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Which one of the following pairs is NOT correctly matched?
- a)Visco-elastic material : Small plastic zone
- b)Strain hardening material : Stiffening effect felt at some stage
- c)Orthotropic material : Different properties in three perpendi-cular directions
- d)Isotropic material : Same physical properties in all directions at a point
Correct answer is option 'A'. Can you explain this answer?
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Which one of the following pairs is NOT correctly matched?a)Visco-elas...
Answer: a)Visco-elastic material : Small plastic zone
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Explanation: Visco-elastic material exhibit a mixture of creep and elastic after effects at room temperature. Thus their behaviour is time-dependent. Materials with different properties in different directions are called anisotropic. Orthotropic material is a special case of an anisotropic material in three mutually perpendicular directions. However, these are symmetric about any axis.
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Which one of the following pairs is NOT correctly matched?a)Visco-elas...
Visco-elastic material: Small plastic zone
Explanation:
Visco-elastic materials are those materials which exhibit both viscous and elastic behavior. The behavior of these materials depends on the rate of loading, time and temperature. The correct statement about visco-elastic material is that it has a small plastic zone. Plastic deformation occurs when the material is subjected to a load beyond its yield strength. However, visco-elastic materials do not have a well-defined yield point, and they exhibit a gradual change in deformation behavior. Therefore, the statement that visco-elastic materials have a small plastic zone is incorrect.
The other options are correctly matched and can be explained as follows:
- Strain hardening material: Stiffening effect felt at some stage
When a material is subjected to plastic deformation, its stress-strain curve shifts to the right, causing the material to become stiffer. This phenomenon is known as strain hardening. Therefore, the statement that a strain hardening material exhibits a stiffening effect at some stage is correct.
- Orthotropic material: Different properties in three perpendicular directions
Orthotropic materials are those materials which have different mechanical properties in three perpendicular directions. For example, wood has different properties along the longitudinal, radial, and tangential directions. Therefore, the statement that an orthotropic material has different properties in three perpendicular directions is correct.
- Isotropic material: Same physical properties in all directions at a point
Isotropic materials are those materials which have the same physical properties in all directions at a point. Examples of isotropic materials are glass, aluminum, and rubber. Therefore, the statement that an isotropic material has the same physical properties in all directions at a point is correct.
Conclusion:
Hence, the correct answer is option A, which is not correctly matched. The other options are correctly matched, and they correctly describe the behavior of the respective materials.
Explanation:
Visco-elastic materials are those materials which exhibit both viscous and elastic behavior. The behavior of these materials depends on the rate of loading, time and temperature. The correct statement about visco-elastic material is that it has a small plastic zone. Plastic deformation occurs when the material is subjected to a load beyond its yield strength. However, visco-elastic materials do not have a well-defined yield point, and they exhibit a gradual change in deformation behavior. Therefore, the statement that visco-elastic materials have a small plastic zone is incorrect.
The other options are correctly matched and can be explained as follows:
- Strain hardening material: Stiffening effect felt at some stage
When a material is subjected to plastic deformation, its stress-strain curve shifts to the right, causing the material to become stiffer. This phenomenon is known as strain hardening. Therefore, the statement that a strain hardening material exhibits a stiffening effect at some stage is correct.
- Orthotropic material: Different properties in three perpendicular directions
Orthotropic materials are those materials which have different mechanical properties in three perpendicular directions. For example, wood has different properties along the longitudinal, radial, and tangential directions. Therefore, the statement that an orthotropic material has different properties in three perpendicular directions is correct.
- Isotropic material: Same physical properties in all directions at a point
Isotropic materials are those materials which have the same physical properties in all directions at a point. Examples of isotropic materials are glass, aluminum, and rubber. Therefore, the statement that an isotropic material has the same physical properties in all directions at a point is correct.
Conclusion:
Hence, the correct answer is option A, which is not correctly matched. The other options are correctly matched, and they correctly describe the behavior of the respective materials.
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Which one of the following pairs is NOT correctly matched?a)Visco-elastic material : Small plastic zoneb)Strain hardening material : Stiffening effect felt at some stagec)Orthotropic material : Different properties in three perpendi-cular directionsd)Isotropic material : Same physical properties in all directions at a pointCorrect answer is option 'A'. Can you explain this answer?
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Which one of the following pairs is NOT correctly matched?a)Visco-elastic material : Small plastic zoneb)Strain hardening material : Stiffening effect felt at some stagec)Orthotropic material : Different properties in three perpendi-cular directionsd)Isotropic material : Same physical properties in all directions at a pointCorrect answer is option 'A'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following pairs is NOT correctly matched?a)Visco-elastic material : Small plastic zoneb)Strain hardening material : Stiffening effect felt at some stagec)Orthotropic material : Different properties in three perpendi-cular directionsd)Isotropic material : Same physical properties in all directions at a pointCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following pairs is NOT correctly matched?a)Visco-elastic material : Small plastic zoneb)Strain hardening material : Stiffening effect felt at some stagec)Orthotropic material : Different properties in three perpendi-cular directionsd)Isotropic material : Same physical properties in all directions at a pointCorrect answer is option 'A'. Can you explain this answer?.
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