This set of Forming Questions and Answers for Aptitude test focuses on “Relationship between Tensile and Shear Yield Stress”.
1. Tensile strength of a material is the ability of a material to resist the lateral load without failure.
a) True
b) False
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Explanation: Tensile strength of any material is defined as the ability of a material to resist axial or centric load without failure, it is mainly determined by performing tensile test. When equal and opposite forces are applied to the material simultaneously that axially pulls the material, which further causes elongation of the material by decrease in its diameter.
2. The behaviour of the material is generally determined by its mechanical properties.
a) True
b) False
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Explanation: The behaviour of the material is generally determined by its mechanical properties, when a material is subjected to different loading conditions like tensile load, compressive load etc. then properties like young’s modulus, various strengths, toughness, ductility etc. are determined, which are very important in design and manufacturing.
3. The necking phenomenon of material can be observed in tensile test as well as in compression test.
a) True
b) False
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Explanation: When an axial load is applied to the material, the material first elongates, then necking occurs and the fracture is produced. The necking phenomenon is only occurring in the tensile test due to the elongation of material, a neck like structure is formed. Its behaviour generally depends on the material used for the test. Necking does not take place in brittle materials.
4. The induced stress in the material and the young’s modulus, both are the properties of the material.
a) True
b) False
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Explanation: When a material is subjected to any load then the stress is induced in the material which is not a material property, it basically depends on the load applied and the cross-sectional area of the material. And young’s modulus is a material property which indicates stiffness of the material and it is different for different materials.
5. When material subjected to load then elongation becomes more faster beyond the yield point.
a) True
b) False
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Explanation: Beyond the yield point, as the load increases, elongation of material proceeds at a faster rate than before. This part of stress strain curve is called as hardening region. When the load reaches a maximum value, the engineering stress at this point is called as the tensile strength or ultimate tensile strength of the material.
6. Necking is a localized elongation through which the load carrying capacity of material increases beyond its tensile strength.
a) True
b) False
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Explanation: In the stress-strain curve, beyond the tensile strength, the load carrying capacity reduces and the test material goes through a localized elongation called necking. There is no any constant strain in this region and the elongation occurs in one small segment of specimen. The stress measured just before the failure is known as the fracture stress.
7. The amount of strain that the material sustains before failure is a property which is called as ductility of the material.
a) True
b) False
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Explanation: When a material is subjected to a load, then the amount of strain that the material sustains before failure is an important property which is called as ductility of the material. This property is very useful in manufacturing of machine products which works more dynamically than statically. The ductility is generally measured in terms of its area reduction.
8. In the computation of engineering stress, the actual or instantaneous cross-sectional area is used.
a) True
b) False
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Explanation: The original cross sectional area is used in the computation of engineering stresses. But in computation of true stresses, the instantaneous cross-sectional area is used. Because of the length and cross-sectional area both changes at every instant during loading of material. The instantaneous load divided by instantaneous cross-sectional area is called true stress.
9. The relationship between the shear stress-strain is similar to the flow curve for plasticity of material.
a) True
b) False
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Explanation: Shear stress basically involves an application of load parallel to the surface of material in the opposite direction. The relationship between the shear stress-strain is similar to the flow curve for the plasticity of material. The applied load always increases as the increase in its strain hardening; then the material becomes much stronger and harder.
10. The brittle material directly fractures without yielding when it reaches the ultimate strength material.
a) True
b) False
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Explanation: The behaviour of the material is completely defined by its stiffness. Such material directly fractures without yielding when it reaches ultimate strength material. These materials are called as brittle materials. Examples of brittle material are ceramics, cast iron, etc. These materials are not suitable for forming operation, where permanent plastic deformation is required to get the final product.
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