Stress Strain Curves and Material Failure

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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. Two wires have the same length and cross-sectional area and carry equal tensile forces. Wire A stretches by 1.0 mm and Wire B stretches by 3.5 mm. Which statement is correct?

   • A. Wire B has a higher Young's modulus than Wire A
   • B. Wire A has a higher Young's modulus than Wire B
   • C. Both wires have the same Young's modulus because the force is equal
   • D. Wire B has a higher stress because it stretches more

2. 2. On a stress-strain curve for a ductile metal, which of these lists the points in the correct order from zero load to failure?

   • A. Elastic limit, limit of proportionality, yield point, breaking point
   • B. Limit of proportionality, yield point, elastic limit, breaking point
   • C. Limit of proportionality, elastic limit, yield point, breaking point
   • D. Yield point, limit of proportionality, elastic limit, breaking point

3. 3. Which observation shows that a metal specimen is brittle rather than ductile?

   • A. It shows a clear yield plateau and then a narrow neck
   • B. It breaks abruptly with almost no plastic deformation and a flat, clean fracture surface
   • C. It has a cup-and-cone fracture surface
   • D. It stretches a lot permanently before it breaks

4. 4. A crane cable is made from steel with a yield strength of 400 MPa. The safety regulations require a factor of safety of 5. Calculate the maximum allowable working stress in the cable.

   Type your answer (in MPa) in the lesson.

5. 5. What name is given to the localised thinning of a ductile specimen's cross-section that happens after the ultimate tensile strength is reached?

   Type your answer in the lesson.

More in Mechanical Properties of Materials

• ▸Elasticity and Hooke's Law
• ▸Understanding Tensile Stress
• ▸Understanding Tensile Strain
• ▸Modulus of Elasticity and Young's Modulus
• ▸Industrial Applications of Material Properties
• ▸Practical Material Testing
• ▸Concept of Temperature and Temperature Scales
• ▸Liquid Expansion and Mechanical Thermometers

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