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3 years ago

Describe what viscoelastic behavior means

1 answer:

5 0

This refers to the mechanical properties of the materials tested by means of a stress stimulus or deformation. The mechanical behavior of a material will depend on its viscosity / elasticity characteristics. Depending on the response to mechanical stimulus, the material may be classified as elastic or viscous. For a perfectly elastic or Hookian solid the deformation is proportional to the applied stress. A viscous material obeys Newton's law, which states that stress and shear rate are related through an intrinsic characteristic that is viscosity.

However, there are materials that correspond to both properties. Polymers have an intermediate mechanical behavior to elastic and viscous, being called viscoelastic. The elastic and viscous contribution to the mechanical behavior of the polymer depends on the temperature and time scale of the experiment.

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2 years ago

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4 years ago

Cavitation usually occurs because:

IgorLugansk [536]

Answer:

B) the liquid accelerated to high velocities.

I hope this helps

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3 years ago

A total knee replacement experiences a spectrum of loading events, some rapid and some nearly steady state (but for a limited du

Gennadij [26K]

Answer: your question is quite vague hence i will just give you the general answer regarding your question

answer : Deborah number = time of relaxation / time of observation

Explanation:

Estimate of the duration of the possible loading events

to estimate the duration of the possible loading events will first determine the Deborah number as shown

Deborah number = time of relaxation / time of observation

lets assume; Time of observation = 1 and time of relaxation = 1 day

Deborah number is dimensionless and it is used to determine viscoelastic behavior of a material hence the viscoelastic response during observation time is proportional to Deborah number

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3 years ago

What is the basic molecular mechanism for polymer plasticity, and how does it differ from that of ductile crystalline metals?

sdas [7]

Answer:

In Crystalline metals or materials, plasticity is examined from the perspective of the motion of linear defects or dislocations within the polymer chains.

Explanation:

When a temperature range below and near the glass transition temperature is reached, there is warping or contortion of structureless or malformed polymers. This warping happens as the polymer chains move over one another.

Unlike elasticity when requires or enables an object to resume its original dimensions, ductility is the quality of an element or material to change form albeit permanently.

Cheers

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3 years ago