midterm2 - ME 211030 INTRODUCTION TO SOLID MECHANICS...

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ME 211–030 INTRODUCTION TO SOLID MECHANICS Bluebook II — Practice Examination Attempt all questions MULTIPLE CHOICE QUESTIONS 1. (2 points). The initially square element with sides of length 1 deforms to OBCD as shown in Figure 1. (- 0.03, 1.02) (0.96, 0.98) (0.99, - 0.04) x y B C D O Figure 1 The shear strain γ xy is A B C D E F γ xy = –0.07 –0.04 –0.01 0.01 0.03 0.07 check one only
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(1 point). Figure 2 shows a rigid bar ABC that is pinned at A and supported by two steel wires BD , CE . Is this system determinate or indeterminate? A Determinate B Indeterminate A B C D E F 200 150 all dimensions in mm. Figure 2 3. (1 point). If the two wires BD , CE in Figure 2 are identical and the force F is gradually increased, which wire will fail ±rst? The wire that fails ±rst is BD CE check one only 4. (1 point). If the normal strain ² x = 0, does it necessarily follow that the corresponding normal stress σ x = 0? A
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midterm2 - ME 211030 INTRODUCTION TO SOLID MECHANICS...

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