A material may fail if maximum principal stress exceeds the direct stress ?0 max

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Question
A material may fail if
Options
A. maximum principal stress exceeds the direct stress ?₀
B. maximum strain exceeds
C. maximum shear stress exceeds
D. total strain energy exceeds
E. all the above.

Correct Answer

all the above.

Theory of Structures problems

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3. Pick up the incorrect statement from the following : The torsional resistance of a shaft is directly proportional to
Options
A. modulus of rigidity
B. angle of twist
C. reciprocal of the length of the shaft
D. moment of inertia of the shaft section.

4. A material which obeys Hook's law, is subjected to direct stress ?₀. At its elastic limit, the following statement is true,
Options
A. Strain is equal to
B. Maximum shear stress =
C. Strain energy =
D. Shear strain energy =
E. All the above.

5. For determining the support reactions at A and B of a three hinged arch, points B and C are joined and produced to intersect the load line at D and a line parallel to the load line through A at D'. Distances AD, DD' and AD' when measured were 4 cm, 3 cm and 5 cm respectively. The angle between the reactions at A and B is
Options
A. 30�
B. 45�
C. 60�
D. 90�

6. A material is said to be perfectly elastic if
Options
A. it regains its original shape on removal of the load
B. It regains its original shape partially on removal of the load
C. it does not regain its original shape at all
D. none of these.

9. Pick up the correct statement from the following:
Options
A. The point of intersection of the bending axis with the cross section of the beam, is called shear centre
B. For I sections, the shear centre coincides with the centroid of the cross section of the beam
C. For channels, the shear centre does not concide its centroid
D. Bending loads should pass through the shear centre to avoid twisting
E. All the above.

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