Exam #1 Study Guide (Material Selection Metals 341) Q, Exams of Nursing

Exam #1 Study Guide (Material Selection Metals 341) Q

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Exam #1 Study Guide (Material
Selection Metals 341) Questions with
Correct Answers
Give the steps that are included in designing a new product. - ANSWERS1. Design the
concept - begin to develop concepts based on the product's intended use.
2. Assembly drawings - Determine if design concepts work on paper and on the
computer.
3. Determine cost target - Have cost targets up front.
4. Determine failure modes - Figure out the ways that your product can fail. Ex. fatigue,
corrosion, impact, bending, compression, etc.
5. Determine the desired characteristics of the product - Ex. properties, availability,
economics, and business issues.
6. Determine manufacturing methods - The method of manufacturing is key in figuring
out the cost and materials selection for the specific application.
7. Create a candidate material selection matrix - What we did in class for the homework.
Ranking system of properties Ex. cost, machinability, and strength, yield strength, UTS,
etc.
8. Prototype manufacturing and testing - Create a prototype for the manufacturability
and also for the product attributes as well.
9. Final Selection - A final selection based on prototype results and any modifications
that need to be made.
What are the steps to a product redesign? - ANSWERS1. Determine the reason for
redesign - Improved performance, reduced cost, and government regulation.
2. Benchmark designs against other similar products - Compare and contrast the
differences of another successful product.
3. Follow steps 4-9 in the material selection algorithm for new designs.
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Exam #1 Study Guide (Material

Selection Metals 341) Questions with

Correct Answers

Give the steps that are included in designing a new product. - ANSWERS1. Design the concept - begin to develop concepts based on the product's intended use.

  1. Assembly drawings - Determine if design concepts work on paper and on the computer.
  2. Determine cost target - Have cost targets up front.
  3. Determine failure modes - Figure out the ways that your product can fail. Ex. fatigue, corrosion, impact, bending, compression, etc.
  4. Determine the desired characteristics of the product - Ex. properties, availability, economics, and business issues.
  5. Determine manufacturing methods - The method of manufacturing is key in figuring out the cost and materials selection for the specific application.
  6. Create a candidate material selection matrix - What we did in class for the homework. Ranking system of properties Ex. cost, machinability, and strength, yield strength, UTS, etc.
  7. Prototype manufacturing and testing - Create a prototype for the manufacturability and also for the product attributes as well.
  8. Final Selection - A final selection based on prototype results and any modifications that need to be made. What are the steps to a product redesign? - ANSWERS1. Determine the reason for redesign - Improved performance, reduced cost, and government regulation.
  9. Benchmark designs against other similar products - Compare and contrast the differences of another successful product.
  10. Follow steps 4-9 in the material selection algorithm for new designs.

What is the relationship between torsional strength and tensile strength? - ANSWERSTorsional strength is half of the tensile strength. What are rules of thumb for material properties? - ANSWERSUltimate tensile strength - 500X Brinnell hardness Ultimate torsional strength - 1/2 the UTS and 250X Brinell hardness. With a tensile test, why does the machine pull apart the metal at a constant rate? - ANSWERSIn order to have a constant rate of strain and accurate results. Where does a material perform plastic and elastic deformation? - ANSWERSPlastic deformation - Anywhere AFTER the Yield strength. Elastic deformation - Anywhere BEFORE the yield strength. How do you measure the modulus of elasticity? - ANSWERSFind the slope of the curve. How do you determine toughness on a Stress/Strain curve? - ANSWERSThe area under the curve. Describe the process to S.S. strengthen a metal. - ANSWERS1. Melt the base material to its solutionizing temperature.

  1. Add the alloying element which is also melted. (Make sure it is soluble in the host element). The addition of alloying aids in the blocking of dislocation motion.
  2. Let it cool (Preferably faster than the critical cooling rate). What are the steps to precipitation harden steel? - ANSWERS1. Heat the material so that the solute is dissolved in a high solubility phase at high temperature. (solutionize)
  3. Quench the material to trap the solute in the now lower temperature lower solubility phase.
  4. Age - Heat the material adequately to cause solute atoms to coalesce and form precipitates. What is the only way to make a metal stronger? - ANSWERSBottom line - Add more carbon. What are the steps to work harden metal? - ANSWERS1. Heat the metal below the recrystallization temperature.

What are the advantages of cold finished over hot finished? - ANSWERSCloser size tolerance Better surface finish Better mechanical properties Better machinability What are the disadvantages of cold finished over hot finished? - ANSWERSHigher cost Loss of strength above the recrystallization temp Distortion during machining More anisotropy Lower ductility How are the important material properties to weight reduction measured? - ANSWERSTensile testing What are typical failure modes in weight reduction applications? - ANSWERS1. Deflection - Controlled by the material's modulus of elasticity.

  1. Yielding - Permanent deformation can result in loss of function.
    1. Bucking - This can occur when tubes or columns are subjected to compressive or torsional loading.
  2. Fracture - Controlled by the material's UTS. What are common metals used specifically for weight reduction? - ANSWERSAluminum, Titanium, and Magnesium Out of Aluminum, Titanium, and Magnesium, what is the increasing order of density? - ANSWERS1. Magnesium
  3. Aluminum
  4. Titanium What is the price of aluminum in high volume? - ANSWERS$1.50 - $3.00 per pound What is the melting point of Aluminum? - ANSWERS660 degrees C