# MBU - Physics of Structural Mechanics

MigrationCheck-Physics of Structural Mechanics

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Consider System A (“Steel”). For this tuning fork, a region of interest for the 6th mode is highlighted in a dotted red oval below. Select the correct statement below:

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Consider System A (“Steel”). For this tuning fork, a mode shape of interest is shown below. Select the correct statement below:

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Consider System B (“Copper”). For this tuning fork, the desired mode shape is shown below, where the tines (prongs) are vibrating in opposite motions toward/away each other. Select the correct statement below:

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For this tuning fork, the desired mode shape is shown below, where the tines (prongs) are vibrating in opposite motions toward/away each other. The desired frequency is 440 Hz. Select the correct statement below:

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What is the frequency of the tenth mode for the copper tuning fork in System B (“Copper”)? Pick the closest option.

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What is the frequency of the tenth mode for the steel tuning fork in System A (“Steel”)? Pick the closest option.

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Review the third and sixth modes in System B (“Copper”). Select the correct statement below:

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Compare the modes of System A (“Steel”) with System B (“Copper”). Select the correct statement below:

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Compare the first four modes of System A (“Steel”) with System B (“Copper”). Select the correct statement below:

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In System A (“Steel”), which direction does not have its dynamic response properly characterized with 10 modes?

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The Cumulative Mass Fraction reported for the highest extracted mode should _____. Select the best option to complete this sentence.

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For System B (“Copper”), select two statements which are correct concerning the system response in the global y-direction.

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For System A (“Steel”), select two statements which are correct concerning the system response in the global z-direction.

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What is the first frequency of vibration for the copper tuning fork in System B (“Copper”)?

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What is the first frequency of vibration for the steel tuning fork in System A (“Steel”)?

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Choose the BEST explanation for the influence of material density in the static analysis of the hanger.

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Choose the BEST reason for analyzing the hanger with a Static Structural System instead of Full Transient System.

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Choose the BEST reason for analyzing the hanger as a flexible body instead of a rigid body.

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Add a Maximum Shear Stress result object and review the result.  What is the value of the Maximum Shear Stress when half of the load is applied?  (Do not run such an analysis.)  Select the correct option.

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Consider the same model with the same loads and boundary conditions, but the arm is made of a stiffer plastic (higher elastic modulus).  (Do not run such an analysis.)

Select two correct statements below.

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Examine the Total Deformation result.  Based on the result history, how would the result compare if your ran with Large Deflection effects turned off?  (Do not run such an analysis.) Select the best option below.

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Consider the locations A through D in the figure below.  Where is the location of the maximum XZ shear stress component?

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Assume that this plastic will crack if the maximum principal stress exceeds 20 MPa.  Select the two correct statements.

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Consider the intermediate result at “Time = 0.1 [s]”.  Select the correct statement below.

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Why are Large Deflection effects used in this simulation?  Select the BEST option.

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Which component of stress contributes most to the equivalent stress?  Select the BEST option.

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What is the maximum equivalent stress experienced in the plastic arm?  Select the BEST option.

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Assume that the hinge connecting the arm to the sunglass frame can withstand a total moment of up to 80 Nmm.  Select TWO statements that are correct, based on the analysis results.  (Hint: use Moment Reaction probe.)

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Review the Reaction Force probe and notice that the reaction force history (Force vs Time) is linear.  Select the option below that is correct.

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Carefully review the model and Reaction Force probe results at the Fixed Support.  Why is the reaction force in the x-direction at “Base” not equal to 0.75 N (within a tolerance of 0.1%)?

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Let’s say that the maximum deformation of the arm is designated as deformation_current.  Consider a separate case where the force is doubled on the arm, and the maximum deformation of the arm is called deformation_twice.  (Do not run such an analysis.)  Assuming that the plastic material still responds in a linear elastic manner, which statement below is correct?

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What is the maximum magnitude of deformation in the y-direction under the applied load?  Select the BEST option below.

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What is the maximum deformation of the sunglass arm under the applied load?  Select the BEST option.

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Choose the BEST reason for turning Large Deflection ON

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Select TWO effects of turning Large Deflection ON for this analysis

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What will be the ratio of equivalent stress and equivalent strain at the following point in Aluminum Hanger?

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Consider a separate case where the aluminum hanger is suspended under standard earth gravity using only a steel spring of length 10mm and stiffness 0.28N/mm, without any applied Force or Fixed Support.  (Do not setup or solve such a simulation.)  What will be the strain generated in the spring?  Select the option that is closest to the answer.  (Hint: the mass of the hanger can be found in the Details view of the “Geometry” branch.)

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For System B (Structural Steel), the largest deformation in the x-direction occurs in which location?

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Consider the triangular portion of the clothes hanger, with positive x-direction being the “right” side and negative x-direction being the “left” side.  For System B (Structural Steel), the Total Deformation is _____.  Select the BEST answer.

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For System B (Steel), which of the following statements is correct concerning the center of the horizontal member of the clothes hanger?  Select 2 best options.  Note that the use of the term “significant” is relative to the magnitude of total equivalent strain in the model.

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For System A (Aluminum), Maximum Principal Elastic Strain is seen at which of the following locations?

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Compare the results between System A (Aluminum) and System B (Steel).  Which of the following statements is correct?  Select the BEST option.