Material Analysis Method with Ultrasonic Pulse-Echo Technique
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Questions and Answers

What test is typically used to determine the strength, elastic, and ductility properties of materials?

  • Impact test
  • Tensile test (correct)
  • Compression test
  • Flexural test

What is measured and recorded continuously during a tensile test?

  • Temperature
  • Change in length (strain) (correct)
  • Volume
  • Density

What is considered the ultimate tensile strength (su) during a tensile test?

  • Stress at the start of the test
  • Stress at the end of the test
  • Peak apparent stress on the test bar (correct)
  • Lowest stress point on the curve

How is stress related to the applied force during a tensile test?

<p>Stress is directly proportional to the applied force (A)</p> Signup and view all the answers

What happens to the stress–strain curve after the peak of the ultimate tensile strength?

<p>It drops off (A)</p> Signup and view all the answers

Which type of metal property is sometimes called the ultimate strength or simply the tensile strength?

<p>Ultimate tensile strength (D)</p> Signup and view all the answers

What method is used to measure Poisson’s ratio, Young’s modulus, and shear modulus of material?

<p>Ultrasonic pulse-echo technique (C)</p> Signup and view all the answers

Which testing fixtures are typically used for ASTM D790 and ISO 178 standards?

<p>3-point bending fixtures (D)</p> Signup and view all the answers

What does the Brinell hardness tester employ as the penetrator for steels?

<p>Hardened steel ball (A)</p> Signup and view all the answers

For which materials does the Rockwell hardness tester use a diamond penetrator?

<p>Heat-treated alloy steels (C)</p> Signup and view all the answers

What is machinability related to?

<p>Ease of machining (A)</p> Signup and view all the answers

What is toughness related to in materials?

<p>Impact resistance (A)</p> Signup and view all the answers

What is the modulus of elasticity?

<p>The slope of the straight-line portion of the stress–strain diagram (D)</p> Signup and view all the answers

What is Poisson’s ratio?

<p>The ratio of shortening strain to tensile strain (D)</p> Signup and view all the answers

What indicates a material's stiffness under shear loading?

<p>The ultimate strength in shear (D)</p> Signup and view all the answers

What is the measure of a material's ductility?

<p>The percent elongation (A)</p> Signup and view all the answers

What represents the resistance to shear deformation?

<p>The modulus of elasticity in shear (G) (D)</p> Signup and view all the answers

What is the apparent stress computed by when creating stress–strain diagrams?

<p>Dividing the load by the original cross-sectional area (B)</p> Signup and view all the answers

What property of a material is indicated by its ability to transfer heat?

<p>Thermal conductivity (C)</p> Signup and view all the answers

What is the measure of the change in length of a material subjected to a change in temperature?

<p>Coefficient of thermal expansion (A)</p> Signup and view all the answers

What phenomenon occurs when a material under stress experiences progressive elongation over time at high temperatures?

<p>Creep (D)</p> Signup and view all the answers

What is the property defined as the mass per unit volume of a material?

<p>Density (B)</p> Signup and view all the answers

Which property is used to indicate the weight per unit volume of a material?

<p>Density (B)</p> Signup and view all the answers

What property should be considered for metals operating at high temperatures?

<p>Creep (A)</p> Signup and view all the answers

At what temperature should creep be checked for a loaded metal member?

<p>$0.3Tm$ (B)</p> Signup and view all the answers

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