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Materials Science
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Materials Science

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Questions and Answers

Which of the following statements is true about stress concentration?

  • Stress concentration can only occur in materials with holes or notches
  • Stress concentration occurs when the flow lines move farther apart to accommodate changes in the material geometry
  • Stress concentration is not accounted for by stress concentration factors
  • Stress concentration is caused by a sudden packing together of the flow lines around a discontinuity in the material (correct)
  • What is a stress riser?

  • A factor used to scale down the stress concentration in the vicinity of a discontinuity
  • A feature in the material that causes the stress to spike up in the vicinity of it (correct)
  • A feature in the material that causes the stress to flow smoothly through it
  • A factor used to calculate the nominal stress in the area of a discontinuity
  • How is the actual stress in the vicinity of a discontinuity calculated?

  • By adding the nominal stress in that area to the stress concentration factor
  • By scaling down the nominal stress in that area
  • By scaling up the nominal stress in that area by the appropriate stress concentration factor (correct)
  • By dividing the nominal stress in that area by the appropriate stress concentration factor
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