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The strain tensor Section 1

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The strain tensor. Section 1. Why do we need to know about elasticity?. Strain tensor for small deformations. How do we measure strain? Strain Gauges. From James T. Humprhies and Leslie P. Sheets, Industrial Electronics 4 th Ed. (Delmar, Albany NY, 1993). - PowerPoint PPT Presentation

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Page 1: The strain tensor

The strain tensor

Section 1

Page 2: The strain tensor

Why do we need to know about elasticity?

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Strain tensor for small deformations

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How do we measure strain?Strain Gauges

From James T. Humprhies and Leslie P. Sheets, Industrial Electronics 4th Ed.

(Delmar, Albany NY, 1993)

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Edward Simmons,former Caltech ME graduate student, invented the bonded wire resistance strain gage in 1936.

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Dr. Simmons, creator of a billion dollar

industry,first adopted by aerospace,

helped win WWII

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Range of Gauge Factor Values

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This is the trace of the strain tensor. In general the trace of the strain tensor gives area change in 2-D and volume change in 3-D The principal axes

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