Chapter 4

1. What kind of testing system is shown here?

• Uniaxial fatigue testing

• 3-point bending testing

• Ultrasonic fatigue testing

• Tensile and compression testing

2. Which emitted signal is used to investigate the topography of a sample by SEM?

• Auger electrons

• Characteristic X-rays

• Backscattered electrons

• Secondary electrons

3. Which type of sensor is used to measure the strain in this experimental setup?

• Digital image correlation

• Extensometer

• Thermocouple

• Strain gauge (DMS)

4. Which statement regarding the measurement of electrical resistance in fatigue tests is true? The specific electrical resistance is a function of…

• Only the change in dislocation density

• Only the change in temperature

• The deformation induced change of the microstructure

5. Which loading type is present for the hysteresis shown?

• Elastic loading

• Elastic-plastic loading

• Plastic loading

6. What is the key difference of a TEM compared to a SEM? Collection of…

• Backscattered electrons

• Secondary electrons

• Transmitted electrons

7. Which pairs of values are needed to determine a cyclic stress-strain-curve (CSS)?

• Maximum stress and plastic strain amplitude

• Stress amplitude and plastic strain amplitude

• Stress amplitude and total mean strain

• Mean stress and plastic strain amplitude

8. Which pairs of values are used to determine a cyclic stress-strain-curve (CSS) when there is no saturation state?

• At N = Nf

• At N = 1

• At N = 1,000

• At N = Nf/2