 a 2014-T6 aluminum alloy 200 30 20 10 0 100 Red brass 0 103 104 105 106 107 10 109 1010 Cycles to failure, NExplanation / Answer
In generally we use aluminium as a material for manufacturing of aircraft because it has less density, high strength. It has also good thermal conductivity. Steel is an alloy of iron and carbon and can be three times stronger and heavier than aluminium.
Titanium and its alloys are commonly used in the construction of aircraft due to its high strength properties, high temperature resistance and high corrosion resistance compared to steel and aluminium. The most common composite material used is the fibre glass that is made up of glass fiber, as the base material and resin matrix. The advantage of using composite material, however include high cost and immidiate repair are needed in case of damage.
Magnisium has been gaining popularity again due to new development regarding its corrosion and harmability properties and magnisium is a light weight but banned in aircraft constructions since it is easily catches fire. Now a days we are using nano adaptive hybride fiber materials (NAHF:20), It has good structure and thermal conductive. Once this material is incorporated into yarn products it will have the ability to produce in continuous sheets to desired size like other fabrics.
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