Virtual Labs

1. Principal stresses are the normal stresses acting on planes where the shear stress is:

a: Maximum Explanation

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b: Equal to the applied load Explanation

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c: Zero Explanation

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d: Equal to the normal stress Explanation

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2. Which graphical method is commonly used to determine principal stresses and maximum shear stresses?

a: Mohr's Circle Explanation

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b: Rankine Cycle Explanation

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c: S-N Curve Explanation

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d: Stress-Strain Curve Explanation

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3. Principal stresses are always:

a: Shear stresses Explanation

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b: Normal stresses Explanation

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c: Torsional stresses Explanation

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d: Bearing stresses Explanation

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4. At the principal planes, the value of shear stress is:

a: Maximum Explanation

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b: Minimum but not zero Explanation

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c: Zero Explanation

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d: Equal to the average normal stress Explanation

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5. According to the Tresca yield criterion, yielding begins when:

a: Maximum principal stress reaches the yield stress Explanation

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b: Maximum shear stress reaches the shear yield strength Explanation

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c: Average stress becomes zero Explanation

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d: Normal stress equals shear stress Explanation

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6. The Von Mises yield criterion is based on:

a: Distortion energy Explanation

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b: Maximum normal stress Explanation

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c: Maximum strain Explanation

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d: Maximum bending moment Explanation

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7. A material is subjected to plane stresses of σₓ = 100 MPa, σᵧ = 0 MPa and τₓᵧ = 0 MPa. What are the principal stresses?

a: 100 MPa and 0 MPa Explanation

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b: 50 MPa and 50 MPa Explanation

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c: 100 MPa and 100 MPa Explanation

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d: 50 MPa and 0 MPa Explanation

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8. Two principal stresses at a point are σ₁ = 80 MPa and σ₂ = 20 MPa. What is the maximum shear stress?

a: 20 MPa Explanation

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b: 30 MPa Explanation

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c: 40 MPa Explanation

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d: 60 MPa Explanation

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9. Which yield criterion generally provides a more accurate prediction for ductile materials under multiaxial loading?

a: Rankine criterion Explanation

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b: Maximum principal strain criterion Explanation

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c: Tresca criterion Explanation

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d: Von Mises criterion Explanation

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Principal Stresses Experiment