Materials Indices and Screening Limits Quiz
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Questions and Answers

What parameter can be maximized to optimize performance for all F and G in the given expression?

  • Material efficiency coefficient (correct)
  • Stiffness coefficient
  • Material index
  • Strength coefficient
  • In the context of selecting a material for a light, strong tie-rod, which constraint is mentioned in the text?

  • Determining stiffness
  • Minimizing mass (correct)
  • Maximizing length
  • Avoiding tensile force
  • What does the material efficiency coefficient f3(M) aim to maximize in the given scenario?

  • Performance
  • Stiffness
  • Strength (correct)
  • Material mass
  • Which performance parameter is crucial when selecting a material for a tie-rod to carry tensile load without yielding or breaking?

    <p>Strength-to-weight ratio</p> Signup and view all the answers

    What does the given equation suggest about the performance parameter P in terms of the material index?

    <p>P is inversely proportional to the material index</p> Signup and view all the answers

    Based on the text, what is essential for a tie-rod carrying tensile force: ____________.

    <p>Strong and lightweight material</p> Signup and view all the answers

    What is the objective when selecting material for a light, strong tie-rod?

    <p>Minimize mass</p> Signup and view all the answers

    In the context of selecting material for a tie-rod, what does the Material Index (M = σTS/ρ) signify?

    <p>Highest performance value</p> Signup and view all the answers

    In the scenario of a light, stiff beam, what does the Stiffness (S = F/δ) equation represent?

    <p>Beam's deflection under force</p> Signup and view all the answers

    What is the goal when minimizing mass for a light, stiff beam?

    <p>Maximize beam stiffness</p> Signup and view all the answers

    What factor does the Material Index (𝑴 = 𝝆 𝐶1 𝐸 𝐴2) help in evaluating?

    <p>Material's performance value</p> Signup and view all the answers

    When selecting material for a tie-rod, what should be aimed for in terms of the Material Index (M = σTS/ρ)?

    <p>Highest value possible</p> Signup and view all the answers

    What is the primary purpose of applying screening - property limits in material selection?

    <p>To eliminate materials that lack specific attributes required for the job.</p> Signup and view all the answers

    Which of the following is NOT a common property limit used during screening in material selection?

    <p>High tensile strength</p> Signup and view all the answers

    In what scenario can materials be simply ranked based on a single property?

    <p>When only one material property determines the performance.</p> Signup and view all the answers

    What is a Materials Index used for in material selection?

    <p>To rank materials based on multiple properties.</p> Signup and view all the answers

    Which of the following represents a correct specification for designing a structural component?

    <p>Functional requirements, geometry, and properties of the material</p> Signup and view all the answers

    Why is it important to consider a combination of material properties in complex applications like designing a light strong tie rod?

    <p>To achieve the desired performance requirements.</p> Signup and view all the answers

    What does the Material Index indicate about materials on the same guide line?

    <p>They have the same Material Index values</p> Signup and view all the answers

    Which materials are considered better based on their position relative to the guide lines for M = E^(1/3)/ρ?

    <p>Materials above the guide lines</p> Signup and view all the answers

    What is the criterion for materials to become candidates for the next stage of selection based on the index M = E^(1/3)/ρ > 2?

    <p>E &gt; 50 GPa</p> Signup and view all the answers

    In the context of Materials Selection for a Torsionally Stressed Cylindrical Shaft, what do the best materials have according to the text?

    <p>Low value of the expression m^3 / (2M)^(2/3)</p> Signup and view all the answers

    What is indicated by a solid cylindrical shaft that experiences an angle of twist 𝜙 in response to a twisting moment Mt?

    <p>High strength</p> Signup and view all the answers

    What does the Performance Index indicate about material performance?

    <p>The higher value, the better performance</p> Signup and view all the answers

    What does the Performance Index (P) indicate for materials on the same line in the materials selection chart?

    <p>Materials exhibit similar performance in terms of shear strength and density</p> Signup and view all the answers

    In the context of material selection, what does a Performance Index (P) value of 10 or higher typically signify?

    <p>High shear strength and low density</p> Signup and view all the answers

    What characteristics of materials does the materials selection chart in log-log space typically compare?

    <p>Shear strength and density</p> Signup and view all the answers

    Why is 4340 steel considered the most economical choice despite being the worst performer in terms of mass for sufficient strength?

    <p>Optimal balance between strength and mass</p> Signup and view all the answers

    What essential factor is considered in artificial hip joint replacement material selection regarding warm aqueous solutions and 1% NaCl?

    <p>Corrosion resistance</p> Signup and view all the answers

    When using the materials selection chart, what region is identified by the criteria of requiring P ≥ 10 and τf ≥ 300 MPa?

    <p>Search region shaded in green</p> Signup and view all the answers

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