Piezoelectric Transduction: Effects and Phenomena

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What happens when a voltage is applied between two plates sandwiching a piezoelectric medium?

The medium develops finite strain and induced polarization.

The medium does not experience any change in shape or induced polarization.

The medium is held to a constant shape, producing stress in the medium.

The medium is free to expand or contract, leading to stress and strain. (correct)

What happens if the piezoelectric medium is held to a constant shape when voltage is applied?

There is no induced polarization in the piezoelectric medium. (correct)

The medium develops finite strain and induced polarization.

The medium experiences a change in shape and induced polarization.

The medium does not experience any change in shape or induced polarization.

In piezoelectric actuation, when the medium is free to expand or contract, what is the stress (T) and strain (S) in the medium?

Stress (T) is zero, while there is finite strain (shape change). (correct)

Stress (T) is developed, while the strain (S) is zero.

Both stress (T) and strain (S) are zero.

Stress (T) and strain (S) both have finite values.

In piezoelectric actuation with a hypothetically bound medium so that it cannot expand or contract, what happens when voltage is applied?

There is no induced polarization in the piezoelectric medium. Signup and view all the answers

What happens when the electrodes of a piezoelectric medium are shorted with an external wire for sensing with applied force?

There is actual flow of electrons from one electrode to the other through the wire due to piezoelectric effect. Signup and view all the answers

What is the consequence of shorting the electrodes of a piezoelectric medium with an external wire during sensing with applied force?

Actual flow of electrons from one electrode to the other through the wire due to piezoelectric effect occurs. Signup and view all the answers

In piezoelectric sensing with open circuit for an infinitely resistive piezoelectric medium, what does the induced polarization produce?

An electrical field between the two electrodes Signup and view all the answers

What is the formula for the RC time constant (t) in the context of piezoelectric sensing?

$t=RC=(pL/A)(εA/L)$ Signup and view all the answers

What type of strain does a piezoelectric bimorph produce when used in extensional mode?

Very small strain Signup and view all the answers

How is the large displacement by bending obtained using a piezoelectric bimorph?

At the cost of reduced force or torque Signup and view all the answers

What happens to the polarization directions for the two substrates in a piezoelectric bimorph?

They are opposite to each other Signup and view all the answers

What is the role of a bimorph in producing a large bending displacement?

Opposite strains in the two layers force both of them to bend Signup and view all the answers

In piezoelectric sensing with short circuit, what does the induced polarization attract through the wire?

Electrons from one side to the other side Signup and view all the answers

What happens when a piezoelectric medium is infinitely resistive during sensing with applied force and open-circuited electrodes?

No free charge on the electrodes is present Signup and view all the answers

How do electrons move from one electrode to the other in a piezoelectric medium?

According to RC time constant Signup and view all the answers

What can be measured with a voltmeter in piezoelectric sensing with open circuit for an infinitely resistive piezoelectric medium?

The induced electrical field between the two electrodes Signup and view all the answers

Piezoelectric Transduction: Effects and Phenomena

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