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Manufacturing Engineering

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The total number of scales used in the Rockwell hardness test is?

Discuss

To accommodate a wide range of materials with a wide range of strength, there are 15 different Rockwell test scales, each having a specified major load and indenter geometry.

The Rockwell hardness test uses 15 different scales, each with a specific major load and indenter geometry, to measure the hardness of materials. The Rockwell hardness test provides a quick and easy method for determining the hardness of a material, making it a widely used hardness testing method in many industries.

In which of the following test specimen is in the form of a cantilever beam?

Discuss

Izod test specimen is in the form of a cantilever beam.

Detailed Explanation

The Izod test is most commonly used to evaluate the relative toughness or impact toughness of materials and as such is often used in quality control applications where it is a fast and economical test. It is used more as a comparative test rather than a definitive test.

Both Charpy and Izod impact testing are popular methods of determining the impact strength, or toughness, of a material.

Izod test is like the Charpy test, but the Izod geometry consists of a cantilever beam with the notch located on the same side as the impact point.

In which of the following test specimen is in the form of the simply supported beam?

Discuss
  • The Charpy impact test is performed to evaluate the resistance of plastics to breakage by flexural shock according to the standard test method.
  • It indicates the amount of energy needed to break standard test specimens under specific conditions of the specimen, mounting, notching, and pendulum velocity at impact.
  • The Charpy test specimen is in the form of the simply supported beam. In the Charpy test, a supported beam specimen is used.

Which of the following hardness test uses steel ball as an indenter?

Discuss

Brinell hardness test:- The method of Brinell testing consists of forcing a hardened steel ball, under a predetermined pressure, into the test material.

The Brinell hardness number is obtained by dividing the pressure in kilograms spherical surface of the impression, which is expressed in square millimeters.

Steel ball is used as an indentor in the Brinell hardness test.

Property by virtue of which material can absorb strain energy without plastic deformation is called ________

Discuss

Resilience is the strain energy absorbed by material without undergoing plastic deformation.

Strain energy stored in a specimen when strained within the elastic limit is known as Resilience. The maximum energy stored at the elastic limit is known as Proof Resilience.

The resilience of the material is the amount of energy the material can absorb and still return to its original state.

Material having same identical values of property in all directions can be termed as _________

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Isotropic materials have identical material properties in all directions at every given point. This means that when a specific load is applied at any point in the x, y, or z-axis, isotropic materials will exhibit the same strength, stress, strain, young's modulus, and hardness.

Material having same identical values of property in all directions can be termed as _________

Discuss

Isotropic materials have identical material properties in all directions at every given point. This means that when a specific load is applied at any point in the x, y, or z-axis, isotropic materials will exhibit the same strength, stress, strain, young's modulus, and hardness.

Permanent deformation of material with respect to time due to constant load and variable temperature is termed as _______

Discuss

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to move slowly or deform permanently under the influence of persistent mechanical stresses.

Creep is a time and temperature-dependent phenomenon. With the passage of time and other environmental conditions, material may lead to fracture points.

Resistance developed by surface of any material is known as ____________

Discuss

Hardness is a surface property. Resistance developed by the surface of any material is known as hardness.

Hardness is defined as a material's ability to resist permanent indentation (that is plastic deformation). Typically, the harder the material, the better it resists wear or deformation.

The term hardness, thus, also refers to the local surface stiffness of a material or its resistance to scratching, abrasion, or cutting.

The property of a material to resist any elastic deformation is termed as _______

Discuss

Stiffness relates to how a component bends under load while still returning to its original shape once the load is removed.

The ability of a material or shape to resist elastic deflection is termed as the stiffness of that material.

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