The effect of the stress riser is much more pronounced in a brittle material than a ductile material. Which of the following is not the correct explanation for this behavior?

Strain hardening occurs in ductile material, which increases the required stress for the flow of crack

Strain hardening does not occur in a brittle material, so it results in sudden propagation of the crack

Redistribution of stress does not occur in a brittle material

The toughness of brittle material is much more than ductile material

An elliptical hole in a plate as shown in the figure. The value σmax= σϴ = __________

\(\sigma\theta=\sigma(1+2\frac{a^2}{b^2})\)

\(\sigma\theta=\frac{\sigma}{2}(1+\frac{a^2}{r^2})-\frac{\sigma}{2}(1+3\frac{a^4}{r^4})cos2\theta\)

\(\sigma\theta=\frac{\sigma}{2}(1+3\frac{a^4}{r^4})cos2\theta\)

\(\sigma\theta=\sigma(1+2\frac{a}{b})\)

\(\sigma\theta=\sigma(1+2\frac{a^2}{b^2})\)

Explore topic-wise MCQs in Mechanical Metallurgy.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Metallurgy knowledge and support exam preparation. Choose a topic below to get started.

1.	The effect of the stress riser is much more pronounced in a brittle material than a ductile material. Which of the following is not the correct explanation for this behavior?
A.	Strain hardening occurs in ductile material, which increases the required stress for the flow of crack
B.	Strain hardening does not occur in a brittle material, so it results in sudden propagation of the crack
C.	Redistribution of stress does not occur in a brittle material
D.	The toughness of brittle material is much more than ductile material
Answer» E.

Discussion

2.	The following diagram shows a rectangular plate with a circular hole at the ends. The dimension of the plate is shown in the figure. If the ratio of r/h increase, the stress concentration factor Kt will ______________
A.	increase
B.	decrease
C.	remain constant
D.	cannot comment
Answer» C. remain constant

Discussion

3.	The following diagram shows a rectangular plate with a circular hole at the ends. The dimension of the plate is shown in the figure. If the ratio of b/r increase, the stress concentration factor Kt will __________
A.	increase
B.	decrease
C.	remain constant
D.	cannot comment
Answer» B. decrease

Discussion

4.	An elliptical hole in a plate as shown in the figure. The value σmax= σϴ = __________
A.	\(\sigma\theta=\frac{\sigma}{2}(1+\frac{a^2}{r^2})-\frac{\sigma}{2}(1+3\frac{a^4}{r^4})cos2\theta\)
B.	\(\sigma\theta=\frac{\sigma}{2}(1+3\frac{a^4}{r^4})cos2\theta\)
C.	\(\sigma\theta=\sigma(1+2\frac{a}{b})\)
D.	\(\sigma\theta=\sigma(1+2\frac{a^2}{b^2})\)
Answer» D. \(\sigma\theta=\sigma(1+2\frac{a^2}{b^2})\)

Discussion

5.	The value of stress concentration for circular hole in a plate subjected to uniform stress of σ is equal to ________
A.	1
B.	4
C.	3
D.	10
Answer» D. 10

Discussion

6.	A rectangular plate has circular hole in center as shown in the figure. There are 4 points located in the plate, find out the point where localized stress will be maximum.
A.	1
B.	2
C.	3
D.	4
Answer» B. 2

Discussion

7.	In addition to producing the stress concentration, a notch also creates a localized condition of the biaxial or triaxial stress.
A.	True
B.	False
Answer» B. False

Discussion

8.	The stress concentration is generally expressed by a theoretical stress-concentration factor kt. Generally, Kt is described as the ratio of _________________
A.	σmax / σmin
B.	σmin/ σmax
C.	σmax/σnominal
D.	σnominal/σmax
Answer» D. σnominal/σmax

Discussion

9.	A geometrical discontinuity in a body, such as a hole or a notch result in nonuniform distribution of stress at the vicinity of discontinuity. At the region near the discontinuity, the local stress will be higher than normal stress distribution.
A.	True
B.	False
Answer» B. False

Discussion

Explore topic-wise MCQs in Mechanical Metallurgy.

The effect of the stress riser is much more pronounced in a brittle material than a ductile material. Which of the following is not the correct explanation for this behavior?

The following diagram shows a rectangular plate with a circular hole at the ends. The dimension of the plate is shown in the figure. If the ratio of r/h increase, the stress concentration factor Kt will ______________

The following diagram shows a rectangular plate with a circular hole at the ends. The dimension of the plate is shown in the figure. If the ratio of b/r increase, the stress concentration factor Kt will __________

An elliptical hole in a plate as shown in the figure. The value σmax= σϴ = __________

The value of stress concentration for circular hole in a plate subjected to uniform stress of σ is equal to ________

A rectangular plate has circular hole in center as shown in the figure. There are 4 points located in the plate, find out the point where localized stress will be maximum.

In addition to producing the stress concentration, a notch also creates a localized condition of the biaxial or triaxial stress.

The stress concentration is generally expressed by a theoretical stress-concentration factor kt. Generally, Kt is described as the ratio of _________________

A geometrical discontinuity in a body, such as a hole or a notch result in nonuniform distribution of stress at the vicinity of discontinuity. At the region near the discontinuity, the local stress will be higher than normal stress distribution.