### Private: Physics of Structural Mechanics

Certification Exams

# Theory Quiz

#### Total number of Questions - 45

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Understanding the Physics of Structural Mechanics ITC

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1 / 45

Select the two characteristics that strain measures should have in common.

2 / 45

Which analysis would we perform to study the stresses developed in a smartphone that is dropped from a certain height?

3 / 45

Which of the following cases can be studied with solid mechanics? Choose the best two options.

4 / 45

Which statement best defines strain?

5 / 45

Mode Participation factor and effective mass measure _____. Select the best option to complete the sentence.

6 / 45

Stresses will develop in a structure only when _____. Select the best option to finish this sentence.

7 / 45

Which of the following equations defines 1D engineering strain?

8 / 45

Hertzian contact refers to frictionless contact between two bodies. A Hertzian contact between a rigid sphere and a flat elastic surface is considered to be nonlinear due to _____. Select the best TWO options.

9 / 45

Which of the following analysis types are done on frequency domain? Choose two best options.

10 / 45

Which of the following simulations must be done with flexible, rather than rigid, bodies? Choose two best options.

11 / 45

Which statement is true about a stress tensor? Choose two best options.

12 / 45

In which of these applications is it safe to ignore inertial effects?

13 / 45

When a material point is in equilibrium, how many unique terms are in its 3 x 3 strain tensor?

14 / 45

Select the three types of structural nonlinearities:

15 / 45

Which statements concerning modal analysis results are correct? Select two best options.

16 / 45

Which of these quantities is a dynamic property of a structure?

17 / 45

Which of the following statements are correct for boundary conditions and loads in a mechanical simulation? Choose the best option.

18 / 45

What formula is used for calculating inertial forces?

19 / 45

Which of the following assumption holds true for a Modal Analysis?

20 / 45

Why does large deformation introduce nonlinearity in the model?

21 / 45

In designing a crank shaft, one must consider the time-history of displacements due to _____. Select the best option to complete the sentence.

22 / 45

If von Mises stress is zero, which statement is true? Choose the best option.

23 / 45

Which of these properties dissipates energy from a system? Select the best option.

24 / 45

Consider a situation where there are two geometrically identical brackets, each made with a different grade of plastic that have different elastic moduli (stiffness). Both brackets are constrained and loaded in the same manner. Select two statements which are true, assuming linear response.

25 / 45

Volumetric expansion occurs when all shear strain components are zero and all normal strain components are equal to each other (i.e., $e_{xy}=e_{xz}=e_{yz}=0$ but $e_{xx}=e_{yy}=e_{zz}$). Select the correct statement.

26 / 45

Which of the following descriptions are correct for von Mises stress visualized in principal stress space? Choose three best options.

27 / 45

A dog bone tensile test of polyethylene illustrates which two types of nonlinearites?

28 / 45

How does one determine whether or not a sufficient number of modes have been extracted to characterize the dynamic response of a system? Select the best option.

29 / 45

Large strain formulation will always result in _____. Select the best option to complete the statement.

30 / 45

Which of the following makes a large strain calculation nonlinear?

31 / 45

When we place a dead weight on top of a viscoelastic material sample, what phenomenon do we expect to see?

32 / 45

What type of analysis is preferred for studying the stresses developed in an electronic componenet due to a drop from certain height?

33 / 45

Which of these NEED NOT be a linear dynamic analysis?

34 / 45

What is the definition of stress component $\sigma_{xy}$? Choose the best option.

35 / 45

Select the equation that best represents a structural nonlinear problem.

36 / 45

From the uniaxial tensile test, which of the following is a strain that may represent failure for a component?

37 / 45

There are two cases of principal stresses: case 1 has $s_1$ = 20 MPa, $s_2$ = 0, $s_3$ = 0 while case 2 has $s_1$ = 40 MPa, $s_2$ = 40 MPa, $s_3$ = 20 MPa. Which of the following statements are correct? Choose two best options.

38 / 45

Which of the following statements are correct about principal stresses? Choose three best options.

39 / 45

Which expression best characterizes the formula for a deformation gradient?

40 / 45

Among other things, consideration of large deformations accounts for the effect of the change in the shape of a body. Select three items that may change due to large deformation which can also cause the response to become significantly nonlinear.

41 / 45

A natural frequency of zero Hz indicates that _____. Select the best option to complete the sentence.

42 / 45

Consider the case where we want to determine the maximum lateral deformation of a suspension bridge when subjected to oscillating wind loads at a given frequency. Which analysis type would be most appropriate for this situation?

43 / 45

A "free-free" modal analysis references a situation where _____. Select the best option to complete the sentence.

44 / 45

Which results can be obtained from mechanical simulations of flexible bodies under applied loads? Choose three correct options.

45 / 45

Which analysis type is used for studying the crashworthiness of an automobile?