Mechanical Metallurgy Mock Test 6

10%

Question 1 of 10

1. The plane-strain value of critical stress intensity factor K^Ic is independent of the specimen thickness and describes the fracture toughness of the durable material. Here, in the K^Ic the I represents _____

mode of fracture

number of stress state

the magnitude of fracture toughness

number of strain state

Question 1 of 10

Question 2 of 10

2. The geometry of the plastic zone in front of a crack tip is shown in the following figure.
$mechanical-metallurgy-questions-answers-fracture-mechanics-kic-plane-stress-toughness-testing-q1$

False

True

Question 2 of 10

Question 3 of 10

3. In the case of plane stress, the relationship between the fracture toughness and crack extension force is given as _______ (where K is the fracture toughness, δ is the crack extension force, and E is the young’s modulus).

K=δ/E

K=(δE)²

K²=δE

K=δE

Question 3 of 10

Question 4 of 10

4. The amplitude ratio is defined as the ___________

σ_mean/σ_amplitude

σ_max-σ_min

σ_max/σ_min

σ_amplitude/σ_mean

Question 4 of 10

Question 5 of 10

5. The following figure represents the hysteresis loop for cycle softening of the material.

False

True

Question 5 of 10

Question 6 of 10

6. The following picture is the correct representation of the Goodman diagram. The point X in the given curve indicates the ______________

failure point

minimum stress point

ultimate tensile strength point

yield point

Question 6 of 10

Question 7 of 10

7. The J integral method is used for the _______________ materials.

high strength plastic materials

low strength ductile material

low strength brittle material

high strength brittle material

Question 7 of 10

Question 8 of 10

8. Which of the following does not play a role in fatigue failure?

Sample size

Temperature

Stress concentration

Corrosion

Question 8 of 10

Question 9 of 10

9. The mean stress is indicated by which point in this stress cycle?

Question 9 of 10

Question 10 of 10

10. According to the J-Integral, the fracture occurs when the J integral value reaches a critical value. The value of J is equal to____________

$\int(W dy-T ds)$

$\int(WT \frac{du}{dx} ds)$

$\int(W dy-T \frac{du}{dx} ds)$

$\int(W dy+T \frac{du}{dx} ds)$

Question 10 of 10