Warnick James Module4 Questions with Answers-Student.docx

# Warnick James Module4 Questions with Answers-Student.docx -...

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SFTY 335 – Module 4 1. Why are components made from steel or aluminum alloy used on aircraft? (up to 4 points) Steel is used in components that will receive high impact forces and need to withstand loads at high temperatures due to its high modulus of elasticity and its tendency to retain strength at high temperatures. Aluminum is used for its higher strength-to-weight ratio, corrosion resistance, high conductivity, and high strength in colder conditions. 2. For each of the following suggest a part on an aircraft that needs that particular material property: hardness, strength, elasticity, placidity, ductility, toughness, and brittleness. (up to 7 points – one point for each answer.) Hardness: Composite flight control surfaces Strength: Steel engine mounts Elasticity Steel landing gear Placidity: Copper wiring Ductility: Steel flap joints Toughness: Aluminum wing joints Brittleness: Aluminum outer skin 3. Explain in why exceeding the yield point causes permeant stain, and how that is measured and calculated. (up to 5 points) The yield point of a material is the point on the stress-strain curve where plastic deformation begins, and the crystalline structure begins to break down. In tensile testing stress is applied to the material and gauges measure for material deformation. The resulting force is measured in Giga Pascals (GPa). 4. What do the temperatures on 1 & 2 of the iron– Carbon phase diagram indicate, shown in the presentation? What is the difference between 3 & 5? Four (4) represents the melted region; will the composition of the alloy be the same?
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• Summer '14
• Tensile strength

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