5. Structures and Materials

Structural Testing — Quiz

Test your understanding of structural testing with 5 practice questions.

Practice Questions

Question 1

Which non-destructive testing method is most effective for detecting surface-breaking cracks in metallic structures during static load testing?

Question 2

In structural testing instrumentation, which calibration technique involves introducing a known resistance into the strain gauge bridge circuit to verify the measurement system’s response?

Question 3

What is the primary advantage of using impact hammer excitation over continuous sinusoidal excitation in modal testing of aircraft structures?

Question 4

A cantilever beam assembly used in modal analysis has a measured first-mode frequency $f_{1}=50\,\mathrm{Hz}$ and an equivalent modal mass $m=2\,\mathrm{kg}$. What is the corresponding modal stiffness $k$? Show your calculation.

Question 5

Using Basquin’s equation $N=A\,\sigma^{-m}$ with $A=10^{12}$ and $m=3$, what is the expected fatigue life $N$ at a stress amplitude $\sigma=100\,\mathrm{MPa}$? Show your calculation.