Piezo Ceramics – How to define strain

When an object such as a rod is stretched to a new length (L + delta L) from its original length (L), the ratio (Δ L)/(L) is said to be the strain in the rod. For the convenience of visualization the dimensionless measure of stretching or compression is called as “microns per meter (microstrain)”, “millimeters per meter”, or “inches per inch”,

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