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What is strain?

strain
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What is strain?

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When a solid object like a rod of length (L) is stretched to a new length (L + delta L), the strain in the rod is defined as the ratio (Δ L)/(L). This is a dimensionless measure of stretching or compression often stated as “inches per inch”, “millimeters per meter”, or “microns per meter (microstrain)” for convenience of visualization.

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