What is the meaning of correctly applied force for piezoelectricity?

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Daniel Martinez Krahmer

My answer is based on my experience by working by Kistler piezoelectric dynamometers. This people recommend in your manual an maximum grade of excentricity between the load and your "applied possition" over the dynamometer surface.

Joydeep Sarkar

Generally it is said that it is better to apply the stress perpendicular to the surface of material. But as an idea, The stress should be felt by the maximum number of atoms because that will help in dislodging charges.